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Old 07-28-2016, 11:57 PM   #1
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Genset Fuel Filter


My fuel filter seems to be leaking where it threads into the 90 degree brass elbow. I have tighten it several time and still seems to have a slight leak. Is it okay to put thread tape on the filter's thread? Hate to buy a tube of dope just for one time use, as the dope as an expiration date. Any suggestions. Thx
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Old 07-29-2016, 12:28 AM   #2
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No problem using Teflon tape as long as your careful not to get any above threads.

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Old 07-29-2016, 09:44 AM   #3
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Most fuel system vendors do NOT recommend it, due to the risk of getting bits of the tape sheared off and plugging a tiny fuel orifice somewhere, e.g. a carb or injector. It's fairly easy to mess up, especially for amateurs. A paste type is safer, but the teflon is usable as long as you are careful.
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Old 07-29-2016, 10:25 AM   #4
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That really shouldn't leak there, check and make sure that it's not leaking where the nipple is crimped onto the filter. Onan had some bad crimp jobs resulting in many filters leaking. Jim
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Old 07-29-2016, 03:41 PM   #5
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Onan had problems with the fuel filter at the carb. There are (or should be) two filters in the system. Onan's fix is to eliminate the filter at the carburetor. They have a special fitting for that. Talk to your Onan dealer for the part and you can replace it yourself. I had the same problem on mine. Worked great.
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Old 07-30-2016, 11:47 AM   #6
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I removed the overpriced Onan filter and tossed it. I replaced it with a 1/8 NPT thread nipple which uses a 1/4" fuel line. I ran new line as far as I could from the fitting to the tank line. I installed a new filter (NAPA 3011) in the line. This is a plastic see through filter much larger than the original junk Onan used. I also used good quality gear clamps for the connections.
On the nipple I used Teflon tape. The trick is to wrap the tape starting about 2 threads down from the end. Hold the fitting in one hand and while looking at the threads wrap the tape in a clockwise direction. Pull the tape snugly as you wrap it. I believe I made 3 - 4 wraps. After you install the fitting push the prime switch until you hear the pump change it's tone and check for leaks before starting the generator.

2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
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