Fuel Tank Cover

JGPierce · Post by **JGPierce** » Sat Jul 19, 2008 4:28 am

The gasket between my fuel tank cover and the fuel tank is cracked, migrating out from beneath the cover, and allowing fuel to spill out the top of the tank. Does anyone know of a replacement part number (NAPA)?

Also, I see that at some point the "fuel tank to air cleaner rear vent line" was cut beneath the tank and crimped off? The truck seems to drive fine, but then again the gasket is letting air (and water) in and out.

Thanks.

g741 · Post by **g741** » Sat Jul 19, 2008 5:17 am

I have these gaskets - I had them made of Buna impregnated cork which withstands the modern gasolines. This gasket is a bit of a trick to make since the holes are not equally spaced. This is to be sure that the cover and the internal filter or fuel pick up are properly oriented. My gaskets are correctly made and fit well. Contact at g741.ccwip.net. Sid

peter e mark · Post by **peter e mark** » Sun Jul 20, 2008 4:40 pm

Hello G741, aND please post another web address, Thank You, Peter Mark

Lifer · Post by **Lifer** » Sun Jul 20, 2008 6:48 pm

JG...

Regarding the vent line, its primary purpose is to allow air into the tank during fording operations when the vent in the cap is closed. As long as you're using a vented cap or have the vent open in the fording cap, it isn't needed and the truck should run just fine. If you ever find yourself in a position where it's necessary to cross a river, just be sure to use the bridge.

knattrass · Post by **knattrass** » Mon Jul 21, 2008 2:23 am

JG - Lifer's right, use the bridge or have a 5-ton with winch on the other side. We restored the vent on the tank by taking it out, apart, sandblast, paint, and then replaced the sender unit from MWM. We bought a sheet of gas compatible gasket from NAPA and cut our own. We had the tank itself RENU'd and then used gas compatible sealant with the gasket. Be sure to use thread sealant on the screws - both are odd ball sized available from ACE. We bought all new vent/fuel lines from MWM from the tank to the pump.

JGPierce · Post by **JGPierce** » Mon Jul 21, 2008 4:43 pm

Thanks Guys.

Peter: add a "@" after the g741 and Sid's email will then work.

I don't think I've got a vented cap. It looks stock so the venting is probably from the blown cork gasket.

Knattrass: Are the vent and fuel lines from John prebent? Mine look horrible with rust eating its way slowly through. That's probably what happened to the vent line at one time.

Lifer · Post by **Lifer** » Mon Jul 21, 2008 7:25 pm

JGPierce wrote:I don't think I've got a vented cap. It looks stock so the venting is probably from the blown cork gasket.

Look at the inside of your gas cap. If you have a fording cap, there will be a little lever inside which allows you to "open" or "close" the vent in the cap. If there's no lever inside the cap, it's a normal vented gas cap and air can enter the tank as gas is consumed.

It is possible, if your vented cap is plugged or your fording cap is closed, for your tank to build up a vacuum that's strong enough that the fuel pump won't be able to overcome it until you loosen the cap and allow air back into the tank. (I had that problem with my '79 Cadillac limo! Never heard of such a thing until it happened to me, but I learned quick.)

JGPierce · Post by **JGPierce** » Tue Jul 22, 2008 3:39 am

Thanks Lifer. There is no lever inside the gas cap so it should vent normally.

Fuel Tank Cover

Fuel Tank Cover

Fuel Tank Cover Gasket