Tandem Fuel Pump Pressure Test
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NOTE:
If HIGH FUEL RESTRICTION indicator light is on, a restricted fuel filter may be causing low fuel pressure.
- Connect Engine Pressure Tester (014-00761) and Adapter (014-00931-3) to Schrader valve. Schrader valve is part of fuel regulator block. Connect fuel line between adapter and 0-160 psi (0-1103 kPa) gauge (No. 6) at engine pressure tester. See Fig 1.
- Start engine and allow it to idle. Observe fuel pressure gauge and briefly raise engine speed to 3500 RPM. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article. If fuel pressure is within specification, fuel pressure is okay. If fuel pressure is less than specification, replace fuel filter and retest. Cycle ignition switch several times to purge air from system. If fuel pressure is still low, go to next step.
- Disconnect short fuel hose at fuel inlet line. Hose is located on left side of engine, close to frame rail. The larger of the 2 lines is the fuel inlet. The smaller line is the fuel return. Connect Fuel Pressure Adapter (014-00931-2) between fuel inlet line and vacuum gauge (0-30 in. Hg) of engine pressure tester.
- Start engine and allow it to idle. Observe vacuum gauge and briefly raise engine speed to 3500 RPM. If vacuum is 6 in. Hg or less, no restriction exist at this time. Check fuel regulator valve for sticking or debris. If vacuum is more than 6 in. Hg, check for blockage between pump and fuel tank. Repair as necessary.