C 2500 Suburban 2WD V8-454 7.4L (1994)
Fuel Pressure: Specifications
FUEL PRESSURE
WITH ECM
1. Ignition "OFF" for 10 Seconds.
2. With ignition "ON," engine "OFF" and fuel pump running, pressure should be 62-89 kPa (9-13 psi).
WITH PCM AND 4.3, 5.0, 5.7L ENGINE
1. Ignition "OFF" for 10 Seconds.
2. With ignition "ON," engine "OFF" and fuel pump running, pressure should be 62-90 kPa (9-13 psi).
For additional testing procedures,
WITH PCM AND 7.4L ENGINE
1. Ignition "OFF" for 10 Seconds.
2. With ignition "ON," engine "OFF" and fuel pump running, pressure should be 179-220 kPa (26-32 psi).
For additional fuel pressure testing procedures, See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic
Trouble Code Tests and Associated Procedures/Related Tests and Information/Chart A-6 Fuel System Diagnosis