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Allis Chalmers Discussion Forum
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Vented gas cap

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Texas Denny

11-10-2005 05:55:40




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Odd how age tends to build stupidity. I've had trouble with my D-14 running out of gas when it should still have gas in it according to the gauge (but it would be low). Actually it's plagued me at least a half dozen times or more and usually out in the field. Even after adding gas, I still had to loosen the settling bowl to get it filled. A couple of days ago, it did it again. This time, I loosened the settling bowl first. When the gasket seal broke loose, I heard the sound of air being sucked into the tank. My problem was an unvented gas cap. Now that I know the problem, I can't believe that I overlooked something so obvious (for a couple of years!).

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farmerwannabe

11-10-2005 09:39:41




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 Re: Vented gas cap in reply to Texas Denny, 11-10-2005 05:55:40  
Hey Denny, I had the same problem. I went ahead and switched to a vented gas cap and haven"t had another problem with THAT, however I do worry about using the unvented cap on the radiator being this B isn"t a pressurized unit. Any thoughts about this?



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Texas Denny

11-10-2005 12:51:56




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 Re: Vented gas cap in reply to farmerwannabe, 11-10-2005 09:39:41  
I think you could use a 5# cap. They are hard to find. The 14# caps used on cars is too high. I think you would be better off (if 14# is all you have) to poke a hole in it.

My 52 Ford flathead had a 5# cap on it when I got it. About the most likely bad thing that could happen is to blow a water pump seal on a car or a tractor. Have never myself or have I heard of anyone having a problem and determined that the cap was the problem.

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BCnT

11-10-2005 08:16:46




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 Re: Vented gas cap in reply to Texas Denny, 11-10-2005 05:55:40  
dont feel bad...i got that tee shirt too...only my vented cap had stopped up...solved problem with a 1/8'' drill bit...good thing the fords got a hood ;)

btw that settling bowl will have a air pocket until the float in the carb drops...then it will fill up



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JMS/MN

11-10-2005 07:14:11




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 Re: Vented gas cap in reply to Texas Denny, 11-10-2005 05:55:40  
If it is hard to get a tight seal on the glass bowl, and the carb has a petcock in the drain- just open that. Or take out the drain plug or crack a line loose to fill the bowl. They are often difficult to seal.



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