FUEL SYSTEM PRESSURE RELEASE
| WARNING | ALWAYS relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. |
FUEL PRESSURE RELEASE
Disconnect negative battery cable. Remove fuel cap to release fuel tank pressure. Using EFI Pressure Gauge (T80L-9974-B), release fuel pressure from relief valve. Relief valve is located on fuel supply manifold.
INJECTION PUMP
| CAUTION | Fuel system contamination will damage finely machined parts within injection pump and injector nozzles. Clean fittings with fuel oil or solvent and blow dry with compressed air before disconnecting fuel lines. Cap all open fittings. Injection pump can be severely damaged if engine is washed or steam cleaned while engine is hot or running. |
THROTTLE POSITION SENSOR (TPS)
Note. On 7.3L engines, a Fuel Injection Pump Lever (FIPL) sensor is used instead of a TPS. For FIPL service procedures, see ON-VEHICLE ADJUSTMENTS article.