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01-01-2014, 09:55 AM
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CC Member
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Join Date: Nov 2004
Location: Cambridge, England,
n/a
Cobra Make, Engine: 289 leafspring, r/p
Posts: 518
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Not Ranked
Fuel vent pipe
Happy new year to all!
I'm installing my fuel tank. It's a stainless, going in a street 289 with the correct keyhole-shaped button Ceandess cap. The tank has a filler tube (central position), a fuel take-off at the base and the hole for the gauge sender unit. There is no vent pipe or similar to allow air in/out. The cap has a very small hole in the sealing plate that holds the rubber seal, which allows air to pass through. Is this enough, or do I need to drill and weld a tube for a vent pipe as well? What did originals have?
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01-01-2014, 12:22 PM
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CC Member
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Join Date: Jan 2001
Location: greensboro,
NC
Cobra Make, Engine: CSX 2401 street 289 Cobra and CSX 3288 Street "427" Cobra
Posts: 712
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Not Ranked
No vents in the original tanks. Jim
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01-01-2014, 01:24 PM
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CC Member
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Join Date: Nov 2004
Location: Cambridge, England,
n/a
Cobra Make, Engine: 289 leafspring, r/p
Posts: 518
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Not Ranked
Thanks Jim - very helpful.
Roger
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01-01-2014, 02:31 PM
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CC Member
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Join Date: Apr 2004
Posts: 1,029
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Not Ranked
Quote:
Originally Posted by Jim Maxwell
No vents in the original tanks. Jim
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Which can cause problems if the tiny amount of air the original cap passes goes down for any reason. Cars with really high fuel use per hour (think stroker engines, Webers, and high speed touring long distances......or open track play) can draw a partial vacuum on the tanks. If that happens fuel flow to the engine is hampered and the tank tries to collapse. Original terne plated steel tanks are made with leaded crimped seams and leaded over "tinner's rivets". Drawing a vacuum on the tank makes the tank flex more than normal and make the leaded seals break sooner than later.
I have heard car's tanks "sucking air" just after coming off track and shutting down. Next comes the sound of the tank walls popping back into position.
__________________
Dan Case
1964 Cobra owner since 1983, Cobra crazy since I saw my first one in the mid 1960s in Huntsville, AL.
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01-01-2014, 02:49 PM
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CC Member
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Join Date: Nov 2004
Location: Cambridge, England,
n/a
Cobra Make, Engine: 289 leafspring, r/p
Posts: 518
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Not Ranked
Might be worth just opening up the vent hole in the cap a little?
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01-02-2014, 11:09 PM
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CC Member
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Join Date: Sep 2009
Location: Camarillo,
CA
Cobra Make, Engine: SPF #2608, Roush 427SR T-W
Posts: 911
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Not Ranked
Since you plan to consume fuel from your tank, you better have a way to allow air into your tank to keep the pressure on the tank neutral or you will have a problem. If you were actually able to suck all the gas out of a tank, the vacuum might collapse the tank. You will have to vent the tank somehow.
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01-03-2014, 08:37 AM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 18,997
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Not Ranked
Mine is through the cap itself..........
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01-03-2014, 09:04 AM
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CC Member
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Join Date: Dec 2003
Location: Gurnee,
IL
Cobra Make, Engine: Kirkham #259
Posts: 1,396
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Not Ranked
Rsk289
Go to
KMP 259 Phase 2
The fuel cell on post 323 discusses the various needs and shows how we built the fuel cell.
The cap as well as the grounds, vents, and return lines to the cell......
__________________
Morris
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01-03-2014, 05:09 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
I'm retro fitting one of our keyhole button caps to an Aurora right now. It has a small 1/8" breather tube in the side of the neck.
Don't our caps vent through the screw hole in the middle?
On the new Shelbys they have a horseshoe shaped tube in the fill neck that draws a vacuum off the tank vent (outside of the tube) by a venturi effect (inside of the tube) from filling it. Of course my detailed explanation doesn't address your cap venting question it pertains to filling.
Last edited by mickmate; 01-03-2014 at 05:12 PM..
Reason: I'm rambling off topic
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