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1964 Chevrolet Chevelle Malibu 4 door
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Discussion Starter · #1 ·
I have NO experience with boats, but ran across this air fuel separator that I'd like to try on my car, do you think it will work?


I'm running a Tanks Inc extra capacity fuel tank, I have fuel coming out of my stock vent line and pressure build up in my tank due to vent restriction when fuel is in the vents.

The tank has 2 vents that Tanks Inc tells you to T at the tank and run 1 vent, I want to run the lines to a dual feed "burp" tank to help remove fuel from the vent line before it exhausts to the atmosphere. I was looking for something with a bigger "reservoir" to 100% keep fuel from venting out. I could mount this on the fenderwell in the trunk, run both vents to the bottom of it and attach the top to the factory vent line?

If you have a better solution, please share!
 

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Sounds like you just need a bigger vent hose to me.

But yes I think that would work fine for the setup.
I wouldn't vent it in the trunk. I'd see if you find space at the top of the frame by the cross member, but I doubt you would find room for that tank up there.
 

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Yes I鈥檓 running something like that. No more fuel vapor smell. $20 dollars
Font Auto part Tool Engineering Rectangle

Reread lol
Guess I may need something like you listed if I fill my tank to the filler base I do get fuel dripping also.
 

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Ryan
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I have the same tank. I used the stock 5/16 fuel line to a charcoal canister from a Harley Sportster. Got it off eBay for like 20 bucks. Works really well.

Just make sure there鈥檚 no dips in the rubber line to the hardline. I have it zip tied to the rear shock mount brace that goes the two spring perches together.

 

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Are the two vent outlets on the tank near one another or on opposite sides of the tank? I would think raising the point where you tee them together would solve your issue. Teeing them together at tank level defeats the purpose of having two vents.
 

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1964 Chevrolet Chevelle Malibu 4 door
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Discussion Starter · #6 ·
Thank you guys for the replies, greatly appreciate the amount of collaborative knowledge on this site!!

My plan is to run the 2 vent lines to this separator, then run the output of it to the stock vent line (hard line looped in trunk) to continue out to the pass wheel well.

I did hook the vents up as Tanks Inc instructions said. 5/16" from vent to tee, 3/8" from tee to factory vent. After this iteration I went back and changed the lines to 3/8" and ran nicop from the tee to the factory vent line. Didn't help, you can see the first setup below:


I honestly don't know how the vent line in the tank is terminated, but I know the vent on top of the fuel pump mount is just a hole in the lid w/ a barb fitting. Far as I know the tank is sealed well, followed directions, used Indian Head gasket shellac, and torqued the bolts evenly. I had a sealed cap and would get tremendous amounts of fuel coming out of the vent due to pressure building up, remove the cap and it was like popping the cork on an shaken up soda bottle. Switched to a vented cap and am getting a 1/3 of the fuel out the vent as I was before, but am still getting fuel. I thought about just getting a cheap air/oil separator off ebay, repurposing it as a burp tank for the vents, or find a small steel box I could put 2 ports in the bottom for the gas tank vents, then one out the side to continue to the factory vent?
 

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Ryan
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That tee is made of plastic. Is it possible that there is some obstruction from manufacturing inside? If you put the sealed cap on the tank, and blow a little bit of air through the vent line to pressurize the tank, you should then feel some air come back out at you as the pressure equalizes. Just a thought. I have zero pressure issues with the same exact tank and a non-vented cap
 

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I think the issue is you鈥檝e combined the two vents together to close to the tank. If any fuel gets sloshed into that tee, you鈥檝e lost both vents. Especially since they both come out so flatly. It鈥檚 also a little weird that Tanks Inc located them so close together in the first place.
I agree with teeing them together but I鈥檇 do it above the height of the fill neck so sloshed fuel in one tube won鈥檛 block the other. I鈥檇 also be tempted to replace the screw in vent fitting with a 45 degree fitting to get the hose going up right away and make sure the fixed vent coming out horizontal goes up asap. Any flat spots or dips are you enemy.
 

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Ryan
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Agreed about dips. I use the T but my line starts going vertical right away. I just climbed under to snap a picture.
Hood Sleeve Automotive tire Bag Bumper
 

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1964 Chevrolet Chevelle Malibu 4 door
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Discussion Starter · #10 ·
Thanks guys, I'll get under it and see what I have going on. Great points to review.
 
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