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Old 02-18-2017, 05:45 PM
randy randy is offline
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Default fuel tank vent Leaking / misting

Is it normal for some fuel to mist out of a fuel vent? Im running the Finch performance dual vent system that is mounted in my trunk and after going on for some spirited driving and parking the car you can hear and see fuel mist coming out of the vent. Any idea what it could be? 67 camaro ls3, Ricks notched corner tank with new camaro fuel pump.

FYI we have this system on 2 other cars and experiencing the same thing.
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Old 02-18-2017, 10:01 PM
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Vegas69 Vegas69 is offline
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Not ideal, but it's tough to vent these tanks. Where did you install the vent?
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Old 02-18-2017, 10:03 PM
randy randy is offline
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Quote:
Originally Posted by Vegas69 View Post
Not ideal, but it's tough to vent these tanks. Where did you install the vent?
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Old 02-18-2017, 10:05 PM
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Perfect place... It's been a while, but I'm pretty sure I gave up on Rick's vent and had my own bigger bung welded close to the top of the tank. I then ran it to a radiator type overflow at the bottom bung and vented it to a K&N filter through the top bung. Then out of the trunk and never had a problem after. The diameter of your vent could be your problem.
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Last edited by Vegas69; 02-18-2017 at 10:09 PM.
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Old 02-19-2017, 08:59 AM
dhutton dhutton is online now
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What is the fuel level in the tank? Is the tank hot?

Doesn't this imply that something is heating the fuel? Exhaust and/or fuel pump?

Fuel mist spraying out near the exhaust would worry me.

Don

Last edited by dhutton; 02-19-2017 at 10:06 AM.
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Old 02-19-2017, 11:22 AM
randy randy is offline
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Tank isnt hot. I could put my ear against the tank right after driving it. You can hear the fuel gurgling which is most likely the air coming out of my fuel vent hurling the gas as the gas comes back down. Overall I think it's the location of the return bung line bung / vent bung.

I have a vent port on my ridetech gas cap filler tube. Maybe I'll run an additional line to it and filter?

Maybe the volume of the dual vent system holder isn't enough and I could run a T out of the gas tank and then run two lines to the fuel tank? Double the fuel capacity of the overflow but does this fix it or prolong it?
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Old 02-19-2017, 03:15 PM
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You can test the volume of your vent by loosening the gas cap. If that stops the problem, then you likely need more vent. You could rig up the 2nd vent from the ride tech port and see if it fixes it.
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Old 02-19-2017, 08:18 PM
rocketrod rocketrod is offline
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I have the same fuel tank on mine with nothing but a vented gas cap and have not had any issues driving it over 15,000 miles with a 445rwhp ls2.

Do you have good fuel pressure at the fuel rail? Any other symptoms
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Old 02-20-2017, 12:12 AM
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Quote:
Originally Posted by rocketrod View Post
I have the same fuel tank on mine with nothing but a vented gas cap and have not had any issues driving it over 15,000 miles with a 445rwhp ls2.

Do you have good fuel pressure at the fuel rail? Any other symptoms
Zero other issues. Vented gas cap is at the highest point and your return is a long filler neck. The return in this tank is on the upper end of the tank but not the highest point. I'll see what happens with less gas in the tank
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Old 02-20-2017, 04:41 PM
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Did you over fill your tank? I ran into the same problem yesterday after I filled the car with gas. I thought I cut fuel before hand, but managed to over fill the tank. When I turned the car off I had fuel coming out of the vent.

Went for a spirited drive until I saw the fuel gauge drop a bit. Got home no more leaks.
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