Question about 2003 Ford Expedition
Normal fuel pressure for your vehicle is 30 to 45 psi.
What you are concerned with is pressure bleeding off after the engine is shut down; if you shut the engine off it should still be showing the same or very close to the same pressure after a couple hours of sitting. If it does not, fuel pressure is being lost through a faulty fuel pump, faulty pressure regulator, leaking injector, or an external leak in the system somewhere...
If pressure is bleeding down, try clamping the fuel supply line shut immediately after shutting the engine off. This will tell you whether or not pressure is being lost back through a worn pump.
If this does not stop the pressure loss, then repeat the test and clamp off the fuel return line. If this stops the pressure loss, then a leaking fuel pressure regulator is the cause.
What it otherwise sounds like is a loose connection in the electrical system otherwise like you may not be getting the power needed to the pump.
Posted on Jul 13, 2009
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Posted on Jan 02, 2017
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