14. Fuel Conditioning Module Inlet Restriction Test
14. FUEL CONDITIONING MODULE INLET RESTRICTION TESTPurpose:
The purpose of this test is to isolate the cause of low fuel pressure.
Electric Fuel Pump Inlet Restriction
Measure restriction at fuel pump inlet.
Recommended Procedure:
Disconnect the fuel line to the inlet side of the fuel conditioning module. Install the Fuel Line Adapter 310-159 or equivalent and the vacuum gauge 0-30 in-Hg vacuum. Measure the restriction at wide open throttle (WOT) (maximum engine speed out of gear with the brakes set and the wheels blocked). If restriction is greater than 6 in-Hg, there is a restriction between the fuel pump and the fuel tank. If the restriction is less than 6 in-Hg, inspect both fuel filters. If the filters are OK, install a new fuel conditioning module.
Possible Causes:
- Fuel line restriction
- Fuel filters
- Fuel conditioning module
Tools Required:
Fuel Line Adapter 310-159 or equivalent
Vacuum Gauge (part of DSL ENG Pressure Test Kit 014-00761 or equivalent)