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Feb 2, 2012 | 03:21 PM

coonbottom

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need help

put new gas tank and fuel pump in today and fuel pump wont turn on.. what should i do?

Feb 2, 2012 | 03:50 PM

bashby

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From: Charles Town, W bygod Va

Did it run before you worked on it?

Feb 2, 2012 | 03:51 PM

bashby

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From: Charles Town, W bygod Va

We also need to know what you're working on.

Feb 2, 2012 | 05:09 PM

coonbottom

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Quote:

Originally Posted by bashby

Did it run before you worked on it?

no it didnt, i was driving down highway going about 55 and it just shut off on me and wouldnt start back up. alternator and battery are good.

1990 F-150 with the 5.0

Feb 2, 2012 | 05:15 PM

bashby

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From: Charles Town, W bygod Va

Check the inertia switch, it shuts power to the pump in a crash but they can trip sometimes. I'm not sure where it is on your truck..its a white box about 1" square and I think its under the dash, pass side. might have to pull the carpet back to see it. Do you have a test light or voltmeter?

Feb 2, 2012 | 09:38 PM

732t37

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From: Monmouth County, NJ

I know sometimes the gasoline eats the wiring harness that sits on top of the tank. If the pump wiring is getting voltage check that. You don't have to drop the tank, just loosen the screws on the strap and you can reach it.

Last time I replaced my pump the new one had 2 same-color wires and I got the polarity wrong. Took me ages to figure it out cuz the pump still made the whining noise, just didn't move gas. I know that's not your problem, I just felt like sharing.

Feb 3, 2012 | 10:11 AM

coonbottom

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Quote:

Originally Posted by bashby

i checked inertia switch and it was fine. was told to check relays but my hanes book shows me there under the hood but their not..

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Feb 3, 2012 | 09:04 PM

732t37

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From: Monmouth County, NJ

Where was it?

Feb 3, 2012 | 10:02 PM

#10

coonbottom

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Quote:

Originally Posted by 732t37

Where was it?

Under hood.

Feb 3, 2012 | 10:35 PM

#11

732t37

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From: Monmouth County, NJ

They're pretty hard to find sometimes. Little black box with a black cover full of black relays sitting in an engine bay full of grease, black hoses, and black plastic parts.