Check For Air In Fuel System

1. Disconnect fuel return hose at fuel filter. Install a clear fuel hose between fuel return hose and fuel return hose fitting at fuel filter. Loop hose at a point higher then fuel filter. See Fig 1. While observing fuel line, start and run engine for about 5 minutes. Fuel should be free of air.
2. If fuel is foamy, check for an air leak in fuel lines between fuel pump and fuel tank. Repair as necessary. If no fuel flow exists, remove fuel regulator block, taking care not to damage "O" ring. Inspect fuel strainer assembly (1995 models only) and fuel return orifice screen for debris. Clean as necessary. See Fig 2.

Fig 1: Checking For Air In Fuel System

Courtesy of FORD MOTOR CO.

Fig 2: Exploded View Of Fuel Regulator Block

Courtesy of FORD MOTOR CO.