[C2] I'm an idiot, vented gas cap not working
10-24-2016, 11:07 PM
#21
Team Owner
This was not my tank, it came out of my old boss's coupe about 4 years ago...yes it was running real bad on our way to a car show in the mountains, to "lake almanor", when we stopped to fuel up before we headed back after a car show...he said his fuel tank was gone...limped home and went out the next day to remove....he bought a correct vented cap...
10-25-2016, 12:35 AM
#22
Melting Slicks
God no!!!
This was not my tank, it came out of my old boss's coupe about 4 years ago...yes it was running real bad on our way to a car show in the mountains, to "lake almanor", when we stopped to fuel up before we headed back after a car show...he said his fuel tank was gone...limped home and went out the next day to remove....he bought a correct vented cap...
This was not my tank, it came out of my old boss's coupe about 4 years ago...yes it was running real bad on our way to a car show in the mountains, to "lake almanor", when we stopped to fuel up before we headed back after a car show...he said his fuel tank was gone...limped home and went out the next day to remove....he bought a correct vented cap...
. I was referring to the OP's original post AND to post #9 from DansYellow66, not yours. 
Gary
Last edited by Gary's '66; 10-25-2016 at 12:37 AM.
10-25-2016, 05:40 AM
#23
Team Owner
So conceivably it would take greater than 14.7 psi to blow the tank back out...
Buuuut its early and I'm only one cup of coffee into my morning...
Last edited by Frankie the Fink; 10-25-2016 at 05:43 AM.
10-25-2016, 09:15 AM
#24
Le Mans Master
See vent to left side
Jack
Last edited by Jackfit; 10-25-2016 at 09:24 AM.
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10-25-2016, 09:53 AM
#26
Melting Slicks
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Atmospheric sea level pressure is 14.7 psi on the tanks exterior, so as gas is gradually drawn from the tank and a vacuum is created, at some point, somethings gotta give...it just takes a while with the pissant fuel pump sucking away at low psi...
So conceivably it would take greater than 14.7 psi to blow the tank back out...
Buuuut its early and I'm only one cup of coffee into my morning...
So conceivably it would take greater than 14.7 psi to blow the tank back out...
Buuuut its early and I'm only one cup of coffee into my morning...
Gauge pressure is what your tire gauge, air compressor gauge, and most everything else you have reads.
10-25-2016, 10:07 AM
#27
Race Director
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14.7 psi gauge pressure won't hurt a thing. I've pressure tested radiators over 20 psi....and the rubber tires in my '15 Ford run 70psi...No problem whatsoever blowing the tank back into shape with a 100 psi shop line.
10-25-2016, 10:52 AM
#28
Le Mans Master
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Atmospheric sea level pressure is 14.7 psi on the tanks exterior, so as gas is gradually drawn from the tank and a vacuum is created, at some point, somethings gotta give...it just takes a while with the pissant fuel pump sucking away at low psi...
So conceivably it would take greater than 14.7 psi to blow the tank back out...
Buuuut its early and I'm only one cup of coffee into my morning...
So conceivably it would take greater than 14.7 psi to blow the tank back out...
Buuuut its early and I'm only one cup of coffee into my morning...
I just cannot resist.
Its the same concept as taking a plastic gas can and pouring gas out without cracking the vent. Then traveling up into the mountains.
You can rig up an air compressor to the gas tank. Make sure its sealed up well so the pressure does not bleed off. Then take a small amount of air at a time to blow it back into shape. Just start off with a little pressure until it pops.
So now, the order was:
suck, blow, pop. What a stress reliever
10-25-2016, 11:20 AM
#29
Team Owner
10-25-2016, 02:40 PM
#30
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Well look on the bright side.. it probably fits better now!
This happened to me IN AN AIRPLANE many years ago. My dad was a private pilot - we were in his Grumman Tiger.. Engine starts sputtering.. I look out my window, and the WING is puckered in!!!! Not good!
He switched over to the other tank and we landed ASAP... but wowza! That will get your heart going.
This happened to me IN AN AIRPLANE many years ago. My dad was a private pilot - we were in his Grumman Tiger.. Engine starts sputtering.. I look out my window, and the WING is puckered in!!!! Not good!
He switched over to the other tank and we landed ASAP... but wowza! That will get your heart going.
10-26-2016, 07:56 AM
#31
Melting Slicks
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Guess I was overly cautious about the bomb thing. Anyway, go slow when pressurizing.
09-02-2017, 02:57 PM
#33
1st Gear
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62 fuel smell
thanks for this forum and topic.
i also have a fuel smell typical of this vintage (mine a 62).
i pulled the inspection cover off by the tank and all connections looked good and dry. I did note that the hose from the fuel fill to the tank was not a very good fit (a bit loose) and the gas cap side clamp is a challenge to tighten.
i gave them a twist and also sourced a non venting cap as suggested. I will road test and report back.
road test completed- no gas smell!!
fixes applied: new stant non vented (and good fitting) gas cap
adjusted clamps
replaced access cover screws
currently at 2700 ft elevation, curvy mountain roads and 1/3 tank.
i also have a fuel smell typical of this vintage (mine a 62).
i pulled the inspection cover off by the tank and all connections looked good and dry. I did note that the hose from the fuel fill to the tank was not a very good fit (a bit loose) and the gas cap side clamp is a challenge to tighten.
i gave them a twist and also sourced a non venting cap as suggested. I will road test and report back.
road test completed- no gas smell!!
fixes applied: new stant non vented (and good fitting) gas cap
adjusted clamps
replaced access cover screws
currently at 2700 ft elevation, curvy mountain roads and 1/3 tank.
Last edited by Jdsafari; 09-02-2017 at 04:09 PM. Reason: Update
09-03-2017, 12:15 PM
#34
atmospheric pressure is 14.7 pounds per square inch and that is what pushed in the tank so you will need that plus more to push it back out
Last edited by PAmotorman; 09-03-2017 at 12:15 PM.
09-04-2017, 06:30 PM
#35
Burning Brakes
tanks
So last winter I had the gas tank replaced in my '64 because of excessive rust. Had the original to me "vented" gas cap put back on the tank. However, I did notice at times, when opening the gas cap it wasn't venting properly and I could hear a WOOSH sound when taking the cap off. Well apparently it wasn't venting enough that the fuel pump was crushing/caving in the gas tank. Now the filler hole is 4 inches lower and I have to get a new gas tank.
Caution note to the others that may not realize, if you hear the woosh, check to make sure your gas cap is venting, or replace it before it causes bigger damage.
Caution note to the others that may not realize, if you hear the woosh, check to make sure your gas cap is venting, or replace it before it causes bigger damage.