Start with inspecting the electrical condition of the fuel pump.
Perform the following procedure:
a. Turn the ignition switch OFF .
b. Unplug the fuel pump electrical connector.
c. Using an ohmmeter, set on the lowest scale, connect the probes to terminals a and c ,the resistance should approximately be 0 Ohms. if not within specifications, the fuel pump may be faulty.
d. If the fuel pump resistance is OK, plug in the fuel pump electrical connector.
Release the fuel pressure. Connect a fuel pressure gauge between the fuel filter outlet and fuel feed tube
Connecting a pressure gauge between the fuel filter outlet and the fuel rail inlet tube will allow an accurate reading of the fuel pressure.
1995-98 models: 34 psi (235 kPa)-At idle, fuel pressure regulator vacuum hose connected
Make sure the fuel filter is not blocked before replacing any fuel system components.
Stop the engine. Disconnect the fuel pressure regulator vacuum hose from the intake manifold and plug the intake manifold opening.
Using a variable vacuum source, connect it to the fuel pressure regulator.
Start the engine and read the fuel pressure gauge as the vacuum is changed.
If pressure is not as specified, replace the pressure regulator and repeat the test. If the pressure is still incorrect, check for clogged or deformed fuel lines, then replace the fuel pump.
Tuesday, February 16th, 2010 AT 10:24 AM