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Old 06-17-2015, 05:20 AM   #1
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Thread Sealer on Fuel Filter of Cummins Onan Generator

Most of the pictures that I see of a new fuel filter, show a red substance on the threads where it screws into the fuel pump. The one that I purchased, even though it was an OEM filter, didn't have any sealer on the threads. It did have a removable plastic cover to protect the threads until installation.

Is a sealer needed, or is it a compression seal?

Thanks for the help!
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Old 06-17-2015, 05:52 AM   #2
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Fuel filter thread sealant!

If the filter in question has an "O" ring to seal each end then no sealant is needed. Some filters seal by a tampered seat. If you feel it's safer to use a sealant you can use teflon tape, I've used it for this purpose for many years with no problems.
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Old 06-17-2015, 02:18 PM   #3
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I would be loathe to put anything on like teflon tape, I know the previous poster has said that he did it. If you have any of the tape get off and go into the fuel system you might have problems. On my cummins it has a o ring on the fuel filter you do not need to worry about the threads.
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Old 06-17-2015, 08:30 PM   #4
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Quote:
Originally Posted by BPoland View Post
Most of the pictures that I see of a new fuel filter, show a red substance on the threads where it screws into the fuel pump. The one that I purchased, even though it was an OEM filter, didn't have any sealer on the threads. It did have a removable plastic cover to protect the threads until installation.

Is a sealer needed, or is it a compression seal?

Thanks for the help!
You didn't say what model generator you have. I'm guessing it's the 5,500 watt air cooled model.

If it is that model it sounds like you may have gotten an older filter. The latest generation comes with the red (rust colored) thread sealer. The older ones didn't. Teflon tape is an acceptable solution. If you use it be careful to keep it off the first couple threads. The other caution is to wrap it so it tightens against the threads when you screw it into the fitting. If you wrap it the wrong way it could just unravel as you screw the filter into the fitting.
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Old 06-18-2015, 05:08 AM   #5
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Thanks guys. I looks like I have the older model, without the sealant.
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Old 06-18-2015, 06:39 AM   #6
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I just had my generator serviced at the Onan dealer and they put on a new fuel filter. There was no thread sealer on the threads. They used a teflon paste which was white. I picked up an extra filter and it didn't have the red sealer on it either. They advised me to use the teflon paste and not to use teflon tape
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