8A - Fuel Pressure Test

8a. Fuel Pressure Test

Purpose:

Fuel Pressure Test:

To determine if fuel system is producing specified pressure at the fuel rails.

Recommended Procedure:

E-Series







Remove the doghouse cover and remove the 1/8-inch pipe plug from the top rear of left head. Install Gauge 0-1.1 MPa (0-160 psi) Bar 014-00761 or equivalent. Run engine at idle and check for leaks from the line to the gauge. Measure pressure with a full load on the engine. If pressure is not within 310-552 kPa (45-80 psi), replace fuel filter. Retest and if still below specification, replace left head check valve, which is located on the front of the left head between the fuel inlet line and the head.

F-Series







Remove the 1/8-inch pipe plug from the top front of the right head. Install Gauge 0-1.1 MPa (0-160 psi) Bar 014-00761 or equivalent. Run engine at idle and check for leaks from the line to the gauge. Measure pressure with a full load on the engine. If pressure is not within 310-552 kPa (45-80 psi), replace fuel filter. Retest and if still below specification, replace right head check valve, which is located on the rear of the right head between the fuel inlet line and the head.

Possible Causes:
- Fuel filter
- Head check valve