Fuel Pump
Perform all tests at idle RPM. Pinch off fuel return line (if equipped). Connect pressure gauge to fuel line at carburetor or throttle body and hold gauge level with carburetor or throttle body.
FUEL PUMP PERFORMANCE
| Application | Specification | |||
|---|---|---|---|---|
| Pressure (At Idle) | ||||
| 4.1L DFI | 9-12 psi (.63-.84 kg/cm2 ) | |||
| 4.1L MFI | (1) | |||
| 5.0L (Mechanical) | 5.5-6.5 psi (.39-.46 kg/cm2 ) | |||
| 5.0L TPI (Electric) | 40.5-47.0 psi (2.8-3.3 kg/cm2 ) | |||
| 5.7L TPI (Electric) | 34-46 psi (2.4-3.2 kg/cm2 ) | |||
| Volume (At Idle) | 1 pt. (.5L) in 30 sec. | |||
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