Fuel Pressure: Testing and Inspection

FUEL PRESSURE

Fuel Pressure Check


FUEL PRESSURE RELEASE

With CONSULT
1.Turn ignition switch ON.
2.Perform "FUEL PRESSURE RELEASE" in "WORK SUPPORT" mode with CONSULT.
3.Start engine.
4.After engine stalls, crank it 2 or 3 times to release all fuel pressure.
5.Turn ignition switch OFF.
Without CONSULT





1.Remove fuel pump fuse (1) located in IPDM E/R (2).
2.Start engine.
3.After engine stalls, crank it 2 or 3 times to release all fuel pressure.
4.Turn ignition switch OFF.
5.Reinstall fuel pump fuse after servicing fuel system.

FUEL PRESSURE CHECK


CAUTION:
- Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
- Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the quick connector o-ring maintains seal ability.
- Use Fuel Pressure Gauge Kit [SST (J-44321)] and Fuel Pressure Adapter [SST (J-44321-6)] to check fuel pressure.
- Never perform fuel pressure check with electrical system operating (i.e. lights, rear window defogger, A/C, etc.). Fuel pressure gauge may indicate false readings due to varying engine loads and changes in manifold vacuum.
NOTE:
Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pressure cannot be completely released because R51 models do not have fuel return system.
1.Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".
2.Remove engine cover.
3.Remove fuel hose using Quick Connector Release [SST (J-45488)]. Exploded View.
- Never twist or kink fuel hose because it is plastic hose.
- Never remove fuel hose from quick connector.
- Keep fuel hose connections clean.





4.Install Fuel Pressure Adapter [SST (J-44321-6)] and Fuel Pressure Gauge [SST (J-44321)] (1) as shown in the figure.
- Never distort or bend fuel rail tube when installing fuel pressure gauge adapter.
- When reconnecting fuel hose, check the original fuel hose for damage and abnormality.
5.Turn ignition switch ON (reactivate fuel pump), and check for fuel leakage.
6.Start engine and check for fuel leakage.
7.Read the indication of fuel pressure gauge.
- During fuel pressure check, check for fuel leakage from fuel connection every 3 minutes.

At idling:
Approximately 350 kPa (3.57 kg/cm2, 51 psi)

8.If result is unsatisfactory, go to next step.
9.Check the following.
- Fuel hoses and fuel tubes for clogging
- Fuel filter for clogging
- Fuel pump
- Fuel pressure regulator for clogging
If OK, replace fuel pressure regulator.
If NG, repair or replace malfunctioning part.
10.Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter [SST (J-44321-6)], release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".