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Old 03-12-2022, 11:37 AM   #1
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Model: Quantum JM31
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THOR #21926
Problem fueling - slow flow- constant pump shut off - what I found

The last few times we have used the motorhome we had difficulty filling the fuel tank and the pump would keep shutting off if we did not barely deliver the fuel. Yesterday I decided to investigate the problem and this post is about what I found. Thought it might helps others with a similar problem. If you look at the attached photo you can see that the main fuel line and the vent line from the fuel tank are connected to the fuel port using rubber hoses. Both these hoses were seriously kinked. It is my belief that when we picked up the motorhome they were not kinked but were under stress and over time developed the kinks. When we purchased the coach we did not have a problem but overtime it has developed and now is to the point where it cannot be tolerated. The solution was to loosen the clamps and take a screwdriver and break the hoses loose so they would slip down the pipe. We then re-tightened the clamps. Have not been out to a fuel station yet but I feel confident there will be a significant improvement.
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Old 03-12-2022, 12:13 PM   #2
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Originally Posted by Bob Nodine View Post
The last few times we have used the motorhome we had difficulty filling the fuel tank and the pump would keep shutting off if we did not barely deliver the fuel. Yesterday I decided to investigate the problem and this post is about what I found. Thought it might helps others with a similar problem. If you look at the attached photo you can see that the main fuel line and the vent line from the fuel tank are connected to the fuel port using rubber hoses. Both these hoses were seriously kinked. It is my belief that when we picked up the motorhome they were not kinked but were under stress and over time developed the kinks. When we purchased the coach we did not have a problem but overtime it has developed and now is to the point where it cannot be tolerated. The solution was to loosen the clamps and take a screwdriver and break the hoses loose so they would slip down the pipe. We then re-tightened the clamps. Have not been out to a fuel station yet but I feel confident there will be a significant improvement.
Good catch. Thanks.
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Old 03-12-2022, 01:01 PM   #3
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That is a serious kink in the fuel hose.


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Old 03-12-2022, 01:36 PM   #4
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There are quite a few posts about this issue as well as folks experiencing the blame game between Ford and Thor. This is the first, I believe, with pics of the issue and a DIY fix

Thanks for the post.
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Old 03-12-2022, 07:41 PM   #5
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Bob,
I also had the kink problem, but on my def filler. Same pic as yours, kinked.
I loosed it clamped it and put a collar around the kink, magical, easy to fill now. As you stated, my problem developed over time.
Interesting on why this happened.
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Old 03-12-2022, 09:01 PM   #6
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Thor should not release anything from the factory without checking. PERIOD!
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Old 03-13-2022, 12:32 AM   #7
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Bob - good sleuthing my friend!
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Old 03-13-2022, 12:59 AM   #8
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Thor should not release anything from the factory without checking. PERIOD!
Maybe they should but few could afford the extra labor even at the current Thor MC labor rate of $22 per hour plus medical. Beside Thor MC pays the dealer to do the quality PDI and supplies them with the items to be check before delivery. I guess the dealer did not get around to checking the fuel vent hose.
Actually, the current gasoline softens and expands most rubber hoses. That is why Gates offers their Green Label barrier fuel line for twice the cost of standard fuel hose. Anything in fuel that is called a detergent is also a solvent.

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Old 03-13-2022, 01:18 AM   #9
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Thor should not release anything from the factory without checking. PERIOD!
OP stated I the initial post that there didnít seem to be an issue earlier but developed over time. Thor canít repair problems that donít exist at the factory.
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Old 03-20-2022, 03:32 AM   #10
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Does anyone remember years ago they would put a coil in radiator hoses to prevent that from happening, I would imagine the same could be done for the fuel filler if you could find a coil to fit? Then you’d never have to worry abound it again… Might need it to be stainless steel though??
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Old 03-20-2022, 03:19 PM   #11
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MSdpok

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Old 03-20-2022, 03:58 PM   #12
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Thought I had the same problem, At the truck pump I would need to go slow to fill up. Then once I opened the other cap on the other side and I can fast fill. after reading this post I got up under and looked to see if I had a kink. Nope,
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Old 03-20-2022, 04:05 PM   #13
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Originally Posted by First RV 4 me View Post
Thought I had the same problem, At the truck pump I would need to go slow to fill up. Then once I opened the other cap on the other side and I can fast fill. after reading this post I got up under and looked to see if I had a kink. Nope,
Sounds like a vent problem to me. Having kinked or clogged vent lines do the same thing as kinked fill lines.
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Old 03-20-2022, 08:35 PM   #14
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MSdpok

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Welcome!
Hey last month I was 25 and still stupid! This month Iím 60 and frugle!! Lol
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Old 04-02-2022, 10:41 PM   #15
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Great picture of the issue above and annotation! I have same issue on my ACE from Aug 21 posting, its very tight up there with my fuel line against the Gen and fuel tank. I can't get a wrench or socket to loosen clamps and refit the hose. I decided to buy a worm clamp and wrap it around the kink and as i tightened the clamp, the hose formed into a round cylinder. i don't compress the hose, just get it back to round.

If you look closely the fuel line from the filler port to the metal tube going to the tank actually goes up hill a little. (2nd picture). I think this inhibits the fuel flow to the tank. If i park at the pump down hill this doesn't happen.

I've gotten used to filling with an Funnel, but takes a while to get 40 gals in there at a slower rate.
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Old 04-03-2022, 02:44 PM   #16
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Bob, thanks for your post, i decided to go out and inspect RV this morning again, because, after fixing the flex hose near the fill port the issue came back. What i found is fwd at the flex hose going into the fuel tank thru a body frame. It looks like the entire fuel hose and metal tube sagged over time, the entire fuel run now sags and causes a kink in the flex line to the tank. No wonder fuel is shutting off, the fuel is probably backing up to the fuel nozzle and shutting off the pump.

I will need to figure out how to install a hanger from the floor and support the fuel line run from that point, and raise the entire tube up. Maybe something like a hanger exhaust bracket or something and a clamp might work...

Many folks have posted concerns on this issue. Is this something i should send to THOR technical support?
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Old 04-03-2022, 07:00 PM   #17
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I checked the fuel line going into the tank, the flex hose is kinked permanently so i attached a worm clamp around the crease and rounded out the tube. I removed the metal elbow from the hose and re-seated as far in as it could go. Then moved all the lines up and secured them to the underfloor with multiple tie wraps.

Now all the fuel will flow down hill from the nozzle and flow un restricted into the fuel tank. That is a very tight squeeze in there and prefer time spent inside the RV...

Hope this helps! I will report back on my next fueling event.
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Old 04-03-2022, 11:08 PM   #18
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The finished product, all secure, corrosion painted, looks good, I hope the fuel flows un restricted. I think the issue is the amount of vibration back in the tail end of the RV. In previous postings i have shown my Gen Exhaust bracket broken, The fuel line tubes were free floating, putting all the stress to hold up fuel manifold on the flex hose. This might have worked for a few months, but after a yr of driving, everything is nice and tight now. .
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Old 04-04-2022, 02:04 PM   #19
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I appreciate all the details and pictures. I too have this issue. Seems I will be adding this to the list to check before our next trip!

RV maintenance is a full-time job!
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Old 04-06-2022, 05:40 PM   #20
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Ok i went out and re-fueled today. Flow is un restricted with Parkers fuel pump full open. Nice!

Slid underneath, no leaks, kinks, and all is secured. ....
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