What do you guys use for fuel tank venting? This isn't a fuel cell application, stock tank supporting EFI, I used to just have the factory deal, but discovered that the tiny hole in the factory fitting on top of the tank could cause a vacuum situation at low fuel levels and high consumption/ low return rate situations, meaning WOT. I rigged up a larger line on the '71 convertible a couple years ago but I occasionally smell gas. It vents under the car above the rear end housing. I saw the II Much Fabrication deal in Violent Valiant build here on Bang Shift and I think it looks promising. What works for you guys?
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Bill, I ran into that. I just took a drill bit and drilled a couple of holes in the inside of the gas cap to make it vented. Never had the problem again.Life is short. Be a do'er and not a shoulda done'er.
1969 Galaxie 500 https://bangshift.com/forum/forum/ba...ild-it-s-alive
1998 Mustang GT https://bangshift.com/forum/forum/ba...60-and-a-turbo
1983 Mustang GT 545/552/302/Turbo302/552 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail
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I remember a rule about vented gas caps. As in, NHRA doesn't allow them.My fabulous web page
"If it don't go, chrome it!" --Stroker McGurk
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I have a stock tank with a sump welded in the bottom, Draw is from the sump of course, return is threw the stock draw enlarged to 1/2", vent is the stock return. I ran a line up to a rollover check valve through the floor of the trunk and ran a hose back down from the check valve through the trunk back down above the axle as to keep the vent outside the trunk.First place SSBBNA 2014 and 2015
Second place SSBBNA 2016
Third place SSBBNA 2017
Quickest ET in DD and Quickest Pontiac 2008, 2016 and 2017
All 13 years of Drag Week in a Black 1969 Pontiac with Pontiac Power
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Life is short. Be a do'er and not a shoulda done'er.
1969 Galaxie 500 https://bangshift.com/forum/forum/ba...ild-it-s-alive
1998 Mustang GT https://bangshift.com/forum/forum/ba...60-and-a-turbo
1983 Mustang GT 545/552/302/Turbo302/552 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail
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Originally posted by CDMBill View PostWhat do you guys use for fuel tank venting? This isn't a fuel cell application, stock tank supporting EFI, I used to just have the factory deal, but discovered that the tiny hole in the factory fitting on top of the tank could cause a vacuum situation at low fuel levels and high consumption/ low return rate situations, meaning WOT. I rigged up a larger line on the '71 convertible a couple years ago but I occasionally smell gas. It vents under the car above the rear end housing. I saw the II Much Fabrication deal in Violent Valiant build here on Bang Shift and I think it looks promising. What works for you guys?
cap and a small amount of vac or pressure in the tank is common... if you dont like the smell issue
that can be corrected with a charcoal canister attached to the vent line... if you believe that you
are getting too much vac at WOT then yes you need a larger vent line .. either another line or a
completely new line(larger)
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I did the larger -8 line on the 71 and created the fumes issue. I have gone ahead and ordered the II Much Fabrication unit in a side mount configuration. I'll add pictures when it arrives. Or check out their link on the BS Sponsors page. I like to support the companies that support us whenever possible. Spend some time on their site and check out the tech blogs and stories. I learned a ton.Drag Week 2006 & 2012 - Winner Street Race Big Block Naturally Aspirated - R/U 2007 Broke DW '05 and Drag Weekend '15 Coincidence?
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I made my own charcoal canister out of a Summit take apart
fuel filter... the one with just the screen in it... its large enough
that I poured the charcoal from a junkyard canister into the filter
but I added another screen so the charcoal stays in it... I have
to take it off once in a while to purge the vapors(just hook up a
air hose to the end with low flow for overnight).. that takes care
of the fumes
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Clever approach. This is the II Much Fabrication unit. It is not a Charcoal absorption unit, it is a vapor/liquid separator so it requires no maintenance. They have been tested by Aeromotive up to 1400 HP and are recomended by Aeromotive among other fuel system and tank makers. In my case it will mount to the trunk lid hinge spring bracket up and out of the way so the trunk can be packed for Drag Week etc. The pictures are all theirs as you can tell; I'll post mine when I have the unit set up. It will be venting an Aeromotive stock style tank with the Eliminator in tank pump. I'll be adding a roll over check valve in the tank to vent unit line to meet NHRA requirements. The cap will remain non-vented as factory.
The install pictures are on a '69 Camaro which is way more sano than my shabby heap. Lines and fittings are up to the car builders preference.
The bracket shown here is owner fabbed, i will bolt mine directly to the trunk hinge bracket and save the weight.
Drag Week 2006 & 2012 - Winner Street Race Big Block Naturally Aspirated - R/U 2007 Broke DW '05 and Drag Weekend '15 Coincidence?
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Looks Heavy,,,,,,,, Just Sayin2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
First to run in the .90s .80s and .70's in SBN/A
2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!
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