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Old 01-24-2023, 03:43 PM   #1
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Fuel Filter replacement on C-Series 6C8.3

The manual says to prefill the new filter (FS1251 filter). It also says to clean the filter gasket surface on the engine. This all makes sense but from reading other posts it seems you better move fast to replace the filter so air doesn't get in the system. How do you clean the gasket surface fast enough that wouldn't let lots of air in? Or is this for a different Cummins engine?

I'd appreciate any advice.



Thanks,
Jeff


'98 Monaco Dynasty 40' - C-Series: 6 C 8.3 Engine Turbo
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Old 01-24-2023, 04:01 PM   #2
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Had a similar challenge. My mechanic said to turn the ignition switch on 5 or 6 times without starting. Make sure you leave it on for 4 or 5 seconds each time. This will pump fuel into your filter to eliminate air in your lines. Once you go to start you’ll be good to go. Did exactly what he said and thousands of miles later still no issues. I have a Cummins 450.
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Old 01-24-2023, 06:45 PM   #3
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Jeff, I'm guessing since you didn't post how to change filter on a ISC 8.3 yours is a mechanical engine...best I can tell you is:

Have your new filter filled with fuel and close by.

If you pour fuel in through the smaller holes, it's filtered.

Once you get the old one off, make sure you replace the o-ring.that maybe on the threads of the filter base. Some have them, some don't.

A quick swipe with a rag on the base will get it clean enough, thread on the new filter and tighten as much as possible by hand.

Most important, where a ragged old t-shirt as the fuel will probably be running down your arm during most of this!

If not, then it'll be pulling some air back though line to tank. So yep, work steady

Your older mechanical engine can be hard to prime, so once you start it, hold the throttle about 1/2 way for several minutes to get any air out.

If it loses prime, remove filter and start over, you may have to looosed a few injector lines to get it stumbling enough to start.
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Old 01-25-2023, 02:45 PM   #4
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Yes, it's a manual C Series engine. Thanks for the advice.
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