Fuel Pressure Leaks Down
- Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure Relief .
- Install the EN 37287 Adapter between the chassis fuel feed hose and the engine compartment fuel feed pipe.
- Open the valve on the EN 37287 Adapter.
- Ignition ON, command the Fuel Pump Enable On with a scan tool and bleed the air from the CH 48027 Gauge.
- Command the Fuel Pump Enable On and then Off with a scan tool.
- Close the valve on the EN 37287 Adapter.
- Verify that the fuel pressure does not decrease more than 34 kPa (5 psi) in 1 min.
- If greater than 34 kPa (5 psi)
Locate and replace the leaking Q17 Fuel Injector.
- If less than 34 kPa (5 psi)
Replace the G12 Fuel Pump.
- If greater than 34 kPa (5 psi)