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How do you check the main fuel pump?

Updated: 8/19/2019
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11y ago

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To check if your fuel pump is working take out the fuel pump relay and jump the wires that go to the switch in the relay ( marked on the side or labelled 30 and 87 on the relay ) with a jumper wire. Walk back to your tank and you should hear it come on. Don't let it run for any longer than necessary or you will overpressure your fuel system. Another way to check is to disconnect your battery and remove the pump from your tank and jump it with wires from a good battery. Just because the pump comes on doesn't mean its pumping enough pressure to your fuel rail. To test for pressure use a fuel pressure gauge ( they come with instructions ) and test for the correct pressure listed in your repair/shop manual.

Actually it would be safer to substitute the relay with a good known one. There are several on the fuse and relay block so just remove the one for the fuel pump and substitute with interior light relay or something like that. This way you won't come into contact with any electrical current and you will not over pressurize the fuel system

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