This test result usually means that one of the following components is bad:Īlthough it's beyond the scope of this tutorial to test these 3 components, your next step is to test each one. This is an indication that the selected fuel pump (that registered the lower than specified fuel pressure) is failing and needs to be replaced.ĬASE 4: Both selected fuel tank fuel pumps indicated 0 PSI fuel pressure. This test result lets you know that the selected fuel pump is not supplying enough fuel to have the engine run optimally. This test result lets you know that the selected fuel pump (that registered 0 PSI) is bad and needs to be replaced.ĬASE 3: One selected fuel tank fuel pump (but not both) registered a lower fuel pressure than the specification. This test result lets you know that the selected fuel pump is not sending fuel to the fuel injectors and is causing the engine to not start. If you're troubleshooting an engine performance problem (where the engine starts but runs bad), then you can conclude that the fuel pump (from either tank) is not behind the problem.ĬASE 2: One selected fuel tank fuel pump (but not both) registered 0 PSI. If you're troubleshooting an 'engine does not start' problem, then you can conclude that the fuel pump (from either tank) is not behind the problem.
This test result also lets you know that the fuel pump relay and fuel pump inertia switch are OK and doing their job.
This is the correct test result and it lets you know that the front tank and rear tank fuel pumps are OK on your Ford F150 (F250 or F350).
Select the REAR fuel tank and repeat step 6 and step 7.ĬASE 1: Both selected fuel tank fuel pumps registered the indicated fuel pressure.
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