[mjk11]

I have a fuel tank on my 69 with a vented gas cap. When I fill the tank up, fuel pours out of the 2 vent holes on the top corner. Question I have is can I simply plug those 2 holes as I am using a vented cap? I have seen some say they use a 3/8' line attaching to a fuel filter and then run a 3/8" line up above the tank, I assume this is zip tied somewhere in the frame?

Any help would be much appreciated. Thanks.

Mike

 

[Dan Orgill]

Those vent holes are each meant to have rubber hose attached to them which points upward and is held to the body by a bracket. There is then a small filter ( with sponge inside ) that plugs into the two pieces of hose.

The vent holes are there which allows you to use a non-vented cap.

 

[mjk11]

Being that I have a vented cap, are both holes needed? I know about the filter (ground up has them). I am looking for a solution until I am able to get the piece as I am having the car tuned tomorrow. I have read that some of the members capped the small vent tube while running the hose off the larger tube up towards the body, inserting a small fuel filter on the end to keep anything from getting in and then running a small piece of 3/8 off the filter towards the pumpkin incase any fuel did manage to escape.

 

[Ark68SS]

It'll probably work OK, but if you want to do it right, look through this thread- http://www.chevelles.com/forums/showthread.php?t=358007
BillL

 

[NickeyChevelle]

This set from InLine Tube is hands down the best reproduction: correct sizes, correct clamps, and foam in the plastic vent. http://www.ebay.com/itm/69-70-71-Ch...ts=Model:Chevelle&hash=item2c6dc8b0d7&vxp=mtr

I do like the idea of a further vent tube to the rear of the car: slick idea.

 

[Bill Pritchard]

I've addressed this issue in the past in regards to my car (a 20,000 mile original unrestored when I bought it 11 yrs ago). My car never had the small foam-filled filter....it just had (and still has) the two hoses going up to the bracket on the frame or underbody. So, the hose ends are just open to the atmosphere. I have never had any problem with fuel spilling out of the hose ends.

 

[von]

FWIW I believe one of the vent tubes connects to a length of tubing in the tank to the rear of the tank (maybe opposite corner?). I assume so that one of the vent tube ends in the tank would be uncovered most of the time. When I had just a 5" length of hose on my vent tubes and no filter I usually had no problem, but when after filling up the tank sometimes a little gas would slosh out of the vent hoses and drip off the tank. I had a new '70 Nova with an unvented tank and vented cap. The filler neck was low, with cap behind the license plate. I remember getting told all the time that a lot of gas was coming out of my tank upon acceleration. There was a service bulletin in '70 with a replacement cap and I got the cap but still had the problem to a lesser degree. With a low filler neck/cap location to the rear of the tank it's almost unavoidable with a vented cap. The tank mounted vents were the best solution IMO but undoubtedly cost GM more money to produce.