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Unread 01-02-2010, 07:54 AM   #1
MontiyCJ7
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Back Splash out the vent hose

I'd like to ask the master minds of this forum for some ideas of how to stop gas from rocketing out of the filler vent hose on my 1980 CJ7. I 've searched the threads and found nothing that would help me. Problem: when filling up and near "top off" gas willl shoot up through the vent hose (not the main filler hose) and shoot out all over. I have the vent hose out and thought of putting some kind of check valve (that i can't find) or something else to stop or slow down this gas problem. I know I can put my ear to the tank on fill ups and listen but, since I have the hose out I thought I could do something about this. I need some help please. Thanks for your time!

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Unread 01-02-2010, 08:21 AM   #2
halpeters
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It is a rubber hose that runs from the tank to the filler neck.

Some ideas...

Try putting a hose clamp about half way down the rubber hose to choke off part of the flow.

Make sure the hose isn't being pinched at the bend next to the filler...

Hal
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Unread 01-02-2010, 05:29 PM   #3
MontiyCJ7
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Thanks Hal. I thought of putting something inside the hose to help stop the sudden burst of gas coming up through the vent hose. Any ideas that would be gas resistant? I don't understand why the vent hose has such a large diameter. Still looking for more other ideas.
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Unread 01-02-2010, 07:01 PM   #4
oofrog
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i had an issue when it was full, and i was on a fairly extreme angle, that gas was pouring out of it, lost about 1/4 of a tank as we towed me out???

is there anything that can be done to stop this?
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Unread 01-02-2010, 07:36 PM   #5
keith460
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Quote:
Originally Posted by MontiyCJ7 View Post
I'd like to ask the master minds of this forum for some ideas of how to stop gas from rocketing out of the filler vent hose on my 1980 CJ7. I 've searched the threads and found nothing that would help me. Problem: when filling up and near "top off" gas willl shoot up through the vent hose (not the main filler hose) and shoot out all over. I have the vent hose out and thought of putting some kind of check valve (that i can't find) or something else to stop or slow down this gas problem. I know I can put my ear to the tank on fill ups and listen but, since I have the hose out I thought I could do something about this. I need some help please. Thanks for your time!
Are you sure you have the correct filler and vent hoses connected correctly? The vent hose should be off the top of the tank and has a formed bend or hump molded in place to prevent gas from shooting out. Plus, the metal filler neck has two vent exit ports built into it that splits the air escaping from the tank. If you are over filling the gas tank, fuel would exit from the fill tube instead first because it is mounted lower on the tank than the vent tube.

Quote:
i had an issue when it was full, and i was on a fairly extreme angle, that gas was pouring out of it, lost about 1/4 of a tank as we towed me out???

is there anything that can be done to stop this?
Replace your gas cap gasket or just buy a new gas cap. Fuel should not spill out as the cap prevents this and keeps fuel confined to the filler neck area and the fuel will drain back into the tank. No automobile designed is allowed to have fuel leak from the cap as per Safety and EPA regulations.
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Unread 01-02-2010, 10:54 PM   #6
PERK
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is your tank vented to the charcoal cannister?
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Unread 01-03-2010, 10:05 AM   #7
Mike Romain
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Originally Posted by MontiyCJ7 View Post
Problem: when filling up and near "top off" gas willl shoot up through the vent hose (not the main filler hose) and shoot out all over.
Well, gas is supposed to come out this 'vent' hose when the tank is full to shut off the automatic gas filler nozzles. I believe that is the main purpose for this line.

That is actually one of the 'fixes' to turn some YJ 15 gallon gas tanks into a 20 gallon gas tanks. They have the hose set deep enough that gas pours out the vent tube at the 15 gallon mark, folks move it up and can put in 20 gallons.

That said, maybe you just need to slow down the rate of fill when it gets near full or find a gas station that has those splash guards (made just for this problem) on their pump nozzles. Gas blows back out of most gas tank fillers if you don't slow the pump down near the end. My CJ's sure will...
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Unread 01-03-2010, 09:05 PM   #8
MontiyCJ7
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Thanks guys for all the great comments. I thought that there would be a quick fix but, I guess I'll look for a gas station with that splash guard on the pump handle. If I have a charcoal cannister could I use the idea and reduce the diameter of the vent hose?
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Unread 01-04-2010, 06:49 AM   #9
Mike Romain
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Quote:
Originally Posted by MontiyCJ7 View Post
Thanks guys for all the great comments. I thought that there would be a quick fix but, I guess I'll look for a gas station with that splash guard on the pump handle. If I have a charcoal cannister could I use the idea and reduce the diameter of the vent hose?
The hose in question is not a 'vent' hose. It is a shut off hose for an automatic gas filler nozzle. When you close the gas cap, this line is as closed as the fill line.

The gas tank still needs a vent hose or it can get a vacuum on it causing the engine to run out of gas if sealed and if left open bad raw gas fumes escape.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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