13. Electric Fuel Pump Pressure
13. ELECTRIC FUEL PUMP PRESSUREPurpose:
The purpose of this test is to verify the fuel system pressure.
Electric Fuel Pump Pressure
- Measure the fuel pressure using the Fuel Line Adapter 310-159 or equivalent.
- Road test the vehicle with the engine at full load condition.
NOTE: If using a scan tool for the fuel pump pressure test, the scan tool value may vary by 10% on the 20.7 kPa (3 psi) specification.
If pressure fails low, go to test 14, Fuel Conditioning Module Inlet Restriction Test. 14. Fuel Conditioning Module Inlet Restriction Test
If fuel pressure is above specification, check the fuel return lines for a restriction.
If no restriction is present, install a new fuel pressure regulator valve in the secondary fuel filter housing.
Recommended Procedure:
- Verify there is fuel in the tank.
- Disconnect the fuel line on the outlet side of the fuel conditioning module. Install the Fuel Line Adapter 310-159 or equivalent and the Magnehelic Gauge(R) 0-200 kPa (0-30 psi) Bar (part of Pressure Adapter Kit 014-00761 or equivalent). Measure the fuel pressure with the key in the ON position and the engine OFF. If fuel pressure is below 20.7 kPa (3 psi), go to the next step to verify no restriction.
- Road test the vehicle at a full load condition.
If pressure fails low, go to test 14, Fuel Conditioning Module Inlet Restriction Test. 14. Fuel Conditioning Module Inlet Restriction Test
If fuel pressure is above specification, check the fuel return lines for a restriction.
If no restriction is present, install a new fuel pressure regulator valve in the secondary fuel filter housing.
Possible Causes:
- Fuel return line restriction
- Fuel pressure regulator valve in the secondary fuel filter housing
Tools Required:
Magnehelic Gauge(R) 0-200 kPa (0-30 psi) Bar (part of Pressure Adapter Kit 014-00761 or equivalent)
Fuel Line Adapter 310-159 or equivalent