'88 E350 Fuel Tank Vent...
 

Hello ALL! I tried to post this question before. I'm a MOPAR Old Man but I got a FORD now! My van is a 351 "W" MPI with a C6 automatic. It seems there is a secondary vent line to the tank. i repaire the vacuum line to the charcoal canister... it was completely closed. I get a wif of fuel when I walk past the rear. I did find a 5/16 line open, going nowhere; I'm assumeing to secondary vent? Does anyone have a clue to help me here?
Thank You All and Hello!! (Tucson, AZ)

Hi Bill, welcome to the Ford family !

If there is no diagram under the hood , or it is impossible to read maybe we can help.
There should be a line from the fuel tank(s) that goes to the charcoal canister. Another line should come from the canister and go to a CPRV ,canister purge regulator valve, and the other side of the valve has a line to the throttle body.
If you require additional info , will be happy to help. I would send a copy of the vacuum diagram, but it is of such poor quality you would never be able to read it.
If I remember correctly the location of the canister was such that it collected all kinds of road dirt and needed to be cleaned once in a while. I believe it was in the R/F wheel housing or right behind it.

Well, my Charcoal Canister is mid way between the wheels on R/Central frame rail. I still that ther is a secondary connection, part of it might be missing. I think I might tie this loose lin (0.3125) with a "Tee" fitting to the vacuum line from the top of the tank ... back to the charcoal canister, at the least no gas fumes. Thoughts?
Thanks!

Do you know if this vehicle might have had two fuel tanks at one time?

I don't think so... no second outside door. This van was a local school district work vehicle, local area only. Well maintained!

My '88 E-250 had a tee at the rear tank with one side of the tee had a hose that just ended with like a little check valve or such on the end. I think the other ran along the frame rail to the canister.

I theorized that the hose should end with a check valve. I have obtained one however, the directions states mount S/B high as possible and equal to the gas cap height. That is a bit difficult. I'm working on placement. Thanks so very much for you input!
Regards, BilldarrAZ - Tucson.

Mine just sat at the top of the fuel tank right at the rear bumper.