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Home >> Acura >> 1990 >> Integra LS, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Fuel Pressure >> Pressure Testing
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Pressure Testing

  1. After relieving fuel pressure, connect Fuel Pressure Gauge (07406-0040001 ) at 6mm service bolt location. Reconnect negative battery cable. Start engine and note fuel pressure on gauge. If vehicle will not start, has spark but no fuel pressure, inspect fuel pump main relay. See SYSTEM/COMPONENT TESTS article.
  2. Disconnect vacuum hose from pressure regulator (fuel pressure gauge should rise slightly) and inspect for manifold vacuum. If vacuum is not present, check for restriction in vacuum port or hose. Plug vacuum hose and check fuel pressure gauge. Gauge reading should be 36-41 psi (2.6-2.9 kg/cm2 ).
  3. If pressure is higher than specified, inspect 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, inspect 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 does rise, replace pressure regulator.
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