Fuel System Problem - JeepForum.com

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post #1 of 3 Old 01-31-2014, 07:43 PM Thread Starter
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1989 FSJ Wagoneer 
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Fuel System Problem

My 89 Jeep Grand Wagoneer is starved for fuel. I just changed the fuel sending unit and fuel filter. I am considering changing the fuel pump. Anyone have any suggestions if the fuel pump does not fix the problem?

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post #2 of 3 Old 02-01-2014, 04:51 PM
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2006 LJ Wrangler 
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change the fuel pump 1st... then go from there. the pumps wear out. it happens.

if it isn't that, you may have carb issues, be it debris, bad valve, bad pump, blown seal, blocked passage etc....

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post #3 of 3 Old 02-01-2014, 08:17 PM
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I would check your fuel line at your tank. I am not real familiar with the big body jeeps but most likely your jeep will have some type of rubber line leaving the tank from the fuel pick up to a hard line on the frame. All it takes is as small crack or even a pin hole to introduce a small amount of air into line resulting in fuel pump to struggle delivering fuel. I assume that your pump is mechanical? The sender should not have anything to do with the pump. The sender tells gauge how much gas is in the tank. I would pull your fuel line off the carb and fill the float bowls fith gas and see how it runs. Normal idle and smooth running will eliminate the carb. Never a bad idea tho change the filter, I would do this first. If it runs poor you have eliminated carb and can assume filter is good being that it is new. Pump line and tank remain. Cheaper to buy 12 to 14 ft of 5/16 or 3/8 hose and run from pump to tank just hook up and let it lay on the ground. Even disconnect fuel line at both ends and force air through with a compressor. Have someone hold a clean rag over end by motor to catch any trash that may cause obstruction. Do these few things before buying parts. I have spent a fortune, dropped enough F bombs and G. D's to send 100 men to hell buy buying parts to repair one simple thing by replacing four or five.both ways are process of elimination only trouble shooting saves you the trouble of being broke from replacing part that where in working order and not the root of your problem. Just my thoughts, for what they may be worth. Good luck with it.
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