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Old 09-07-2015, 03:29 PM   #15
Rivet Master
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
Originally Posted by woodytwo View Post
May have stumbled upon the solution.
Did a google search and found several RV forums with similar posts.

Problem may be with the vent tube. Apparently all/most chassis have one. comes out of the top of the tank runs along the filler tube to a "T" near the top of the filler tube. overfilling can cause gas to be in the vent tube that gets trapped in a type of "P" trap by a low spot in the vent hose. Gas cannot drain back into the tank and air cannot go up the vent so air goes back up the filler tube causing auto shutoff to click off.

Solution seems to be to realign the vent tube to ensure there are no low spots and drain away gas in vent tube. Several owners did this and the problem went away.

Seems reasonable to me in that I believe that the gas tank is right up between the main chassis rails and filler and vent line would have to be horizontal at some point to fit under the floor and get to the top of the gas tank.

I'll have a look and follow up on findings later.
It is common to have the vent line slip, sag or otherwise develop a problem so if gas gets in it, it forms a trap blocking the air from being able to be vented from the tank. On my 310 I found that the original ties which held the vent to the large fill line had slipped allowing the vent to not ride on top of the fill line, form a pocket and prevent a rapid fill. Once I corrected that, the problem went away, so I would say this well could be the issue on yours. Route the vent line so it is a always going down to the tank so no liquid can accumulate in it.

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Old 12-16-2015, 03:57 PM   #16
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comprose's Avatar
1999 31' Land Yacht
Kingston , Washington
Join Date: Mar 2015
Posts: 133
Originally Posted by woodytwo View Post
So does the 2005 have a vented tank???
How about a 1999 30' Land Yacht MH, does it have a vented tank? I have the same issue and always afraid of topping off and spilling gas all over the place.


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Old 12-16-2015, 06:35 PM   #17
Rivet Master
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
All gas tanks car, truck, diesel etc.(as well as water tanks in RV's) have to be vented so the air or fumes in the tank can come out as you fill the tank. The liquid pushes the air or vapor out, otherwise it cannot go in.
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Old 12-29-2015, 01:34 PM   #18
3 Rivet Member
2000 31' Excella
Ontario , Canada
Join Date: Feb 2010
Posts: 180
problam resolved????

Follow up

Checked vent tube and it looked in the right location.

just finished a 1500 mile trip and low and behold no problems. I was able to use the fuel flow stops. If anything was different, it may be the fact that I didn't put the nozzle as far into the filler pipe as I normally do.
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Old 12-29-2015, 03:05 PM   #19
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1972 23' Safari
2005 30' Land Yacht 30 SL
Miamisburg , Ohio
Join Date: Mar 2006
Posts: 34
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Woody, My 2005 does the same thing, but not at all times. If you find that it is the vent tube let us know. I have seen this thread on this forum before but have never chased down the problem myself.

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