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HOMESERVICE MANUALSPLYMOUTH1994VOYAGER LE, 3.3 RREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 3.8LSELF-DIAGNOSTIC TESTSTEST NTC-3B - CHECKING FUEL PRESSURE
1994 Plymouth Voyager LE, 3.3 R

Test NTC-3B - Checking Fuel Pressure

1994 Plymouth Voyager LE, 3.3 RSECTION Test NTC-3B - Checking Fuel Pressure
WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE  procedure in this article.
  1. Using DRB, stop fuel system actuation. Release fuel pressure. Ensure fuel tank is at least 1/4 full before performing following test. Install fuel pressure gauge and adapter between fuel tank and filter at rear of vehicle.
  2. Remove fuel return line from fuel pump at fuel tank. Connect Fuel Pressure Test Adapter (6541) to fuel return line. Place other end of adapter hose into an approved 2-gallon gasoline can. Turn ignition on.
  3. Using DRB, actuate fuel system. Observe fuel pressure gauge. If fuel pressure is 43-53 psi (3.0-3.7 kg/cm2 ), repair fuel return line for a restriction at fuel tank. Perform TEST VER-2  .
  4. If fuel pressure is not 43-53 psi (3.0-3.7 kg/cm2 ), stop fuel system actuation. Release fuel pressure. Reconnect fuel return line to fuel tank. Disconnect fuel return line from fuel rail.
  5. Attach Fuel Pressure Test Adapter (6541) to fuel return line nipple at fuel rail. Place other end of adapter hose into an approved 2-gallon gasoline can. Turn ignition on. Using DRB, actuate fuel system. Observe fuel pressure gauge.
  6. If fuel pressure is 43-53 psi (3.0-3.7 kg/cm2 ), repair fuel return line for a restriction to fuel tank. Perform TEST VER-2. If fuel pressure is not 43-53 psi (3.0-3.7 kg/cm2 ), inspect fuel pressure damper line for any restrictions. Replace fuel pressure dampener line if necessary. Perform TEST VER-2. If no restrictions exist, replace fuel pressure regulator. Perform TEST VER-2.
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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.