Fuel tank vent puking gas !! - Lateral-g Forums

DRJDVM's '69 · #1 04-27-2008, 03:02 PM

I recently installed a Rick stealth tank and am having issue with the vent tube puking fuel.

I have an older style where the vent hole is in the front near the sender. I got the valve Ricks supplies that drops in that hole (its like a tube with a ball valve in it) and have about a foot of hose coming off it. I looped it once and mounted the end about 4 inces above the top of the tank level. I then put a "K&N type" breather on the end to help with the fumes. I'm using the gas cap that came with the tank.

It still seems to puke gas out of the vent. I keep getting gas all over the tank and the rearend.

Obviously alot of guys on here run the Ricks tank, so what are you guys doing????

The only thing I can think of is running a hard line, looping it 3-4 times and trying to mount the top even higher. If anyone has pix of what they did, that would be great....

kennyd · #2 04-28-2008, 07:05 AM

i am having the same problem , i just have not had time to fix it yet .

Blown353 · #3 04-28-2008, 09:38 AM

Ned, I have the same issue with my Rock Valley tank, but only when it's over 3/4 full and it only slightly drips. What I did for now is to put a fairly sizeable fuel filter in the vent line, pointing upright and as high as possible under the car to collect most of the fuel "puked" out of the vent. I also bent some hardline and ran the vent all the way back to the bumper just by the license plate so when it does puke it does directly down to the ground.

The real solution that I'll fab up this winter will be to install another vent on the filler neck and run both vents to a small surge/overflow tank hidden up behind the bumper that is above the level of the fuel tank; it will catch and collect the fuel that comes out of the vent and allow it to drain back to the tank via one of the two vent lines. There will be a vent on the top of the surge tank obviously. A small surge tank, even 1/2 quart capacity should do the trick.

#4 04-28-2008, 01:27 PM

i have the same annoying problem with my ricks tank, and someone else i know with one as well

awr68 · #5 04-28-2008, 11:09 PM

So if you are using a factory vented cap can you just plug the vent at the tank so it's not an issue?

#6 04-28-2008, 11:57 PM

i found this on weldons site

10. Does my fuel tank need to be vented?
Yes, the fuel tank or cell requires venting to the outside of the vehicle. Do not use a vented gas cap in lieu of a true tank or cell vent

Musclerodz · #7 08-23-2011, 04:55 AM

the issue is too much pressure in the tank. constant return with corvette regulators does not help either, keeps the pressure in the tank up. we have the same issue here on rock valley tanks as well. I am hoping the vaporworx setup will solve some of the issue, but doubt it will solve puking when tanks are near full. charcoal or vapor cans is the only way to properly fix it.

**GregWeld** · #8 08-23-2011, 10:04 AM

The other issue is the vent line may be too small -- once some gas gets up inside the vent tube -- the pressure builds up behind it and pushes it out. A LARGER vent tube will allow the pressure to pass the fluid and not push it up and out. Think of a straw....

Hard line has a larger inside diameter... so hard line the same OD would be a better solution than rubber hose... BUT here's my other thought:

DO NOT loop it -- that effectively makes a "P" trap out of the vent line and any "fluid" would sit in the bottom of the "loop" and any pressure behind it would push that fluid up and out of the vent. The fluid in the loop would also block any incoming "make up" air.

ccracin · #9 08-23-2011, 11:16 AM

Quote:

Originally Posted by GregWeld

DO NOT loop it -- that effectively makes a "P" trap out of the vent line and any "fluid" would sit in the bottom of the "loop" and any pressure behind it would push that fluid up and out of the vent. The fluid in the loop would also block any incoming "make up" air.

BINGO, You are exactly correct. This will not be done on ours. I added a -6 vent fitting to our tank as well as the vented cap. Hopefully it is enough.

**GregWeld** · #10 08-23-2011, 12:01 PM

Quote:

Originally Posted by ccracin

BINGO, You are exactly correct. This will not be done on ours. I added a -6 vent fitting to our tank as well as the vented cap. Hopefully it is enough.

Of course I am!!

This ain't my first goat rodeo!