Fuel tank vent
 

After replacing by stock mech fuel pump with a $65.00 Holley mech my problem still exist. Truck idles fine when accelerating it wants to bog down, like it is running out of gas. I noticed that my fuel filter is not full like it used to be. Being that the fuel pump is good and I don't think it is a vapor lock issue, I then turned my attention to the tanl. If I leave my gas cap open I think it runs fine, but when I lock it closed it wants to die after a few minutes. Pop the cap and is fine. So, I think my tank is not venting. My truck has never had a return line since I had it, no carbon canister. Where is the tank vent? Any suggestions on how to fix this problem? The cap has been on this truck for 20 yrs it is off a Dodge Charger (if I rememer right).


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Re: Fuel tank vent
 

hello,,the vent on my 76 stepside is right in top of the sending unit,it has 3 lines in it,delivery,return (if you need it) and vent..the vent is just a little short hose with one of those plastic breather caps on it that "could" be stuck closed..:)

Re: Fuel tank vent
 

When I removed my charcoal canister and changed the fuel pump, I made a vent on my tank. I just used a short piece of hose with a small filter on the charcoal canister vent line at the tank switching valve. Works like a charm. Of course I redone all the fuel lines going to the tank. I didn't want the hard lines left laying in the cradle below the radiator.

If you never had a charcoal canister stock, it would be vented just like us111 stated.

Re: Fuel tank vent
 

After looking at mine, I only have two lines on the sending unit. Feed and return. The return is capped off next to the radiator. On the tanl itself next to the filler hose there is another line that goes to the top of the filler close to the cap on the inside of the fender. Is that the vent? I though that was a line to keep you from over filling it. Can I just "T" into that and make a vent?

Re: Fuel tank vent
 

Yes you should be able to do that.

Re: Fuel tank vent
 

Sounds like a venting problem but I had a similar problem with a 77 in high school . Mine turned out to be dry rotted fuel lines from the tank to the hard lines . It was also hard to start after sitting for a few days . Just a thought . Frank