V1 How does fuel tank vent?

[Oldchevyguy]

Hi there! Just wondering if I should save my charcoal vapor canister for the SS doner? Or do you use a vented cap? No mention in any of the videos. Please explain.

 

[DCMoney]

Don't need it.

Vent is on top of the tank, there's a tee that comes with the kit. Vents to atmosphere, have the hose going in front of the tank out of the ground.

 

[Oldchevyguy]

Don't need it.

Vent is on top of the tank, there's a tee that comes with the kit. Vents to atmosphere, have the hose going in front of the tank out of the ground.
View attachment 10305

Is there a rollover valve?

 

[DCMoney]

No.

 

[Ross]

I thought that hose was suppose to go up to the seat belt bar, then down to ground level. If the car is upside down, the gas won't drain out.

 

[DCMoney]

I thought that hose was suppose to go up to the seat belt bar, then down to ground level. If the car is upside down, the gas won't drain out.

Good call.

Nearly finished!

I haven't been active much in the forum but i have followed just about everyones build. Picked my frame up in August and have been hard at it ever since. I wana thank everyone for all the post that have been so much help. Big thanks to Adam and Lonny for anwsering every question i had no...

dfkitcar.com

 

[Oldchevyguy]

I thought that hose was suppose to go up to the seat belt bar, then down to ground level. If the car is upside down, the gas won't drain out.

That might work better than a rollover valve. I have factory 5 GTM with two corvette tanks vented with rollover valves. I park it in a hot trailer, and there is a strong smell of gas. Maybe this setup would keep that from happening?

 

[TheNuker]

I sealed my tank as I was running e85 on goblin 1

I did not want any water vapor getting in

 

[Oldchevyguy]

I sealed my tank as I was running e85 on goblin 1

I did not want any water vapor getting in

Please explain how you did this.

 

[TheNuker]

Please explain how you did this.

I clamped a hose from the metal hard line coming from the gas nozzle to the brass barb that you screw into the aluminum tank. I sealed that with a fuel safe sealer forgot the name. Kinda 2 fold I did not want any moisture in my E85 as that stuff sucks up water, and If I ever flipped I wanted no chance of that leaking out and turning me into a marshmallow over the fire

Nuker-

 

[Oldchevyguy]

Ok. How does air enter the tank as fuel is removed?

 

[TheNuker]

Ok. How does air enter the tank as fuel is removed?

It doesn't much I guess. When I popped the cap to fill up it always had a tiny vacuum.

Nuker-

 

[Oldchevyguy]

There has to have some way for air to replace fuel, or you will burn out your fuel pump. The stock CV k setup draws air threw the evap canister. I have heard of other people who did what you did having problems.

 

[Lonny]

E85 must be different than gas, when we built Adam's first car we installed a supercharger kit from ZZP. It had an unvented gas tank. It would swell the tank after a few minutes of driving and it seemed like it affected the fuel pressure.

The fuel pressure regulator is in the pump, so I guess if you have five pounds of pressure in the tank the fuel pressure will have to increase by five pounds to overcome the regulator.

We vent the tank in two places, we had to do this to help keep gas flowing into the tank smoothly during fill-ups. They tee into one tube that is ran across the tank to the middle of the car and then out slightly past the bottom of the car. In the case of a roll over this places the only tank vent above the tank.

 

[Briann1177]

The vapor pressure for E85 is quite a bit less than pure gasoline which explains why your tank swelled with regular gas.

 

[Rabid Sloth Racing]

With the vent tube exiting below the middle of the tank, wouldn't it still be a leak risk if the car rolled onto the passenger side? Shouldn't it come out of the top of the tank, go slightly to the passenger side and behind the tank, then slightly past the drivers side before exiting infront of and below the tank to create gravity traps in any position the car could end up in?

 

[Oldchevyguy]

Everything I read says to time it to #4 TDC compression, not #1. The proof with be in the pudding.

 

[G Atsma]

Everything I read says to time it to #4 TDC compression, not #1. The proof with be in the pudding.

What does this have to do with venting a tank?

 

[Oldchevyguy]

Oops! Wrong thread!

 

[Ark :D]

I presume the hoses used for the venting do not need to be fuel-rated?.... considering if they actually have fuel in them, I'm probably a corpse? lol