1990 Plymouth Acclaim LXFACTORY OEM SERVICE PROCEDURE

3.0L Fuel Pump Test

  1. Release fuel pressure. See FUEL PRESSURE RELEASE  in this article. Remove cap from service valve on fuel rail. Connect fuel system pressure Gauge (C-4799-A) to service valve.
  2. Turn ignition on. Using DRB-II (C-4805), activate fuel pump. See FUEL PUMP PRESSURE SPECIFICATIONS  in this article. If fuel pump pressure is at specification, fuel system is functioning properly.
  3. If fuel pressure is not to specification, record pressure and remove gauge. Using DRB-II, activate fuel pump. Ensure no fuel leaks from service valve. Install cap on service valve.
  4. If fuel pressure is not to specification, install pressure gauge in fuel supply line between fuel tank and fuel filter at rear of vehicle. Using DRB-II, activate fuel pump.
  5. Record pressure reading. If fuel pressure is 5 psi (.4 kg/cm2 ) higher than first pressure reading, replace fuel filter. If no change in pressure reading is observed, gently squeeze fuel return hose.
  6. If fuel pressure increases, replace fuel pressure regulator. If no change in fuel pressure is observed, problem is plugged fuel pump filter sock or defective fuel pump.
  7. If fuel pressure is more than specification, remove fuel return hose at rear of vehicle. Connect an extension hose to return hose. Place hose in an approved container with at least a 2 gallon capacity.
  8. Using DRB-II, activate fuel pump. If fuel pressure is now within specification, check in-tank return fuel hose for kinking. Replace fuel tank assembly if in-tank reservoir check valve or aspirator jet is plugged.
  9. If fuel pressure is still more than specification, remove fuel return hose from pressure regulator. Connect a substitute hose to fuel pressure regulator. Place other end of hose in an approved container.
  10. Using DRB-II, activate fuel pump. If fuel pressure is at specification, check for a restricted fuel return line. If no change was observed, replace fuel pressure regulator.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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