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Unread 01-17-2010, 03:29 PM   #1
jmpunited9
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1974 CJ5 
 
Join Date: Oct 2009
Location: Atlanta
Posts: 37
1975 CJ-5 not getting fuel

Hey guys. My buddy drove his jeep about 4 weeks ago and it was running like a champ (and has been), but after garaging it for the past month it is now no longer getting fuel. Here is what we have tested:

Previous to driving it 3 months ago we tested the pump and it was puming out fuel fine. It was filling a clear coke bottle in seconds (16 oz). My question is....do fuel pumps break over time or do they just all of a sudden stop working like this during storage. Is there anything else it can be? I was thinking that there may be a crack in the fuel line somewhere, but will that small amount of air getting in the fuel lines prevent the pump from pumping out fuel at all? We currently have the line disconnected BEFORE the fuel filter, so i am 100% sure its not the filter. The end of the line is sitting in a clear coke bottle and not a single solitary drop of fuel is coming out. And yes....the gas tank is full.

Is there anything else I should be checking before jumping to the conclusion that the fuel pump just magically broke while sitting still in a garage for 4 weeks? Is there maintenance that can be done to fuel pumps? can they clog?

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Unread 01-17-2010, 04:09 PM   #2
retrofit9
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1979 CJ7 
 
Join Date: Dec 2009
Location: Chesterton Indiana
Posts: 84
Yea the fuel pumps go bad just like you are saying. Mine did the same thing a few years ago and the fuel pump was'nt that old either. I let it sit over a winter and the diaphram went bad. I thought it had to be somthing else to since the pump was only a few years old. Changed it and it fired right up. Easy fix at least lol.
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Unread 01-17-2010, 04:20 PM   #3
jmpunited9
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1974 CJ5 
 
Join Date: Oct 2009
Location: Atlanta
Posts: 37
was the fuel pump replacement difficult/labor intensive? I am yet to have to do one on a CJ
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Unread 01-17-2010, 05:15 PM   #4
Aduffy32
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1998 TJ Wrangler 
 
Join Date: Aug 2009
Location: Tucson, Arizona
Posts: 309
I used my electric pump to drain my tank. I must have overworked it because it just suddenly stopped working.
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Unread 01-17-2010, 05:28 PM   #5
retrofit9
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1979 CJ7 
 
Join Date: Dec 2009
Location: Chesterton Indiana
Posts: 84
If its a mechanical fuel pump on a 258 I-6 its very easy. There is a fuel line in and a fuel line out and two bolts that hold it to the block. You'll need a new gasket with the new pump and some non hardening permatex. Scrape the old gasket matieral off the block after you remove the old pump. If I remember, the bolts holding the pump on the block are 7/16, so you'll need a 1/2" wrench for those and a 1/2" line wrench for the gas line to the carb. Brian.
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