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EFV-8 Club Forum / General Ford Discussion / Vapor lock

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flathead48

07-12-2017 @ 4:39 PM

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A friends stock 40 will sometimes cut out and back fire after a long drive at 50 Mph , than it smooths out and runs fine. Will vapor lock cause the back firing ? Thanks

sarahcecelia

07-13-2017 @ 1:07 PM

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Doubtful

07-13-2017 @ 2:32 PM

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To me, the symptom you describe would be more related to a faulty condenser....

flathead48

07-13-2017 @ 2:55 PM

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Thanks guys I felt the problem would be electrical sine vapor lock normally happens at slow speeds. Thanks for the replays.

len47merc

07-13-2017 @ 3:05 PM

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flathead48 - enable private messaging when you've a moment.

Steve

flathead48

07-13-2017 @ 6:29 PM

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Steve, my pm should be working according yo my preferences. If unable to contact my email is rblinc66@gmail.com thanks, Rick

flathead48

07-13-2017 @ 6:36 PM

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Steve, my pm should be working according yo my preferences. If unable to contact my email is rblinc66@gmail.com thanks, Rick

Drbrown

07-13-2017 @ 10:11 PM

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When I get vapor lock (rare) engine totally shuts down. Options: (1) Wait 5 or 10 minutes cool off - starts/runs fine .... or (2) turn on my Airtex auxiliary elec pump. My 59AB has a crab dizzy recently built by Charlie NY - no problem with that.

len47merc

07-14-2017 @ 4:46 AM

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flathead48 - when did your friend's backfiring problem start? Has he been driving the car recently and this issue just showed up, or did some event take place (engine work of any kind, overheat, etc.) after which the backfiring showed itself? And how long (time and miles) has it been since any work was performed on the engine and what was that work if you or he can recall?

The Forum will gladly help with processes for the diagnosis and determination of root cause if you are interested - answers to the above questions will help, otherwise it's like throwing darts a bit blindfolded.

In general vacuum leaks and/or incorrect timing causes backfires.

Steve

This message was edited by len47merc on 7-14-17 @ 5:04 AM

flathead48

07-14-2017 @ 5:37 AM

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Steve, this car was totally restored and engine completely rebuil by a excellent shop he told me car never runs hot but on occasion when he is driving long distance at 50 mph or so it will cut out and backfire than clears up and runs fine, someone told him it was vapor lock I disagreed the car does not overheat at low speeds , in traffic and never stalls out. My expierence with vapor lock your car just quits always in traffic at slow speeds. Thanks to you for taking the time and to everyone who has responded , I will pass on these ideas to him. Regards, Rick

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