Tandem Fuel Pump Pressure Test
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- Connect Engine Pressure Test Kit (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 Figure
- Crank engine (minimum of 100 RPM) for 20 seconds and observe fuel pressure gauge. If fuel pressure is 20 psi (138 kPa) or more, fuel pressure is okay. If fuel pressure is less than 20 psi (138 kPa), replace fuel filter and retest. Cycle ignition switch several times to purge air from system. If fuel pressure is still low, check the following:
- Check fuel level in gas tank.
- Disassemble, inspect and clean fuel pressure regulator valve. See Fig 1.
- Check for bent or damaged fuel lines. Check for blockage at fuel pick-up tube.
- Check for loose fuel line on suction side of fuel system. If fuel line is tight, replace fuel pump and retest.