Testing - Ford Ranger Maintaince And Repair Manual

HOW TO USE THIS BOOK

TESTING

CAUTION
Fuel pressure must be relieved before attempting to disconnect any fuel lines.
The diagnostic pressure valve (Schrader valve) is located on the fuel supply manifold (rail). This valve
provides a convenient point for service personnel to monitor fuel pressure, release the system pressure prior to
maintenance, and to bleed out air which may become trapped in the system during pressure replacement. A
pressure gauge with an adapter is required to perform pressure tests.
Fuel pressure can be checked using an inexpensive pressure/vacuum gauge
If the pressure tap is not installed or an adapter is not available, use a T−fitting to install the pressure gauge
between the fuel filter line and the throttle body fuel inlet or fuel rail.
To test the fuel pump, follow the accompanying diagnostic charts. Testing fuel pressure requires the use of a
special pressure gauge (Ford Tool T20L−3314−B, Rotunda Fuel Pressure Testing Kit 014−00441, or
equivalent) that attaches to the diagnostic pressure tap fitting. To perform the fuel system test a scan tool is
necessary to access the different test modes.
Depressurize the fuel system before disconnecting any lines.
TESTING 617