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#1
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First Gen F-body Fuel Tank Vent
Hello all,
Initially I posted in the 67-69 Firebird section thinking my question was a bit more vechicle specific but I haven't had any responses yet. Apologies for the double postings. I have a 68 firebird. Purchased a Rick's tank for EFI and have installed a Sniper Xflow efi system. I was hoping that the vented gas cap would be sufficient to vent the tank but it's only a one-way vent as far as I can tell. I have an extra port on the top of the tank for a vent line. Everything I've read is that the vent line should be at least as high or higher than the fill port. I've read in some other forums where guys are running vents up high inside the trunk but I'm not convinced this is a good idea. I'm open to suggestions and if you're using a vent with a check ball or baffle of some kind I would really like to know what you're using. Thanks very much for taking the time to read through this.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear 1969 Firebird 350/TH350 Mostly stock 2.56:1 Rear |
#2
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The cap vents in but not out.I drilled a small hole in my cap I use when the car sits but if I drive with it fuel leaks out.Tom
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#3
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I use the vents on my Tanks Inc tank (1 on the tank, 1 on the pump hat) and tie into the factory vent that is indeed above the fill port. I have not had any issues with this setup.
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-Jason 1969 Pontiac Firebird |
The Following User Says Thank You to JLMounce For This Useful Post: | ||
#4
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You can run the vent line up above the rear end and coil the line a few times then point it back down. If the vent line is up the front of the tank the only time it "may" get fuel go into the line is when you're hard on the brakes
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#5
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Thanks Jason, if I'm not mistaken, the 69 has a vent tube built into the filler neck doesn't it? Is that where you're taking yours? If so, unfortunately, the 68 doesn't have this. I've heard of guys welding or brazing in an additional tube into the filler neck. I'm toying with that idea as well.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear 1969 Firebird 350/TH350 Mostly stock 2.56:1 Rear |
#6
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One thing I'm concerned about with the looping of line is if fuel does get up in there, wouldn't that create a vapor lock much like a p-trap in a sink drain and then defeat the vent? Maybe I'm not imagining what you're describing correctly.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear 1969 Firebird 350/TH350 Mostly stock 2.56:1 Rear |
#7
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Quote:
Other things I've seen people do is get a rollover vent and mount it near the top of the axle or mounted to the underside of the trunk pan. It just needs to be higher than the top of the tank. The rollover vents are a good safety device and aren't too expensive.
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-Jason 1969 Pontiac Firebird |
The Following User Says Thank You to JLMounce For This Useful Post: | ||
#8
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I thank you.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear 1969 Firebird 350/TH350 Mostly stock 2.56:1 Rear |
#9
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Not to dismiss, in a pinch this could work but...I would like to avoid wiping the bumper down after a field trip. I've got a pretty steep drive-way too.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear 1969 Firebird 350/TH350 Mostly stock 2.56:1 Rear |
#10
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I have 2 caps,keep the one with a hole in a zip lock bag.Tom
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The Following User Says Thank You to tom s For This Useful Post: | ||
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