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Unread 11-14-2006, 05:16 AM   #1
jeep795
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1992 YJ Wrangler 
 
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Location: warren, ma
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fuel pump won't work

so after i put my gas tank in the back, i can't get the jeep to start anymore. it would crank and crank, and the fuel pump would turn on, but nothing would turn over. i got a new tank and sending unit put in, and now the pump won't turn on, i was assured the pump was working before, so i'm at a loss... i checked the fuse, and ohmed out the coil side of the relay. that part seemed good, plus i switched the relay and put it in place of the ignition one, and it still cranked so, it's fine. but any ideas on what to check before i go and spend 130 bucks on a pump?

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Unread 11-14-2006, 05:56 AM   #2
finwrangler
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check that wiring is correct at the pump. i had problems connecting wires correctly, pumps looks the same, but polarity can be different.
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Unread 11-14-2006, 10:32 AM   #3
jeep795
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the first thing i did was to check the harness. other then that i haven't really looked at too much else. i wire brushed a little bit of the rust that was on the ground but that's it. the wires are even the same colors as my old one.
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Unread 11-14-2006, 11:27 AM   #4
hulken
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did you prime the fuel pump?
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Unread 11-14-2006, 01:18 PM   #5
PhilipJ
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Quote:
Originally Posted by finwrangler
check that wiring is correct at the pump. i had problems connecting wires correctly, pumps looks the same, but polarity can be different.
This happened to me when I had to replace my pump. I oriented the new one the exact same way as the old one... positive on the left, nozzle high in the middle and negative on the right. It wasn't until I had to drop the tank again and yank it out that I realized, after prying back the bushing, that the polarities were swapped.

A quick way to check is to loosen the hose clamps on the tubing from the tank where they meet the hard lines that go to the fuel filter. Half a crank will tell you whether you're getting fuel or not.
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Unread 11-14-2006, 07:07 PM   #6
leftlanetruckin
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i had to ground my fuel pump/sender unit to the body. apparently the ground had corroded somewhere, and was just easier to run a new ground. i ran a wire from one of the bolts on the sender unit to the body....just a suggestion
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Unread 11-19-2006, 11:57 PM   #7
finwrangler
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hey there should be a ground wire at the hand brake attachment, and if its not grounded, car wont start. so check your hand brake (e-brake), if there is loose o-head wire, connect it to hand brake bracket.
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