8B - Fuel Pressure Test

8b. Fuel Pressure Test







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

Recommended Procedure:

Econoline






If necessary remove the alternator and bracket from the right side of the engine to remove the 1/8-inch pipe plug from the top front of right 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. DO NOT brake torque engine more than 10 seconds. After testing move the transmission range selector lever to N (NEUTRAL), and run the engine for about 15 seconds to allow the torque converter to cool. If fuel pressure is not within 207-552 kPa (30-80 psi), replace right head check valve, which is located on the rear of the right head between the fuel inlet line and the head.

F-Series






Remove the 1/8-inch pipe plug from the top rear of the 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 fuel pressure is not within 207-552 kPa (30-80 psi), replace left head check valve, which is located on the front of the left head between the fuel inlet line and the head.