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post #1 of (permalink) Old 12-27-2001, 11:36 AM Thread Starter
 
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Fuel Spewage on Headers

Here is a fun one - I smelled fuel when I stopped on the trail last summer. Checked it out and it was fuel spitting out onto the headers!! I stood back and let it cool down before investigating. Luckily I didn't burn her up right there.

It was coming from a hard green vent line by the drivers side firewall (good name) that goes back toward the fuel tank. I believe the line originally connected to the vacuum canister which was removed by the PO. I also noticed that the tank had pressure in it when I remove the cap, I think that is normal. I re-routed the line to dump on the ground for now. It is not dumping much, but it is a problem.

If I put another vacuum canister in, it will just fill up with fuel. I think by design there is a roll-over valve in the vent line and/or some kind of vapor vent that is supposed to vent vapor but not fuel.

It is a 1976 CJ7, 304, TH400, Q-trac.

Any ideas are appreciated.

1976 CJ7 304/TH400/QT/D30/AMC20
Front D44 in process.
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post #2 of (permalink) Old 12-27-2001, 12:22 PM
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Re: Fuel Spewage on Headers

I have a '79 CJ-5 and I have the same hard green line. Like yours, my vapor canistor is gone and the line was just capped off when i bought it. The lines on the fuel tank that whent to it were just plugged off with a short piece of fuel line. I have changed my fuel tank and plugged those lines right back like the other one. I took the green line off the Jeep. I have had no problems at all with fuel fumes or pressure in the tank and everything works fine. I suggest that you do the same and just plug it off at the tank and should be the end of your trouble.

'79 CJ-5
post #3 of (permalink) Old 12-27-2001, 12:26 PM
 
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Re: Fuel Spewage on Headers

When this started, what was the green hose connected to up front? Was the fuel coming from somewhere in the engine compartment or the tank itself? Is the carb vapor line also plugged up, usually with a stick or bolt? Is there still a fuel return line to the tank?
Having a little trouble picturing the situation. If the green tube, from the tank wasn't connected to anything up front, and plugged, then the fuel is coming from the tank. It should just be a vapor line, usually connected to the cannister. The tank end, of the greeen line, should just collect expansion vapors and send them to the canister.
There is a rollover check valve, i can't recall where and don't have a manual with me. As for the suction sound from the gas cap, some vehicles do and some don't, depending on how the cap and tank is designed. i don't recall either of my CJs making such a noise after being run for a while. Ask around though.
Let me know if i sound like i'm picturing this right. Any other details may help.

Scott...

My Rides
1979 CJ-7: 304, T-150, much is my rebuild
1985 CJ-7: 258, T-5, for Peru Excursion
1989 XJ: has seen every state except Hawaii

In search of lost paths and distant locations...
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post #4 of (permalink) Old 12-27-2001, 12:41 PM Thread Starter
 
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Re: Fuel Spewage on Headers

The green hose was disconnected when I bought the Jeep.
The fuel was coming from the green hose.
There is no carb vapor line. No fitting on the bowl for it either.
There is a return line that comes out of the fuel filter and it does run back to the tank.

I think you have the right picture - basically fuel coming out of a vapor line.


1976 CJ7 304/TH400/QT/D30/AMC20
Front D44, OBA in process.
JeepChicks: 1996 and 1997
JeepDude: coming in March, 2002
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post #5 of (permalink) Old 12-27-2001, 12:59 PM
 
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Re: Fuel Spewage on Headers

Now you just have to figure out why your tank is pushing fuel out that hose. The rollover valve i believe is near the tank, and may only work when rolled over, but i believe it should prevent any fluid in that line at all times. Write up a post asking about the rollover check valve in particular. Aside from that, too much pressure is building up in tank, when you take the gas cap off does it suck in or spray out. i'm guessing spray out, try smelling it, if so you might just need a new gas cap. Because i think it should be relieveing pressure. The other option is there is something wrong with the expansion tank inside the tank, but very unlikely.
The only trouble with the previously mentioned fix, is that gas does expand, and vapor has to go somewhere. You may never have a problem with the new setup but it would depend on how you ride, how long the jeep sits down, and temperatures near you.

S...

My Rides
1979 CJ-7: 304, T-150, much is my rebuild
1985 CJ-7: 258, T-5, for Peru Excursion
1989 XJ: has seen every state except Hawaii

In search of lost paths and distant locations...
MyRide is offline  
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