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Home >> Plymouth >> 1987 >> Voyager Base, 2.6 G >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Pump - Electric >> Testing >> Fuel Pump Pressure Test >> 2.5L TBI Models

2.5L TBI Models

  1. Release pressure each time a fuel hose is to be disconnected. Disconnect 5/16" fuel supply hose from engine fuel line assembly. Connect Testers (C-3292 and C-4749) between fuel supply hose and engine fuel line assembly. Install ATM Tester (C-4805). Place ignition switch in "RUN" position.
  2. Depress ATM button to activate fuel pump and pressurize system. If gauge reading is 13.5-15.5 psi (.949-1.08 kg/cm2 ), pressure is correct and no further testing is required. Reinstall fuel hose using new original equipment clamp. Tighten clamp to 10 In. lbs. (.85 N.m.).
  3. If fuel pressure is below specifications, install tester between fuel supply tube and fuel filter inlet hose. Repeat test. If pressure now meets specifications, replace fuel filter. If no change is observed, gently squeeze return hose. If pressure increases, replace pressure regulator. If no change is observed, pump filter sock is plugged or fuel pump is defective.
  4. If pressure is above specifications, remove fuel return hose from throttle body. Connect a substitute hose to body and place other end of hose in a clean container. Repeat test. If pressure is now correct, check for restricted fuel return line. If no change is observed, replace fuel regulator.
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