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Unread 07-09-2011, 10:17 PM   #1
musclenut
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1982 CJ7 
 
Join Date: Jul 2011
Location: hodgenville, ky
Posts: 72
My new jeep has Two fuel pumps and a bad fuel gauge

My new cj came with a few fuel issues. The P.O. put a new poly tank and sending unit on it. He said the fuel gauge hasn't worked since. He also had to install an electric fuel pump afterwards because the fuel line seemed to loose prime and was hard to start. This jeep has a mechanical and a electric fuel pump. Is that bad? I have noticed the fuel line fitting that attaches to the mechanical pump weeps gas. I replaced the line but still leaks. I think the fuel pump fitting is damaged. Could this leak be the reason why the PO installed the electric pump? It runs great right now! Thanks!

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Unread 07-09-2011, 11:11 PM   #2
Dudman5703
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2001 TJ Wrangler 
 
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as for the fuel gauge:
http://street2mud.com/webfiles/Basic...J%20gauges.pdf

sorry I don't know much about fuel pumps...
but if for some reason my fuel pump wasn't working right I wouldn't cobble together like that I'd go ahead and fix it, or upgrade.
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Unread 07-10-2011, 11:43 AM   #3
musclenut
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Thanks Dudman, that's a great link. I'm having to reverse engineer every thing that's been done to this jeep to fix it correctly.
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Unread 07-10-2011, 12:53 PM   #4
jcal73
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1979 CJ5 
 
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Location: Alabama Roll Tide
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Quote:
Originally Posted by musclenut View Post
I'm having to reverse engineer every thing that's been done to this jeep to fix it correctly.
Ain't we all!

Check all the rubber hoses and make sure that they are in good shape and securely fastened.


Jeff
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Unread 07-10-2011, 03:31 PM   #5
Lordwrench
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1978 CJ7 
 
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also, ethanol fuel eats the older rubber lines from the inside out. If you have an electric pump, bypass the mech pump,the return line to the tank from your fuel filter will return the excess to the tank from the electric,or u could get a pressure regulator if you want.I don't have one now. There's no need for two pumps,choose one and go with it also make sure your filter is oriented like this,and the tank is vented properly to prevent a vacuum in the tank.If the vent line on the filter is not on the top,it will cause the "fuel line seemed to lose prime" issue.If he replaced the gauge sending unit, he may have bought one of the garbage replacement units flooding the market and its bad,or he likely didn't rework the ground properly
fuel-filter-orientation.jpg  
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Unread 07-10-2011, 05:10 PM   #6
musclenut
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1982 CJ7 
 
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Location: hodgenville, ky
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Quote:
Originally Posted by Lordwrench View Post
also, ethanol fuel eats the older rubber lines from the inside out. If you have an electric pump, bypass the mech pump,the return line to the tank from your fuel filter will return the excess to the tank from the electric,or u could get a pressure regulator if you want.I don't have one now. There's no need for two pumps,choose one and go with it also make sure your filter is oriented like this,and the tank is vented properly to prevent a vacuum in the tank.If the vent line on the filter is not on the top,it will cause the "fuel line seemed to lose prime" issue.If he replaced the gauge sending unit, he may have bought one of the garbage replacement units flooding the market and its bad,or he likely didn't rework the ground properly
I went out and looked at my fuel filter it's upside down. The PO mentioned something about a wire on the sending unit he didn't hook up. He thought it might be a ground.

Which is better a mechanical or electric fuel pump? One thing I don't like about the electric is if you turn your key on for lights or radio it's humming under the hood.
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Unread 07-10-2011, 08:38 PM   #7
Lordwrench
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Posts: 464
when u turn ur key on,ur also working on burning up the ignition module and/or coil. mine came with the electric,i dont see the point on a stock motor,it ran fine on mechanical all these years. an electric needs to run through an oil pressure switch as well,so it doesnt run unless the engine is turning,which will keep it from pumping gasoline onto you and the family in a post accident fire.
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