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Unread 08-28-2013, 01:33 PM   #1
tom_sprecher
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1991 YJ Wrangler 
 
Join Date: Dec 2012
Location: Marietta, GA
Posts: 411
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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Unread 08-28-2013, 01:43 PM   #2
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,697
The impellor on the pump is hosed in some way. Appears to me that you need a new pump.
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Unread 08-28-2013, 02:22 PM   #3
Old4X
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1990 CJ7 
 
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Location: Ga
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2004 predates alcohol. Your rubber impeller is goo from sitting in old fuel.

New pump is the answer.
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Unread 08-28-2013, 03:32 PM   #4
tom_sprecher
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1991 YJ Wrangler 
 
Join Date: Dec 2012
Location: Marietta, GA
Posts: 411
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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Unread 08-30-2013, 08:42 AM   #5
tom_sprecher
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1991 YJ Wrangler 
 
Join Date: Dec 2012
Location: Marietta, GA
Posts: 411
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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