Vapor lock, hot fuel pump - The 1947 - Present Chevrolet & GMC Truck Message Board Network

walker · 07-19-2004, 11:15 PM

I am having troiuble with my stock mechanical fuel pump boiling the fuel. When it gets hot out (130*+ on the highway) the fuel pump stops pumping. I can duplicate it at home by just letting it idle with the hood closed for a while. The fuel in the clear fuel filter disappears and the squirts from the pump get smaller and smaller then just stop. I poured a little cool water on the fuel pump and it stars pumping immediatley. I replaced the steel line going to the carb with a rubber hose, but it didn't affect it at all. I also checked the fuel cap too.
Any suggestions would be appreciated. I would like to not have to change to an electric pump though.
Thanks, Andy.

07-19-2004, 11:15 PM	#1
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	Vapor lock, hot fuel pump I am having troiuble with my stock mechanical fuel pump boiling the fuel. When it gets hot out (130*+ on the highway) the fuel pump stops pumping. I can duplicate it at home by just letting it idle with the hood closed for a while. The fuel in the clear fuel filter disappears and the squirts from the pump get smaller and smaller then just stop. I poured a little cool water on the fuel pump and it stars pumping immediatley. I replaced the steel line going to the carb with a rubber hose, but it didn't affect it at all. I also checked the fuel cap too. Any suggestions would be appreciated. I would like to not have to change to an electric pump though. Thanks, Andy. __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold



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