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HOMESERVICE MANUALSHONDA1994CIVIC DX, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMFUEL PRESSUREPRESSURE TESTING
1994 Honda Civic DX, 4D Sedan, Automatic

Pressure Testing

1994 Honda Civic DX, 4D Sedan, AutomaticSECTION Pressure Testing
  1. Disconnect negative battery cable. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Connect Fuel Pressure Gauge (07406-0040001 ) at 6-mm bolt. Reconnect negative battery cable. Start engine, and note fuel pressure. If vehicle will not start, check for spark. If spark is present and no fuel pressure is evident, inspect fuel pump main relay.
  2. Remove connector from fuel pump main relay. See Fig 1 . Using a test light, check power on Black/Yellow wire at fuel pump relay connector. If power is present, go to next step. If power does not exist, repair open wire between fuel pump main relay connector and fuse No. 2 on fuse box. Go to step 4).
    Fig 1: Locating Fuel Injection Main Relay
    G92B26659Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Connect jumper wire between Black/Yellow wire (B+) and Yellow/Green wire. If fuel pump runs, go to next step. If fuel pump fails to run, see SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE Section.
  4. Start engine. Disconnect vacuum hose from pressure regulator, and check for manifold vacuum. If vacuum is not present, check for restriction in vacuum port or hose. Plug vacuum hose and inspect fuel pressure gauge reading. Gauge reading should be within specification. See REGULATED FUEL PRESSURE  table. Pressure should drop slightly when vacuum hose is reconnected.
    REGULATED FUEL PRESSURE

    Application At Idle psi (kg/cm2 )
    Civic & Civic Del Sol (1)
    Vacuum Hose Disconnected 40-47 (2.8-3.3)
    Vacuum Hose Connected 30-38 (2.1-2.7)
    (1) Measure regulated fuel pressure with vacuum hose connected and disconnected from pressure regulator.
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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.