Fuel Tank Vent

[sayers]

It sounds like your truck had a vapor recovery system (charcoal filter) at one time, and someone has removed it. Usually, these system operate using a non-vented gas cap. pressure is equalized via the system. Now, your truck is venting via the tube with nothing connected to it, and thats dangerous. You're about to start a big fire.

Two options:

1. Go to Napa/Auto Zone/Oriellys/allthesameanyway and buy a charcoal filter for a vapor recovery system, and some tubing and then rig the thing up. This won't be so easy, because they'll want to know what make and model so their super computer can id the part for them. I miss the days of the auto parts store employing people who actually knew how to work on a car.

2. Call our hosts and ask them for a vented gas cap for your truck, and cap off/get rid of that open line.

Hope this helps.

I have an all orginal 88, it has the charcoal canister and all piping or tubes, it also has the orgin. cap, I was thinking just not fill or try to fill it up all the way when the pump kicks off the first time. I am thinking that the tube may be off or cracked, maybe need a new hose to the expansion tank, I'll have to investigate further. thanks

[thixon]

I have an all orginal 88, it has the charcoal canister and all piping or tubes, it also has the orgin. cap, I was thinking just not fill or try to fill it up all the way when the pump kicks off the first time. I am thinking that the tube may be off or cracked, maybe need a new hose to the expansion tank, I'll have to investigate further. thanks

Sayers,

If it were me, I'd do exactly what you mention and look for leaks. You can just stop filling the tank full to stop the leaking, but if you rolled while wheeling you could start a fire. Thats always a possibility anyway, but why add another variable to the equation?

Remember, there's no reason you have to run with all that installed. You could just rip it out, get a vented cap, and cap off the elbow in the top of the tank that ran to the venting system.

[sayers]

Sayers,

If it were me, I'd do exactly what you mention and look for leaks. You can just stop filling the tank full to stop the leaking, but if you rolled while wheeling you could start a fire. Thats always a possibility anyway, but why add another variable to the equation?

Remember, there's no reason you have to run with all that installed. You could just rip it out, get a vented cap, and cap off the elbow in the top of the tank that ran to the venting system.

travis, that a good idea, I will let you know what happens, I am just trying to keep the rover as orgin. as possible. thanks again.

[sayers]

Sven, I took the rear access panel off from under the rear left wheel well, this gives you access to the expansion tank, I had a loose hose, you might check this out. good luck.

[Jeff Aronson]

There are caps that are vented and unvented. Series II-A's have the overflow and need the vented cap. It makes sense that the Series III would be a non-vented cap; the whole idea was to trap the vapor in the system, and thus the charcol canister.

I fill the tank slowly and pay attention to it's likely amount needed to fill. I haven't had an overflow since then. I wonder if the military dual tanks create different dynamics.

Jeff

[94rangie]

..in the center of the lug side of the cap. Only drill through one layer of metal. You now have a vented cap. I did this in '91 and it has worked great.

Is the lug side from the outside or the inside?

[Jim-ME]

It's the inside. I had to make my unvented cap vented by drilling a 1/32 hole in the center of the cap thru the first layer of metal. You don't want to drill thru both layers because rain, snow melt and crap can get in.
Jim

[94rangie]

Thanks. I took a closer look at it today and it all makes sense. I'll drill it out tomorrow.

Larry