| Vapor Lock [message #102794] |
Wed, 13 October 2010 11:44  |
captjack
Messages: 271
Registered: February 2010
Location: Sebastopol, California
Karma:
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Senior Member |
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I've been pondering my recent vapor lock experience. I do have an one of JK's electric fuel pump/filter setups installed. Based on the success of in-tank fuel pumps and the impressive work of Emory Stora, I'm guessing that the problem in my case occurs due to fuel vaporization in the fuel hose between the tank and my JK fuel pump and that if I could deliver liquid gas to my JK fuel pump, I'd not have a problem. That got me to thinking about the ECS vent system between the tank and the canister which prevents pressure buildup in the gas tank. This system didn't exist in the old days. Gas caps formerly had a vent to allow air only to flow into the tank to prevent collapsing the tank. The result was that on hot days (when vapor lock occurs), there was pressure in the gas tank which raised the boiling point of the gasoline which means less possibility of vapor lock between the tank and the fuel pump. So, it seems that blocking off the vent from the tank to the canister might return us to the old days, allow pressure to build in the tank, and possibly reduce the vapor lock problem. Although this could increase emissions, I can only see this happening when the cap is removed from the tank so the increase would be slight. Capturing emissions from the carb would still occur which is probably the major culprit. Am I way off base here?
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
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