Fuel Injection System - Multi-Point Ford Econoline E150

DESCRIPTION

The Electronic Fuel injection (EFI) system is a pulsed time, speed density, fuel injection system. Fuel is metered into intake air stream, according to engine demand, through injectors mounted on a tuned intake manifold.

An on-board Electronic Engine Control (EEC-IV) module receives input from various engine sensors to compute required fuel flow necessary to maintain correct air/fuel ratio throughout engine RPM range.

FUEL DELIVERY

There are 2 fuel delivery systems in use. The first system consists of a low pressure, in-tank fuel pump, a fuel filter/reservoir, and a high pressure electric fuel pump. The second fuel delivery system consists of a single high pressure pump mounted in the fuel tank.

The fuel charging manifold assembly incorporates electrically actuated injectors directly above each engine intake port. When energized, injectors spray a metered quantity of fuel into intake air stream. The length of time that injectors are energized (injector "on time" or "pulse width") is controlled by EEC-IV module.

FUEL PRESSURE REGULATOR

The fuel pressure regulator is located in the fuel supply manifold downstream from injectors. Excess fuel not required by injectors passes through regulator and returns to fuel tank through a fuel return line.

The regulator is a diaphragm operated relief valve. One side of diaphragm senses fuel pressure and other side senses intake manifold vacuum. Nominal fuel pressure is established by an applied spring preload on diaphragm. Balancing one side of diaphragm with manifold pressure maintains a constant fuel pressure across injectors.

THROTTLE BODY ASSEMBLY

The throttle body assembly controls air flow to engine through a single or a double butterfly valve. An air by-pass valve controls both cold and warm engine idle speed. This air by-pass valve assembly is mounted to the upper intake manifold (2.9L engine), or throttle body on all other engines. The by-pass valve assembly is an electro-mechanical device controlled by EEC-IV module.

FUEL SUPPLY MANIFOLD ASSEMBLY

The fuel supply manifold delivers fuel at high pressure from vehicle fuel supply line to fuel injectors. Fuel supply manifold assembly has injector connectors and a mounting flange for the fuel pressure regulator. It also has mounting tabs which secure fuel manifold assembly to engine and provide injector retention. A fuel pressure relief valve is installed on fuel supply manifold assembly to release fuel system pressure.

FUEL INJECTORS

The injector nozzles meter and atomize fuel delivered to engine. Injectors are mounted in lower intake manifold and direct fuel just ahead of engine intake valves.

An electrical control signal from EEC-IV module activates injector solenoid, causing pintle to move upward off seat, allowing fuel to flow. Since injector flow orifice diameter is fixed and fuel pressure drop across injector tip is constant, fuel flow to engine is regulated by length of time solenoid remains energized.

INTAKE MANIFOLD

The intake manifold is a 2-piece (upper and lower) aluminum casting. Manifold provides mounting flanges for throttle body assembly, fuel supply manifold, accelerator control brackets, EGR valve and supply tube.

Vacuum taps are provided to support various engine accessories. Pockets for injectors are machined to prevent air and fuel leakage. Pockets in which injectors are mounted are placed to direct injector fuel spray immediately in front of each intake valve.

TROUBLE SHOOTING

Refer to appropriate article in COMPUTERIZED ENGINE CONTROLS section for specific testing procedures.

Verify all basic systems are operating properly before testing computerized components. Check cooling system, charging system, battery, all vacuum hoses and electrical connections, spark plugs and spark plug wires, etc.

Check fuel pump pressure. See FUEL PUMP PRESSURE WITH ENGINE RUNNING . For more information, see ELECTRIC FUEL PUMPS article in this section.

FUEL PUMP PRESSURE WITH ENGINE RUNNING

FUEL PRESSURE RELEASE

Note. Before disconnecting any fuel system component that may be under pressure, perform the following procedure.

Disconnect battery cable. Remove fuel tank cap. Remove cap from pressure relief valve located on fuel supply manifold and attach EFI Pressure Gauge (T80L-9974-B). Use pressure release button on gauge to bleed off pressure and fuel into an approved container.

Scheme 1

1. Depressurize fuel system. See «FUEL PRESSURE RELEASE»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point__fuel-pressure-release). Relief valve is located in upper right hand corner of engine compartment on fuel supply line. Disconnect fuel supply and return lines. See «PUSH-CONNECT FITTINGS»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point).
2. Disconnect wiring harness from injectors. Remove fuel supply manifold retaining bolts. Carefully disengage manifold and fuel injectors from engine. Remove manifold and injectors.
3. To install, lubricate new "O" rings with a light oil and install 2 on each injector (one per injector if injectors were not removed from fuel supply manifold). DO NOT use silicone grease.
4. Install fuel injector supply manifold and injectors in intake manifold, ensuring injectors are seated. Secure fuel manifold assembly with retaining bolts. Connect injector wiring harness. (Scheme 1)

Scheme 2

1. Remove air inlet tube from air cleaner to throttle body. Depressurize fuel system. See «FUEL PRESSURE RELEASE»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point__fuel-pressure-release). Relief valve is located on fuel supply line.
2. Remove upper intake manifold and throttle body assembly. See «UPPER INTAKE MANIFOLD & THROTTLE BODY ASSEMBLY»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point). Disconnect crossover fuel hose, fuel supply, and fuel return line from fuel supply manifold. See «PUSH-CONNECT FITTINGS»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point).
3. Remove fuel supply manifold retaining bolts. Carefully remove fuel supply manifold from lower intake manifold. The fuel injectors are retained in fuel supply manifold with clips.
4. Remove retainer clips and inspect for corrosion and damage. Remove injector(s) from fuel supply manifold and wipe cup with clean dry cloth.
5. To install, ensure injector caps and injector recesses are clean and free of contamination. Lightly grease recesses. Install 3 injectors on right side recess of intake manifold, and then 3 on left.
6. Position and press down firmly until attachment holes line up and install fasteners. To complete installation, reverse removal procedure. (Scheme 2)

Scheme 3

1. Remove air intake throttle body. See «AIR INTAKE THROTTLE BODY»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point). Depressurize fuel system. See «FUEL PRESSURE RELEASE»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point__fuel-pressure-release). Relief valve is located on fuel supply line. Disconnect fuel supply and return lines. See «PUSH-CONNECT FITTINGS»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point). Disconnect wiring harness at fuel injectors.
2. Disconnect vacuum hose from fuel pressure regulator. Remove fuel assembly manifold bolts (2 on each side). Carefully disengage fuel supply manifold from fuel injectors by lifting and gently rocking rail.
3. Remove injectors from fuel supply manifold by using a slight twisting/pulling motion. (Scheme 3) Place removed components in a clean container to avoid dirt or other contamination.
4. Lubricate new injector "O" rings with a light oil. DO NOT use silicone grease. Carefully install fuel supply manifold and injectors into lower manifold, one side at a time. To complete installation, reverse removal procedure.

Removal & Installation (4.9L)

1. Remove upper intake manifold assembly. See «UPPER INTAKE MANIFOLD & THROTTLE BODY ASSEMBLY»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) . Disconnect fuel supply and fuel return lines. See «PUSH-CONNECT FITTINGS»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) .
2. Remove injector cooling manifold from engine lifting eye attachment. Remove injector cooling manifold attaching nut from fuel rail stud. Remove injector cooling manifold.
3. Disconnect electrical lead from fuel manifold temperature switch. Disconnect vacuum hose from fuel pressure regulator. Remove strap surrounding fuel supply manifold, injector electrical harness, and main vacuum harness.
4. Remove 3 fuel supply manifold retaining studs. Carefully disengage fuel supply manifold from fuel injectors and remove manifold. To install, reverse removal procedure.

Scheme 4

Scheme 5

1. Loosen fuel tank cap. Disconnect electrical lead at fuel pump relay, inertia switch, or in-line high pressure fuel pump.
2. Crank engine for 10 seconds. If engine starts, crank engine an additional 5 seconds after engine stalls. Reconnect electrical lead that was disconnected in step 1). Disconnect negative battery cable.
3. Remove upper intake manifold and throttle body assembly. Disconnect fuel supply and return line connections at fuel supply manifold. See «PUSH-CONNECT FITTINGS»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) .
4. Remove fuel supply manifold retaining bolts. Carefully disengage fuel supply manifold from fuel injectors. To install, reverse removal procedure.

Removal (2.3L)

1. Remove throttle linkage shield. Disconnect throttle linkage, cruise control and kickdown cable. Unbolt accelerator cable and position out of way. Disconnect wire connectors throttle position sensor and air by-pass valve.
2. Disconnect air intake hose from throttle body. Disconnect PCV hoses. Disconnect water by-pass hose. Disconnect EGR tube by removing flange nut. Remove 5 upper intake manifold retaining bolts. Remove assembly.

Installation

Clean gasket surfaces, but do not allow gasket material to fall into intake manifold. To install, reverse removal procedure.

Removal (2.9L)

1. Disconnect electrical connectors at air by-pass valve, throttle position sensor, EGR sensor and Air Charge Temperature (ACT) sensor. Remove air inlet tube from air cleaner to throttle body.
2. Remove snow/ice shield to expose throttle linkage. Disconnect throttle cable from ball stud. Disconnect upper intake manifold vacuum connectors, both front and rear fittings including EGR valve, and vacuum line to fuel pressure regulator.
3. Disconnect PCV closure tube from under throttle body and disconnect PCV vacuum tube from under manifold. Remove canister purge line from fitting near power steering pump. Disconnect EGR tube from EGR valve by removing flange nut.
4. Loosen bolt retaining A/C line at upper rear of upper manifold and disengage retainer. Remove 6 upper intake manifold retaining bolts. Remove upper intake manifold and throttle body as an assembly.

1. Clean and inspect mounting faces of lower and upper intake manifolds. Position new gasket on lower intake mounting face. Use of alignment studs may be helpful.
2. Install upper intake manifold and throttle body assembly to lower manifold making sure gasket remains in place. Align EGR tube in valve. Install 6 upper intake manifold retaining bolts and tighten.
3. Engage A/C line retainer cup and tighten bolt. Tighten EGR tube, flare fitting, and lower retainer nut at exhaust manifold. Install canister purge line to fitting.
4. Connect PCV vacuum hose to bottom of upper manifold and PCV closure hose to throttle body. Connect vacuum lines to vacuum tree, EGR valve, and fuel pressure regulator.
5. Connect throttle cable to throttle body and install snow/ice shield. Connect electrical connector at air by-pass valve, throttle position sensor, EGR sensor, and ACT sensor.

Removal (3.0L)

1. Open hood and install protective covers. Ensure ignition switch is in the "OFF" position. Disconnect negative battery cable and secure out of way. Remove fuel cap to relieve fuel tank pressure.
2. Depressurize fuel system. See «FUEL PRESSURE RELEASE»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point__fuel-pressure-release) . Relief valve is located on fuel supply line. Disconnect fuel supply and return lines. See «PUSH-CONNECT FITTINGS»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) .
3. Disconnect wiring harness at fuel injectors. Disconnect wiring harness at throttle position sensor, air by-pass valve, and Air Charge Temperature (ACT) sensor.
4. Loosen clamps and remove engine air outlet tube between air cleaner and throttle body. If fuel supply manifold or if fuel injectors are being removed, remove snow shield by removing 3 plastic push-on retainers.
5. Disconnect and mark vacuum hoses at vacuum fittings on intake manifold. Disconnect and remove accelerator and cruise control cables from accelerator mounting bracket and throttle lever.
6. Remove 4 retaining bolts and 2 stud bolts. Lift air intake throttle body assembly from guide pins on lower intake assembly. Remove and discard gasket from lower intake manifold assembly.

Clean and oil manifold bolt threads. Install new manifold gasket. If injectors were removed, lubricate new injector "O" rings with a light oil. DO NOT use silicone grease. To complete installation, reverse removal procedure. (Scheme 6)

Scheme 6

Removal (4.9L)

1. Disconnect electrical leads at EGR valve position sensor, throttle position sensor, and air by-pass valve. Disconnect vacuum hoses at EGR valve, intake manifold vacuum tree, and fuel evaporative lines at throttle body.
2. Disconnect PCV hose from fitting located on side of intake manifold. (Scheme 7) Remove throttle linkage shield. Disconnect throttle linkage and cruise control cables. Disconnect accelerator cable from bracket and position cable away from engine.
3. Disconnect air inlet hoses from throttle body. Disconnect EGR tube from EGR valve and exhaust manifold. Remove EGR tube from engine. Remove thermactor (air injection) tube assembly from lower intake manifold.
4. Remove nut attaching thermactor by-pass valve bracket to lower intake manifold. On Vans, remove nut attaching transmission filler tube. Remove tube bracket from intake manifold stud.
5. On all models, remove 7 studs retaining upper intake manifold. Remove screw and washer attaching upper intake manifold support bracket to intake manifold. Remove upper intake manifold and throttle body as an assembly.

To install, reverse removal procedure. Use new gasket between upper and lower intake manifolds.

Scheme 7

Removal (5.0L, 5.8L & 7.5L)

1. Disconnect electrical leads at air by-pass valve, throttle position sensor, and EGR position sensor. Disconnect throttle linkage at pivot ball and AOD transmission linkage (5.0L) from throttle body.
2. Remove bolts securing bracket to intake manifold and position bracket with cables out of way. Remove vacuum hoses at upper intake manifold vacuum tee, EGR valve, and fuel pressure regulator.
3. Disconnect PCV system by removing hose from fitting on rear of upper intake manifold. Remove 2 canister purge lines from fitting on throttle body. Disconnect heater hoses from throttle body.
4. Disconnect EGR tube from EGR valve by turning flange nut. Remove upper intake manifold support bracket. Remove manifold retaining bolts. Remove upper intake manifold and throttle body as an assembly.

To install, reverse removal procedure. Use new gasket between upper and lower intake manifolds.

Removal & Installation (1/4" Straight Fittings)

1. Inspect visible internal portion of fitting for dirt accumulation. If dirty, fitting must be cleaned prior to removal. Slowly twist fitting on tube and then push and pull fitting until it moves freely on tube.
2. Align jaws of 6-inch channel lock pliers with openings in side of fitting case, and compress portion of clip that retains fitting in case. (Scheme 8) Pull fitting from tube. If clip has been properly disengaged, fitting can be pulled from tube with little effort.
3. Inspect fitting and tube for parts that may have been disconnected from fitting during removal. Install new replacement clip into fitting body by inserting one serrated edge in first, then push other edges inward, into place. A "click" will be heard when clip is properly installed.
4. Wipe end of tube with clean cloth. Push fitting straight onto tube end. When fitting is properly engaged, a "click" will be heard. Pull on tube to ensure that fitting is fully engaged.

Scheme 8

1. Inspect visible internal portion of fitting for dirt accumulation. If dirty, fitting must be cleaned prior to removal. Slowly twist fitting on tube and then push and pull fitting until it moves freely on tube.
2. Remove hairpin clip from fitting by bending shipping tab downward until it clears body. Next, separate 2 clip legs (about 1/8" each) to disengage body, and then push legs into fitting. (Scheme 8)
3. Lightly pull clip from triangle end, and work clip free of tube and fitting. Grasp fitting and hose assembly, and pull straight apart. Inspect fitting and tube for parts that may have been disconnected from fitting during removal.
4. To install, insert new clip into any 2 adjacent openings, with triangular portion pointing away from fitting opening. Install clip fully. Legs of clip must be locked on outside of body.
5. Wipe tube end with clean cloth. Ensure fitting is clear of dirt and obstructions. Push fitting straight onto tube end. When fitting is properly engaged, a "click" will be heard. Pull on tube to ensure that fitting is fully engaged.

Removal & Installation (3/8", 1/2" & 5/8" Spring Lock Coupling)

1. Relieve fuel system pressure. Place indicated spring lock coupler over coupling. See «SPRING LOCK COUPLER IDENTIFICATION»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point__removal-installation-38-12). Push coupler along tube, and into coupling, to release female fitting from garter spring.
2. Pull spring lock coupling apart. Remove coupler from disconnected spring lock coupling. (Scheme 9) Check for damaged garter spring and "O" rings. Wipe end of lines with clean cloth.
3. To install, place new "O" rings onto tube. Lubricate ends of lines with clean refrigerant oil. Locate White indicator ring (if equipped) which may have slipped down length of tube. Insert White indicator ring into cage of male fitting.
4. Push fitting together with a slight twisting motion. The White indicator ring should pop free of cage to indicate that male fitting is properly seated over flared end of female fitting.

SPRING LOCK COUPLER IDENTIFICATION

Scheme 9

Removal & Installation (2.3L)

1. Remove throttle linkage shield. Disconnect throttle linkage, cruise control and kickdown cable. Unbolt accelerator cable and position out of way. Disconnect wire connectors throttle position sensor and air by-pass valve.
2. Disconnect air intake hose from throttle body. Disconnect PCV hoses. Disconnect EGR tube by removing flange nut. Remove throttle body nuts/bolts.
3. Carefully separate throttle body from upper intake manifold. Clean gasket surfaces, but do not allow gasket material to fall into upper intake manifold. To install, reverse removal procedure.

Removal & Installation (2.9L)

1. Disconnect throttle position sensor connector. Remove air inlet duct. Remove snow/ice shield and disconnect throttle cable from ball stud.
2. Disconnect air by-pass hose, PCV closure hose, and canister purge hose from fittings beneath throttle body. Remove 4 screws and throttle body from upper intake manifold.
3. Remove and discard gasket between throttle body and upper intake manifold. Clean throttle body and upper intake manifold gasket surfaces. To install, reverse removal procedure.

1. Disconnect electrical leads at air by-pass valve and throttle position sensor. Disconnect throttle linkage shield, throttle linkage, and cruise control cable. Disconnect air inlet hoses from throttle body.
2. Disconnect fuel evaporative hoses from purge ports of throttle body. Remove 4 throttle body nuts. Carefully remove throttle body from upper intake manifold. Remove and discard gasket. To install, reverse removal procedure.

Removal & Installation (5.0L, 5.8L & 7.5L)

1. Disconnect electrical leads from throttle position sensor and air by-pass valve. On 7.5L engine, remove coolant heater lines from throttle body. On all engines, remove 4 throttle body bolts. Carefully separate throttle body from upper intake manifold.
2. Remove and discard gasket between throttle body and upper intake manifold. Clean gasket surface, but do not allow gasket material to fall into upper intake manifold. To install, reverse removal procedure.

Removal (2.3L, 3.0L & 4.9L)

1. Remove fuel tank cap and pressure relief valve cap. Install EFI Pressure Gauge (T80L-9974-B) at pressure relief valve to depressurize fuel system.
2. Remove vacuum hose at fuel pressure regulator. Loosen or remove fuel rail to intake manifold bolts for access to regulator housing screws. Remove screws from regulator housing. Remove pressure regulator, gasket, and "O" ring.

Lubricate "O" ring with a light oil. DO NOT use silicone grease. Ensure regulator and manifold gasket surfaces are clean and dry. Install regulator on manifold. Tighten retaining screws and fuel rail bolts. Install vacuum line.

1. Disconnect battery cable. Remove fuel tank cap. Remove cap from pressure relief valve located on fuel supply manifold and attach EFI Pressure Gauge (T80L-9974-B). Use pressure release button on gauge to bleed off pressure and fuel into an approved container.
2. Remove vacuum hose at pressure regulator. Remove screws from regulator housing. Remove pressure regulator, "O" ring, and washer.

1. Lubricate "O" ring with a light oil. DO NOT use silicone grease. Ensure regulator and manifold gasket surfaces are clean and dry. Install new washer and "O" ring on regulator.
2. Install regulator on manifold and tighten retaining screws. Install vacuum hose. Install fuel filler cap. Turn ignition on and off several times without starting engine to pressurize fuel system. Check fuel injection system for leaks at fuel rails, fittings, and injectors.

1. Open hood and install protective covers. Remove fuel tank cap. Locate and disconnect electrical lead at fuel pump relay, inertia switch, or in-line high pressure fuel pump.
2. Crank engine for 10 seconds. If engine starts, crank engine an additional 5 seconds after engine stalls. Reconnect electrical lead that was disconnected in step 1). Disconnect negative battery cable.
3. Remove vacuum hose from fuel pressure regulator. Remove Allen head screws from fuel pressure regulator housing. Remove fuel pressure regulator, gasket, and "O" ring.

Lubricate "O" ring with a light oil. DO NOT use silicone grease. Ensure regulator and manifold gasket surfaces are clean and dry. Install regulator on manifold. Tighten retaining screws. Install vacuum line.

Removal (2.3L & 3.0L)

1. Remove fuel tank cap and pressure relief valve cap. Install EFI Pressure Gauge (T80L-9974-B) at pressure relief valve to depressurize fuel system.
2. Disconnect wiring harness from each injector. Remove fuel supply manifold. See «FUEL SUPPLY MANIFOLD ASSEMBLY»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) . Remove injectors from fuel supply manifold by using a slight twisting/pulling motion.

Lubricate new injector "O" rings with a light oil. DO NOT use silicone grease. To complete installation, reverse removal procedure.

1. Open hood and install protective covers. Ensure ignition key is in the "OFF" position. Disconnect negative battery cable. Remove air inlet tube from air cleaner to throttle body.
2. Remove fuel tank cap and pressure relief valve cap. Install EFI Pressure Gauge (T80L-9974-B) at pressure relief valve to depressurize fuel system.
3. Remove upper intake manifold and throttle body assembly. See «UPPER INTAKE MANIFOLD ASSEMBLY & THROTTLE BODY ASSEMBLY»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) . Remove fuel supply manifold. See «FUEL SUPPLY MANIFOLD ASSEMBLY»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) .
4. Carefully remove wiring harness from injector(s) as required. Remove injector retaining clips(s). Remove injectors from fuel supply manifold by using a slight twisting/pulling motion.

Lubricate new injector "O" rings with a light oil. DO NOT use silicone grease. To complete installation, reverse removal procedure.

1. Ensure ignition key is in the "OFF" position. Disconnect battery cable. Remove fuel tank cap. Remove cap from pressure relief valve located on fuel supply manifold and attach EFI Pressure Gauge (T80L-9974-B). Use pressure release button on gauge to bleed off pressure and fuel into an approved container.
2. Remove upper intake manifold and throttle body assembly. See «UPPER INTAKE MANIFOLD & THROTTLE BODY ASSEMBLY»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) . Remove fuel supply manifold. See «FUEL SUPPLY MANIFOLD ASSEMBLY»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) .
3. Carefully remove wiring harness from injector(s) as required. Remove injectors from fuel supply manifold by using a slight twisting/pulling motion.

Lubricate new injector "O" rings with a light oil. DO NOT use silicone grease. To complete installation, reverse removal procedure.

1. Open hood and install protective covers. Remove fuel tank cap. Locate and disconnect electrical lead at fuel pump relay, inertia switch, or in-line high pressure fuel pump.
2. Crank engine for 10 seconds. If engine starts, crank engine an additional 5 seconds after engine stalls. Reconnect electrical lead that was disconnected in step 1). Disconnect negative battery cable.
3. Remove upper intake manifold assembly. See «UPPER INTAKE MANIFOLD ASSEMBLY & THROTTLE BODY ASSEMBLY»(/ford/econoline-e150/1987-1991/remont/testing-diagnostics/#fuel-injection-system-multi-point) . Carefully disconnect electrical lead(s) from injector(s). Remove injector(s) from fuel supply manifold by using a slight twisting/pulling motion.

Lubricate new injector "O" rings with a light oil. DO NOT use silicone grease. To complete installation, reverse removal procedure.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

See also:
• FUEL PUMP PRESSURE WITH ENGINE RUNNING
• FUEL PRESSURE RELEASE
• PUSH-CONNECT FITTINGS
• SPRING LOCK COUPLER IDENTIFICATION