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Allis Chalmers Discussion Forum

Vapor lock on CA possible?

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Sel Larsen

06-30-2012 19:39:44

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My '55 CA which is restored to original has started to act like it is not getting enough fuel. Carb was rebuilt by Sandy Lake and worked fine but now our summer temps are in the near 100's. The fuel line from tank is original copper?? metal. Could it be vapor locking and if so, how would you prevent it? Sometimes fuel will drip out of bottom drain in carb intake ventury but not all the time. Carb is Zenith.

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07-01-2012 19:41:46

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 Re: Vapor lock on CA possible? in reply to Sel Larsen, 06-30-2012 19:39:44  
The original gas line was steel.
I was told a copper line will cause vapor lock.

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06-30-2012 20:53:43

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 Re: Vapor lock on CA possible? in reply to Sel Larsen, 06-30-2012 19:39:44  
If you remove the gas cap does it hurt or help??? Could well be a problem with the tank vent and building up pressure in the tank

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MT in Walford

07-15-2012 14:58:05

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 Re: Vapor lock on CA possible? in reply to old, 06-30-2012 20:53:43  
If you made the mistake of putting ethenol in it, and it had not had ethenol before, the ethenol will loosen up a bunch of crud in the tank and may be plugging the fuel flow from the tank. Or some crud got into the carb bowl. Ck the fuel flow for about a minute, when the engine is cold, take the fuel line off at the carb and let it run into a coffee can for about a minute to see if you have good fuel flow. I had an old IH truck once that I made the mistake of putting ethenol in and it took quite a while and several clean out jobs as the ethenol cleaned out the system.

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