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Old 01-21-2021, 03:27 PM   #1
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Correct fuel filler cap

2002 MADP 4097...I've got fuel run off stains on body and it leaks out...caps look new but probably not right
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Old 01-21-2021, 04:36 PM   #2
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Had the same problem. When tank was full or even slightly above 3/4 fuel would leak out filler caps on both side when driving and especially around curves and corners. Called Newmar and apparently the caps were vented and causing the issue. I was told that the fuel tank was also vented so they sent me 2 non-vented caps and have not had an issue since.
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Old 01-21-2021, 06:12 PM   #3
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Lots of info in here I had a similar problem as have many others.

https://www.irv2.com/forums/f103/fue...-496921-2.html
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Old 01-21-2021, 11:25 PM   #4
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I didn't notice the caulking at first since it was painted same color as coach. I removed cap and re screwed it back on so i hope it's on right...for now I put rag in there to soak up the excess for now.
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Old 01-24-2021, 08:29 PM   #5
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Quote:
Originally Posted by chefred112 View Post
I didn't notice the caulking at first since it was painted same color as coach. I removed cap and re screwed it back on so i hope it's on right...for now I put rag in there to soak up the excess for now.
Did you read the thread, all the solutions are there and none of them require a rag.
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Old 01-24-2021, 09:44 PM   #6
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it was a temporary thing til I can get down and get the right cap and remove the excess caulking...ill read it again, do i need to go deeper and replace the filler too?
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Old 01-25-2021, 08:39 AM   #7
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it was a temporary thing til I can get down and get the right cap and remove the excess caulking...ill read it again, do i need to go deeper and replace the filler too?
These will be the correct caps I tried several that did not fit before finding these exact replacements.

https://www.rrproducts.com/Diesel-Fuel-Cap-product26090

Or you can order them through Newmar but at what cost I do not know.

So for the filler neck it depends on which design you have installed see my pics for verification.

The flanges were installed incorrectly on mine so I had to change 1 of them out

Ted.
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Old 01-25-2021, 02:56 PM   #8
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Don't overfill your tank. That solves the issues.
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Old 01-25-2021, 02:58 PM   #9
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Don't overfill your tank. That solves the issues.
Sorry that is not the issue.

Ted.
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Old 01-25-2021, 04:55 PM   #10
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Solved...bought a locking NON-venting gas cap...
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Old 01-25-2021, 05:52 PM   #11
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Solved...bought a locking NON-venting gas cap...
That is not a good Idea, the tank needs a vent or you can starve your engine of fuel

Air displaces fuel being consumed while traveling.

What you have to be sure of is seal is actually contacting tube or sitting just above it like in my case.

The cap would bottom out on the body/sealer or both and click like it was tight but seal never reached tube.

A small mirror will help you determine contact.

Ted.
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Old 01-25-2021, 06:10 PM   #12
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Ted, ventless fuel caps were spec for a lot of Newmars. Mine included.
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Old 01-25-2021, 07:11 PM   #13
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Ted, ventless fuel caps were spec for a lot of Newmars. Mine included.
Thank you, that may be true but one should not replace a vented with non vented for the reasons I mentioned.

Mine are both vented.
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Old 01-25-2021, 07:29 PM   #14
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I was wondering if mine should be vented. When I drive for 4 or 5 hours before we stop, a while after I will hear the tank expand. If I stop to get fuel, when I take the cap off it sucks a lot of air and the tank pops when it expands. I have a 2004 MA, can anyone tell me if that is normal or should the cap be vented?
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