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Home >> Honda >> 1994 >> Prelude L4-2.2L SOHC >> Repair and Diagnosis >> Powertrain Management >> Tune-up and Engine Performance Checks >> Fuel Pressure >> Testing and Inspection
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Fuel Pressure: Testing and Inspection


WARNING: Do not smoke while working on the fuel system. Keep open flames or sparks away from the work area. Be sure to relieve fuel pressure while the engine is OFF.


RELIEVE FUEL PRESSURE
1. Disconnect the negative battery cable.
2. Remove the fuel tank filler cap.

Loosening Service Bolt At Fuel Pipe:





3. Use a box end wrench on the 6mm service bolt at the fuel pipe, while holding the special banjo bolt with another wrench.
4. Place a rag or shop towel over the 6mm service bolt and SLOWLY loosen the 6mm service bolt one complete turn.

Checking Fuel Pressure At Fuel Pipe:





INSPECTION
1. Remove the service bolt on the fuel pipe while holding the banjo bolt with another wrench and attach the fuel pressure gauge.
2. Start the engine. Measure the fuel pressure with engine idling and the vacuum hose of the fuel pressure regulator disconnected.
3. Pressure should read 255 - 305 kpa (36 - 43 psi)
4. Reconnect the vacuum hose to the fuel pressure regulator.
5. Pressure should read 195 - 245 kpa (28 - 35 psi)
6. If the fuel pressure is not as specified check the fuel pump. If the fuel pump is okay, then check as follows:
^ If the pressure is higher than specified inspect for:
- Pinched or clogged fuel return hose or line.
- Faulty fuel pressure regulator.
^ If the pressure is lower than specified:
- Clogged fuel filter.
- Faulty fuel pressure regulator.
- Leaking fuel line.
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