1993 Acura Integra GS-RFACTORY OEM SERVICE PROCEDURE

Pressure Testing

  1. After relieving fuel pressure, connect Fuel Pressure Gauge (07406-0040001 ) at 6-mm service bolt location. Reconnect negative battery cable. Start engine and note fuel pressure on gauge. See REGULATED FUEL PRESSURE  table. If vehicle will not start, but has spark and no fuel pressure, inspect fuel pump relay. See appropriate FUEL PUMP RELAY procedure.
  2. Disconnect vacuum hose from pressure regulator (fuel pressure gauge should rise), and check for manifold vacuum. If vacuum is not present, check for restriction in vacuum port or hose. Plug vacuum hose, and note fuel pressure on gauge. See REGULATED FUEL PRESSURE  table.
  3. If pressure is higher than specified, check for pinched or clogged fuel return line between fuel rail and fuel tank. If no problem is found in fuel line, replace pressure regulator.
  4. If pressure is lower than specified, check for plugged fuel filter. If filter is not plugged, lightly pinch off fuel return line. If fuel pressure does not rise, replace fuel pump. If fuel pressure rises, replace pressure regulator.
    REGULATED FUEL PRESSURE

    Application At Idle W/O Vacuum psi (kg/cm2 ) At Idle W/ Vacuum psi (kg/cm2 )
    Integra
    1.7L 48-56 (3.4-3.9) 39-46 (2.8-3.3)
    1.8L 41-48 (2.9-3.4) 33-39 (2.3-2.8)
    Legend
    Coupe 44-51 (3.1-3.6) 36-43 (2.5-3.0)
    Sedan 35-41 (2.5-2.9) 29-35 (2.1-2.4)
    Vigor 43-50 (3.0-3.5) 33-41 (2.3-2.9)
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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