8C - Fuel Pressure Test at Left Head

8c. Fuel Pressure Test at Left Head





Purpose:
To determine if there is a restriction in the fuel filter or the head check valve.





Recommended Procedure:
Remove the doghouse cover and remove the 11 8-inch pipe plug from the top rear of left head. Install Gauge (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 measures below specification (30-80 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.

Possible Causes:
- Fuel filter
- Head check valve