VISUAL INSPECTION
Visually inspect all electrical wiring for chafed, stretched, cut or pinched wiring. Ensure electrical connectors fit tightly and are not corroded. Ensure vacuum hoses are properly routed and not pinched or cut. See VACUUM DIAGRAMS article in the ENGINE PERFORMANCE Section to verify routing and connections. Inspect air induction system for possible vacuum leaks.
Basic Diagnosis
Begin basic diagnosis of fuel system by determining fuel system pressure. If fuel pump fails to run, inspect power supply to main relay. If all power supplies are present (i.e., battery, ignition and starter switch during cranking), perform functional test of main relay. See WIRING DIAGRAMS and SYSTEM/COMPONENT TESTS articles in the ENGINE PERFORMANCE Section.
Scheme 55
- Disconnect negative battery cable. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-15814-S02763785572001010800000). Connect Fuel Pressure Gauge (07406-0040001 ) at 6-mm bolt. Reconnect negative battery cable. Start engine, and note fuel pressure. If vehicle will not start, check for spark. If spark is present and no fuel pressure is evident, inspect fuel pump main relay.
- Remove connector from fuel pump main relay. (Scheme 55) Using a test light, check power on Black/Yellow wire at fuel pump relay connector. If power is present, go to next step. If power does not exist, repair open wire between fuel pump main relay connector and fuse No. 2 on fuse box. Go to step 4).
- Connect jumper wire between Black/Yellow wire (B+) and Yellow wire. If fuel pump runs, go to next step. If fuel pump fails to run, see «SYSTEM/COMPONENT TESTS»(ref-15830) article in the ENGINE PERFORMANCE Section.
- Start engine. Disconnect vacuum hose from pressure regulator, and check for manifold vacuum. If vacuum is not present, check for restriction in vacuum port or hose. Plug vacuum hose and inspect fuel pressure gauge reading. Gauge reading should be within specification. See «REGULATED FUEL PRESSURE»(ref-15814-S27344590432001010800000) table. Pressure should drop slightly when vacuum hose is reconnected.
| Application | At Idle psi (kg/cm 2 ) | ||
|---|---|---|---|
| Prelude (1) | |||
| 2.2L Engine (F22A1) | |||
| Vacuum Hose Disconnected | 36-43 (2.5-3.0) | ||
| Vacuum Hose Connected | 28-35 (2.0-2.5) | ||
| 2.2L Engine (H22A1) | |||
| Vacuum Hose Disconnected | 33-40 (2.3-2.8) | ||
| Vacuum Hose Connected | 25-32 (1.8-2.3) | ||
| 2.3L Engine (H23A1) | |||
| Vacuum Hose Disconnected | 36-43 (2.5-3.0) | ||
| Vacuum Hose Connected | 28-35 (2.0-2.5) | ||
| (1) Measure regulated fuel pressure with vacuum hose connected and disconnected from pressure regulator. | |||
| (1) | Measure regulated fuel pressure with vacuum hose connected and disconnected from pressure regulator. |
REGULATED FUEL PRESSURE
See also:
• WIRING DIAGRAMS
• ADJUSTMENTS