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Old 07-26-2021, 10:01 AM   #1
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Removed gas cap and gas shot out

I removed my gas cap and gallons of gas shot out of the tank. I was covered head to toe in gasoline but luckily was able to shower off in the RV relatively quickly. I hope someone saw it happen because it would have been quite the sight to see. Any idea how or why this would happen?

Some (possibly) relevant background information: I drive a 2008 32-foot Winnebago Access. I was traveling through a lot of elevation in Wyoming. I accidentally filled up with 85 octane at my previous stop (it wasn’t until I was filling up that I realized that 85 octane is labeled “regular unleaded” in Wyoming). I filled up my tank multiple times afterwards and never had another issue. In the past, I occasionally had a “whoosh” of air release when I opened the gas cap but not recently.

I looked around the internet and couldn’t find much info. Could it be a bad gas cap? Could it be a problem in the pressure release system of my gas tank? Or was it just dumb luck and a one time occurrence?
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Old 07-26-2021, 10:24 AM   #2
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Check to make sure the vent hose out of the top of the tank has not fallen below the main fill hose.
The vent hose needs to be above the top of the fuel tank so fuel does not get in that hose.

On our new to us Workhorse, PO had had the fuel tank replaced. The installers didn’t properly strap the vent or fill hoses back up to the chassis correctly - made filling the tank impossible without filling slowly and at a cock-eyed position of the fuel handle.

A simple repair with a couple of ty-wraps.

But fuel being in that hose will prevent the tank from venting fuel pressure buildup that occurs in any fuel tank as the coach is driven. When the cap is removed, the pressure attempts escaping thru eithe the fill hose or the vent hose, and if there is liquid in either one of those hoses, you will get splashed.
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Old 07-27-2021, 10:45 PM   #3
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Your carbon canister has probably a mud dauber plugging up the the vent, or the vent solenoid is not working. You have obdII it should show up on a scan tool,may not turn the check engine light on.
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Old 08-05-2021, 09:14 AM   #4
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Quote:
Originally Posted by MrMark52 View Post
Check to make sure the vent hose out of the top of the tank has not fallen below the main fill hose.
The vent hose needs to be above the top of the fuel tank so fuel does not get in that hose.

On our new to us Workhorse, PO had had the fuel tank replaced. The installers didn’t properly strap the vent or fill hoses back up to the chassis correctly - made filling the tank impossible without filling slowly and at a cock-eyed position of the fuel handle.

A simple repair with a couple of ty-wraps.

But fuel being in that hose will prevent the tank from venting fuel pressure buildup that occurs in any fuel tank as the coach is driven. When the cap is removed, the pressure attempts escaping thru eithe the fill hose or the vent hose, and if there is liquid in either one of those hoses, you will get splashed.
This was the problem. A couple zip ties put the vent hose back in place. Thanks so much!!
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