BUILD THREAD “The Juggernaut”

[Tony1968]

Also I have run into the vaccum issue with a fuel cell in my first chevelle. Long story short, I was having a problem with car stumbling and eventually dying out. After troubleshooting, I figured it out when I opening the fill on tank and plastic top of tank popped up. It was in a vaccum. This was pre internet and not much of any info available.

 

[Rktpwrd]

Since your vent is going back into the tank, does this make it a sealed system? In other words the vent isn't really venting

I kinda figured I’d get called out on this. But to the best of my knowledge (I’m like 85% sure), the gas caps on our cars are vented. If I’m wrong, somebody please correct me. But if I’m correct, venting the tank to the filler neck should be sufficient because it will vent the tank through the cap. I can’t see how even the factory system would work if the cap wasn’t vented, it would result in a vacuum situation as you described.

Again, if I’m wrong here though, somebody please correct me.

Worst case scenario, if it does indeed create a vacuum situation, I’ll just pull the filler neck fitting and hose, plug the hole, and run the vent port to a rollover valve. The Aeromotive system did not come with a rollover valve, so if yours came with one I would just use it.

 

[melloelky]

looks good as usual.i did something similar years ago(abet not as nice)because there was some kind of venting problem happening when refilling w/the aftermarket tanks.it would behave like it was full when it wasn't.i also ran into a similar set up on late 80's f series dump trucks,choose a vented cap when the time comes,it's cheap enough insurance.

 

[Tony1968]

I kinda figured I’d get called out on this. But to the best of my knowledge (I’m like 85% sure), the gas caps on our cars are vented. If I’m wrong, somebody please correct me. But if I’m correct, venting the tank to the filler neck should be sufficient because it will vent the tank through the cap. I can’t see how even the factory system would work if the cap wasn’t vented, it would result in a vacuum situation as you described.

Again, if I’m wrong here though, somebody please correct me.

Worst case scenario, if it does indeed create a vacuum situation, I’ll just pull the filler neck fitting and hose, plug the hole, and run the vent port to a rollover valve. The Aeromotive system did not come with a rollover valve, so if yours came with one I would just use it.

Not really calling you out. And I honestly have no idea about the cap. Is there a way to know if it's vented? With all emission requirements even back then i would guess no but I just don't know. Now I have to go take a look at my gas cap. Lol

 

[Rktpwrd]

I think Chris is right, I believe there are vented and non vented caps. It could/should be just as easy as making sure the right one is used.

 

[Supercharged111]

My car had a tank with 3 lines at the sender and I replaced with a 2 line sender. The 2 line sender was marked for something like a 1980 Buick Century only, so I got the impression the overwhelming majority of these cars had charcoal canisters?

 

[Built6spdMCSS]

2 line sender is Carb, 3/8" and 1/4"

3 line sender is EFI, 3/8", 5/16", 1/4".

 

[Supercharged111]

2 line sender is Carb, 3/8" and 1/4"

3 line sender is EFI, 3/8", 5/16", 1/4".

What's that 1/4" nip go to?

 

[Rktpwrd]

My car had a tank with 3 lines at the sender and I replaced with a 2 line sender. The 2 line sender was marked for something like a 1980 Buick Century only, so I got the impression the overwhelming majority of these cars had charcoal canisters?

Correct, but this no longer emissions equipped. So no provision to reconnect it to the charcoal canister. Now an apples to oranges comparison.

What's that 1/4" nip go to?

The charcoal canister in stock configurations.

 

[Supercharged111]

Correct, but this no longer emissions equipped. So no provision to reconnect it to the charcoal canister. Now an apples to oranges comparison.



The charcoal canister in stock configurations.

So, if a charcoal canister is present, wouldn't that mean the cap is not vented?