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A Problem Adding Gas to Tank

by David Woolf
(Fort Worth,TX)

Q. I have a 99 Damon. When adding gas to the tank (say 40 gals.), the first half goes in fine. The last half has to be pumped very slowly as the gas foams up in the pipe. This can take as much as 20 to 30 minutes. I have checked the pipe and vents and found nothing wrong.

I have been told at several stations in a number of states that the government requires an additive to make the gas foam. Is there a device or modification that will break up the foam?

Marianne's Reply: Yikes! Fueling is painful enough these days without that added aggravation! I'm afraid this is beyond my or Randy's limited knowledge but I can't imagine that your problem is because of something added to the gas. If it was, wouldn't everyone encounter the same problem? I do have 3 suggestions for you:

1. Perhaps one of my readers can help. If not, someone on one of the RV forums may be able to answer it. There are many RVers out there who are more than happy to share their knowledge.

2. Since yours is a mechanical problem, it's not just related to RVing. I just googled "slow filling gas tank" and came up with several websites that offered advice. I only read one or two but they seemed to indicate something blocking the fuel line or vents as the likely problem. You could google further down the list for other suggestions.

3. Since you've already checked the lines and venting, maybe you will end up having to ask a mechanic for advice. If you're on the road, a great source for free mechanical advice is at an auto parts store like Napa, Checkers, Auto Zone, etc. These stores are usually staffed by people who are knowledgeable and sometimes even part-time back yard mechanics. If they can't help you, they can recommend who you should go to in the area.

Has anyone reading this post encountered the same problem and can you offer David some further advice?

Comments for A Problem Adding Gas to Tank

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Mar 22, 2011
Rings a Bell for Sure
by: picwick

Our Majestic had the same issue. It once took me nearly 20 minutes for 20 dollars worth at 90 cents a litre !! This happened after we had traveled a very rough & windy road for about three hours. We had bounced up, down and both sides many times over the course of this so-called shorter route! Anyway, when it was time to gas up,my problems began and lasted throughout the trip until we finally got to our destination & I was able to counter attack my problem. It turns out the vent pipe had a sway deep enough to trap enough gas in it to block the air passage. The "shorter route" did this I'm sure!!

We had to cut into the hose, gas spewed out, and we shortened it enough to reconnect and it never happened again!! We also never took that shortcut again! lol

Dec 07, 2009
Slow gas filling
by: Jim G.

I had a similar problem with my Bounder Class A which had a gas fill on the rear of the coach. I did not have the "foaming" problem, only very slow filling. I found that if I extended the back leveler jacks to raise the rear of the coach this allowed a better flow. If your fill opening is on the side, extending that side's leveling jacks might help. Good luck!

Dec 07, 2009
Fill Slower
by: Anonymous

I have noticed this in all my vehicles because I like to fill the tank to the very top. That way I know that my calculations are always for an exactly full tank. I attribute the problem to the speed that the gas is flowing into the tank. Try slowing the flow of the gas and there should be much less foaming. If you do get lots of foam, stop and wash the windows (or do something else for a minute) while you wait for it to settle. When you resume you should be able to fill uninterrupted for a while longer.

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