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There are a couple reasons. First what kind of car is it? It could be a relay. It also could be an inertia switch located some where. If it tripped you won't get power to the fuel pump.

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βˆ™ 2007-01-16 20:08:51
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βˆ™ 2020-10-26 17:36:24
i have an 05 GMC sierra, my fuel pump is getting power for about two seconds then loses all power. it won’t send fuel to the rail, i have replaced the crankshaft sensor, fuel pump, ignition switch, have searched for the inertia switch, and recently theECM
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βˆ™ 2020-10-26 17:37:24
do you happen to know anything about these vehicles to happen to have an idea of what’s going on?
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Q: Why would you not be getting power to a new fuel pump?
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