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Old 07-05-2009, 07:11 PM   #1
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Fuel pump problem...i tried alot of things

1990 jeep 4cyc carb
My fuel pump stopped working then started then stopped..
I tested the power back and it was the problem. I rewired it and now have 12v back to the the pump... still no go..
changed the relays, changed the pump.... the pump is the 2nd brand new one... so the chances of getting 2 faulty pumps are not good plus the old one was only 2 years old....

any ideas?

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Old 07-05-2009, 09:39 PM   #2
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If you've got power to the pump then it's either a bad ground or a bad pump.
I went through 3 pumps in my grand cherokee, first 2 I tried were bad.

ETA: are you sure you wired it right?

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Old 07-05-2009, 09:39 PM   #3
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can you hear the pump running?

if you remove the fuel lines at the TB, does fuel come out when you turn the key on?
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Old 07-05-2009, 09:47 PM   #4
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Quote:
Originally Posted by skeeter View Post
If you've got power to the pump then it's either a bad ground or a bad pump.
I went through 3 pumps in my grand cherokee, first 2 I tried were bad.

ETA: are you sure you wired it right?
all true. if there's power at the pump, and ground, and no pumpy, the pump is bad. so if there's power, make sure your ground is good.
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Old 07-05-2009, 11:20 PM   #5
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What brand pump are using? If it's a airtex pump return it get your money back and buy one that isn't. Airtex also makes pumps for other companies you can tell who makes it by the sticker on it.
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Old 07-07-2009, 04:48 PM   #6
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how would i still be getting 12v if its a bad ground?
It is wired correct.
The pump is not running... how do i test the pump without?
Pump is a Master E7001 i bought it at my local Auto Zone.
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Old 07-07-2009, 07:17 PM   #7
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Your tester doesn't require a good solid ground to read 12v, your pump does. If you've got a broken wire, a corroded connection at the frame or a loose connection at the pump it could be making enough connection for a reading but not enough to flow the amount of juice the pump requires.
Do you have a fuel pressure tester? If not Harbor freight has a cheap one that works.

Run a new ground wire from the ground on the pump to a clean spot on the frame. If it starts working then you had a bad ground, if not then run a wire directly from the battery to the power lead on the pump. If the pump doesn't run or puts out too little pressure then your pump is bad.

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