Fuel cell vent - vapor build up in garage

[MikeR]

Hi all you current fuel cell users, I have a fuel cell with a vent line, the problem is fuel vapors build up in my garage - something I'd like to eliminate.  Do I need the vent?  is there a certain way to run it so vapors don't escape so readily?  I have a simple fuel line hose running up out of the Fuel cell up about 4" then out the floor of the trunk.  The fuel cell is submerged into the floor about half way.

Maybe there's a valve that only opens when it reaches a certain pressure?

[flyboy01]

Try running the vent up to the top of the trunk, then back down to the floor. I may be wrong, but I think that fuel vapor sinks, so the bend up, then back down should work, this is a similar setup to the 68 darts.

[jet-taz]

i going to use a old style gm vapor canister and hook the vent line to it and back to the carb.

[NYrr496]

Don't you put a loop in the vent line to prevent that?? Not sure... Never used a cell.

[west]

here is my set up,no stinkies.

[bOb shingler]

have you thought about plugging it when not in use?

[MikeR]

Do I really need a vent if it never gets above 80 degrees here?  I'm assuming I do... A Charcoal canister seems like a good solution, or maybe I'll try a fuel line looped like the Purple duster on the features page.  I drive it fairly frequently so plugging and unplugging would be a bummer.

[NYrr496]

Don't plug it.

[farmington]

Beautiful car, Mike.  Paint looks fantastic.  but is it screaming out for a white bumble stripe?

[MikeR]

Well my goal from the beginning was to build a car that could blend in with traffic, the tires defeat that more than I thought they would but I definitely like the idea of not having stripes, wings, or any of that sort of "Attention Grabbers".  Sort of like making it almost plain until someone really looks at it.

Thanks!  The paint has a couple of real nice scratches in it, so a street car it truly is

[NYrr496]

Mike, that's how I build all my stuff after having a bright yellow 69 Charger with a black bumblebee stripe. That thing was a cop magnet second only to a Superbird. My buddy Bruce drives a 91 Camaro with no hoodscoop, stripes, custom wheels or anything. The ONLY giveaway is the 2 1/2" duals and the exhaust note. My roadrunner is going to be a resto type color with billet Magnum 500's. To the casual observer, it'll be a resto. Same with my daily driver. Bone stock on the outside 98 Yukon. I drive everywhere 75 MPH. No one even looks at it.

[sunsetdart]

I have a coiled aluminum tube that goes from the cell to thru the floor. It works on a "P" trap theory. Fumes can't totally get out, but if you plug it, you will not get fuel to the carb, will create a vacuum.

[MikeR]

That's what I'll try sunset, thanks!

[75Dart440]

Also, if you plug the vent off, during seasonal temp changes, you will either force fuel into the carb due to expansion and swell the fuel cell, or the exact opposite, the cell will collapse in.

[Pro Street dart]

I was having the same problem.

Read somewhere that somebody put a PCV valve in the end of the vent line. Tried it and it works great!

No pressure build up problems all summer.

[MikeR]

The valve goes in the end on the cell or under the car?  Does it matter what direction the valve goes in?

[illfish]

The valve has to go with the large OD of the plunger towards the tank.  If it's backwards it won't operate and will continue to build pressure.

[Pro Street dart]

My vent hose hangs out back just below the bumper. You can't see it. It's in the end of the vent hose. I have the small end of the PVC valve in the hose. I have seen this on ther cars too.

[illfish]

It doesn't make sense.  The PVC is on the motor to pull the crankcase blowby out by Vacuum.  It's a one way valve and it sounds like you have it in backwards.  The gas tank is continually pressurizing by vapor bleed off.  Rick's hot rod shop told me to use a '02 gm carbon vapor can for the vent. 

[NYrr496]

I think I would just do a tube with a loop in it along with a rollover valve. Aeroquip makes them.

[Pro Street dart]

You are probably correct illfish,  but I have not experienced any type of pressure build-up in the cell. Just no more gas vapor from the vent line. Fuel cap is air tight.