Fuel Pump Not Pumping - JeepForum.com
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post #1 of 5 Old 08-28-2013, 01:33 PM Thread Starter
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1991 YJ Wrangler 
Join Date: Dec 2012
Location: Marietta, GA
Posts: 632
Fuel Pump Not Pumping

After putting 5 gallons of gas in the tank and trying to crank the jeep for the first time in 8 months I have a fuel delivery problem. The tank was off and the fuel sender was inspected back in April. I cleaned the sender rheostat and replaced the short hose between the pump and the output tube. I did not replace the pump since it had a 2004 date code on it and was working fine at the time.

Today I hook the pump directly to a spare battery and can hear it running, but no gas comes out of the fuel line before the filter. Took the power off and applied compressed air to the fuel line. I could hear it bubbling inside the tank. Having forgotten to remove the gas cap, fuel rushed out of the line because the tank was pressurized. Guessing there is not pinched hose or obstruction I applied power and still no flow.

Any ideas?

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post #2 of 5 Old 08-28-2013, 01:43 PM
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1995 YJ Wrangler 
Join Date: May 2011
Location: Baltimore
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The impellor on the pump is hosed in some way. Appears to me that you need a new pump.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
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. It started with a $200 axle, and a few thousand dollars later I was done :)
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diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #3 of 5 Old 08-28-2013, 02:22 PM
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1990 CJ7 
Join Date: Nov 2008
Location: Ga
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2004 predates alcohol. Your rubber impeller is goo from sitting in old fuel.

New pump is the answer.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #4 of 5 Old 08-28-2013, 03:32 PM Thread Starter
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1991 YJ Wrangler 
Join Date: Dec 2012
Location: Marietta, GA
Posts: 632
I was afraid of the impeller being fried, but was hoping for something easier. At least everything is clean and all the rubber is new. The tank should drop pretty easily.

Looks like a pump kit is $68 at NAPA.

Thanks guys.

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post #5 of 5 Old 08-30-2013, 08:42 AM Thread Starter
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1991 YJ Wrangler 
Join Date: Dec 2012
Location: Marietta, GA
Posts: 632
I'm an idiot. After replacing the pump, sock and filter it had the same symptoms. Lying there under the Jeep wondering what I had overlooked I realized the supply and return lines at the tank were reversed.

On the plus side I modified the rear frame rail so when dropping the tank it does not get hung up on the tank strap ends.

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