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How can you tell if the fuel pump relay is bad?

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I have found that it is rare that a relay completely fails(not saying that it won't happen) just rare, that being said, you could use a multi-meter to test for continuity through the contacts, and you could get creative and energize the coil to make sure it is operating, but if you suspect the relay,I would replace it, they don't cost much and at least you will have removed that part as a suspect of the problem.

Good Luck !

Posted on Feb 08, 2010


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drop the tank ... use a brass punch to loosen the ring ... to find/replace the pump.

the relay is operated by the computer ...

Check for volts on the outgoing side of the relay ...

check for signal on the input side

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If you are still interested ... there is lots more to this. If you are getting weak knees ... remember after you drop the tank and remove the fuel pump ... you are stuck

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Fuel Pump is not activating when ignition switch is turned, I can hear the clicks in the relay box. Does this mean the relay went bad?

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How can you tell if the fuel pump or the fuel relay are bad, just changed the filter car ran fine for a day. can't here the pump all the time, it seems to come and go.What do think?

very good chance the fuel pump is going can put your figer on top of the fuel pump relay and have someone turn on the key listen and feel for a click from the relay. if none you will need to use a volt meter and check the fuel pump fuse.if ok replace the fuel pumpor drop the tank and test for voltage to pump. hope this helps.

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No Power to Fuel pump

I would check the ground for the fuel pump relay that operates the switch side of the relay.
You should have 2 12v inputs to the relay. When the relay gets 12v input, it closes the relay switch on the heavy current side that sends 12v to the fuel pump.

A relay is needed because you don't want heavy current going through the switch.

Also, most cars only run the fuel pump for 2 seconds when the key is turned on because you don't want the fuel pump running without the car running. If you listen closely at the fuel tank, you should hear the pump run for 2 seconds when you turn the key to "ON"
When the key is turned to "START", the fuel pump should run continuously.
The engine computer tells the fuel pump to shut off if the engine rpms are zero.
So, I would check the switch side of the relay. Power amd ground.

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