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Unread 02-02-2013, 11:32 PM   #1
Digital10
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82 wagoneer fuel pump problem?

The jeep cut out about two block after putting in a full tank of gas...everything would turnover, but no gas was getting to the carb...the electric fuel pump on the frame driver's side made a loud humming sound. Wait half and hour and it starts right up...drive it home with no problem. Here is the problem...my dad and I pull the trigger too fast and get a new fuel pump, change it out, and she starts again...back it out of the garage and she dies. We check the electric wiring from the pump to the jeep looks okay. Nothing at all. Switch out the new pump with the old one...nothing. Both pumps test out just fine when we hook them up to a meter...any ideas? Help?

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Unread 02-03-2013, 06:49 AM   #2
vanaisa
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blockage in tank, fuel lines or blocked fuel filter.
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Unread 02-03-2013, 07:24 AM   #3
olliehopnoodle
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Are you sure it's fuel? These things are known for bad ignition modules. Often times they don't just 'fail' they go intermittent on you.

Check for spark.
With an electric fuel pump it should be easy to check for fuel. Before filter/after filter/in carb (with engine off and no air cleaner pump the gas and see if you get a squirt from the accell pump)
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Unread 02-03-2013, 08:34 AM   #4
Digital10
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No fuel is getting that far...the line from the pump to the filter is basically dry...the ignition turn over just like normal, but no fuel when I pump the gas.
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Unread 02-03-2013, 08:53 AM   #5
CSP
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Another example of why I'm not a fan of low pressure, electric fuel pumps. Go back to mechanical.
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Unread 02-03-2013, 09:22 AM   #6
pleontks
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do you have a prefilter on the pump. that's what clogs on mine. Prefilter, then a week or two later, the engine bay filter.
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Unread 02-03-2013, 02:46 PM   #7
Digital10
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It was a damn fuse...
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Unread 02-03-2013, 07:12 PM   #8
olliehopnoodle
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Well, easy fix at least!
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Unread 02-03-2013, 09:18 PM   #9
Digital10
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Problem is it blows every time I get a block or two away from my house...it's a 10 fuse in the ACC slot...no clue what ACC is, but the car won't run without it....
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Unread 02-04-2013, 06:55 AM   #10
olliehopnoodle
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ACC is for accessory. Whomever wired it picked that one since the circuit is only live when the ignition is on or in the accessory location.

Not a great choice. Your fuel pump is probably drawing close to, if not more than, the fuse rating. You should rewire the fuel pump. I would go with it's own circuit and fuse. Use a relay to control the circuit or, even better, get a oil pressure switch. It will turn off the fuel pump if the oil pressure hits zero (like when the car isn't running). It's an added layer of safety.

Don't just stick a larger fuse in there. The wire feeding that circuit is designed for 10amps. If you put a larger fuse it you will melt the wire (and possibly start a fire)
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Unread 02-04-2013, 11:27 AM   #11
Dr. Marneaus
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Yup, rewire it, run it through a relay, dont run it directly through the fuse box.

power from battery to relay (35amp i think), power from relay to fuel pump, ground the fuel pump wherever. Then run from a 12v source that is only on in the RUN position (you dont need your fuel pump to run in 'acc' when you are trying to listen to your radio without the truck on....also, dont leave your truck in 'run' with the engine off to listen to the radio or use accessories) to trigger the relay.
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Unread 02-04-2013, 01:31 PM   #12
pleontks
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I did not use a relay. works fine. Ran mine through a toggle switch on the dash. Turn it off, and no one's stealin my truck (hopefully)
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Unread 02-04-2013, 02:18 PM   #13
Dr. Marneaus
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i didnt say it wouldnt work fine, but the 'correct' way to do things like this is running through a relay, rather than putting the load through the switch.
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