Fuel Pressure: Testing and Inspection

Fuel Rail Plug Bolt:

Comp. Loc:

FUEL SYSTEM PRESSURE TEST
A fuel system pressure test is a part of several diagnostic charts and symptoms checks. To perform this test, follow the procedure listed below.

TOOLS REQUIRED
J34730-1 Fuel Pressure Gage
J39021 Fuel Injector Tester
J39200 Digital Multimeter
J41011 Fuel Pressure Gage Adapter

PROCEDURE
1. Relieve fuel pressure. Refer to Fuel Pressure Relief Procedure under Service and Repair.
2. Remove fuel plug bolt from fuel rail (refer to image).
3. Install a J41041 Fuel Pressure Gage Adapter to fuel rail (refer to image).
4. Install a J34730-1 Fuel Pressure Gage to J410411 Fuel Pressure Gage Adapter (refer to image).
5. Reconnect negative (-) battery cable. Tighten negative (-) battery cable-to-negative (-) battery terminal retainer to 15 Nm (11 lb. ft.).
6. Start engine and idle at normal operating temperature.
7. Check fuel pressure as follows:

^ Idling - 210-260 kPa (30-37 psi).
^ Engine not running, ignition switch in the "ON" position - 250-300 kPa (36-43 psi).
^ Within one minute with engine not running, ignition switch in the "ON" position - pressure should hold at about 180 kPa (26 psi).

If pressure is not within specification, refer to On-Board Diagnostic System Check under Computers and Control Systems.

8. Relieve fuel system pressure. Refer to Fuel Pressure Relief Procedure.
9. Disconnect J34730-1 and J41041 from fuel rail. Use shop towel to catch any remaining fuel that may leak.
10. Install fuel rail plug bolt. Tighten fuel rail plug bolt to 45-55 Nm (33-39.5 lb. ft.).
11. Connect negative (-) battery cable. Tighten negative (-) battery cable-to-negative (-) battery terminal retainer to 15 Nm (11 lb. ft.).
12. Turn ignition switch to "ON," and then back to "LOCK" to pressurize the fuel system. Check for any fuel leaks.