This means that it's always a good idea to check and reset the inertia switch whenever testing the fuel pump. The fuel pump inertia switch is tasked with the job of cutting power (or ground) to the fuel pump in case of an impact, which causes the engine to stall (if it was running) or for the engine to crank but not start due to a lack of fuel.Īlthough it's designed to activate during a severe impact cause by an automobile accident, sometimes it gets activated by less than severe impacts (and this happens a lot). Generally on the passenger side of the engine. The Schrader valve is always located on the fuel injector rail (on the vehicles covered by this tutorial). The cause of your Crown Victoria's (E150, Mustang, Town Car, Navigator, Thunderbird, etc.) no-start condition is caused by something else. Taking into account the above conditions I've just mentioned and to make sure that the fuel pump is really the cause of this 0 PSI fuel pressure reading, you must verify that the fuel pump is getting power (12 Volts) when the engine is cranking (this is accomplished from underneath the vehicle, by tapping into the wire that feeds the fuel pump with power, with a multimeter).ĬASE 2: If the fuel pressure gauge registered 35 PSI: This fuel pressure gauge result lets you know that the fuel pump is working and delivering enough fuel to the fuel injectors. For example, you could have a blown fuel pump fuse, or a bad fuel pump relay or a fuel pump interrupt switch that has activated. This result usually means that the fuel pump is bad but not always. This confirms that the cause of your F150's (Expedition, Crown Victoria, Thunderbird, Cougar, Grand Marquis, etc.) is caused by a lack of fuel. OK, now that the testing part is done, let's take a look at what your results mean:ĬASE 1: If the fuel pressure gauge registered 0 PSI.
Your fuel pressure gauge will register one of the two following results:ġ.) The fuel pressure gauge will register 35 PSI, orĢ.) The fuel pressure gauge will register 0 PSI.
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