Fuel Pressure: Testing and Inspection

Installing Jumper Wire:

Functional Inspection
- Turn ignition on, do not start.
- Using a jumper wire, short check connector terminals FP and +B together.

Checking For Fuel Pressure:

- Fuel pump pulsations should be able to be felt by grasping the fuel inlet hose.
- If no pressure is present, check the following
^ Fuses
^ SFI main relay
^ Fuel pump
^ Fuel pump ECU
^ ECM
^ Wiring connections

Union Bolt:

Fuel Pressure Inspection
- Turn ignition OFF.
- Disconnect negative battery terminal.
- Remove union bolt from cold start injector supply line.

Connecting Fuel Pressure Gauge:

- Install additional union and gauge to fuel rail, leaving original line intact.
- Reconnect battery terminal.

Installing Jumper Wire:

- Install jumper wire between check connector terminals +B and FP.
- Turn ignition on and check fuel pressure.

Desired - 38 to 44 psi (265 to 304 kPa)

- Remove jumper wire.
- Start engine.

Fuel Pressure - No Vacuum To Regulator:

- Disconnect and plug pressure regulator vacuum hose.
- Check fuel pressure.

Desired - 38 to 44 psi (265 to 304 kPa)

Fuel Pressure - Vacuum To Regulator:

- Reconnect vacuum hose.
- Check fuel pressure.

Desired - 33 to 37 psi (226 to 265 kPa)

- If pressure is incorrect, or did not change, check for available vacuum at regulator. If vacuum is present, replace regulator.
- Stop engine.
- Check fuel pressure 5 minutes after engine shut-off.

Desired - Above 21 psi (147 kPa)

- If pressure does not hold, block return line and repressurize system by installing jumper wire and turning on ignition for a few seconds.
- If pressure now holds, replace pressure regulator.
- If pressure still does not hold, replace fuel pump.