Would bad sending unit gasket on the gastank cause rough idle? - Jeep Wrangler Forum

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Old 03-20-2012, 03:18 AM   #1
Join Date: Feb 2012
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Would bad sending unit gasket on the gastank cause rough idle?

I got slightly rough idle in my 89 wrangler 4.2. I do know the gas tank seal is bad. I am wondering if that is causing a vacuum leak and resulting in rough idle?

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Old 03-20-2012, 07:57 AM   #2
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A slightly rough idle could be a number of things from vacuum, carb, fuel, etc. Could a bad gasket on the fuel tank cause it. I think it might be something else. Maybe you need a tune up. That gasket should be replaced anyway. Are you leaking fuel?

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Old 03-20-2012, 08:49 PM   #3
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No, a leak at the sending unit gasket will not cause it to idle rough.
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Old 03-21-2012, 08:53 PM   #4
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I have an '89 too.

Do you have the stock carb and ignition? The stock carb is a POS!! Stock ignition is just as bad. Makes a big difference as to where we start to getting the engine to run better.

So; what are we working with?

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