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07-09-2023, 08:19 AM | #1 |
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Join Date: May 2020
Location: Germany, in Coburg (Bavaria)
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Problems restarting with warm engine on incline
I have the following problem at outside temperatures above 86°F . I drive a longer distance. Then I turn the car off for about 30 minutes. After continuing to drive (I drive for 5-20 seconds) the engine cuts out. Usually slightly uphill on a small incline. The engine can be restarted with a lot of gas. But it is always a commotion and hinders the traffic. What can be the cause?
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07-09-2023, 08:37 AM | #2 |
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Re: Problems restarting with warm engine on incline
clog at the shut off valve........
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07-09-2023, 09:23 AM | #3 |
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Re: Problems restarting with warm engine on incline
The notorious vapor lock ?! When its hot outside and my A is hot, when restarting and she doesn’t fire right off I pull the choke for a couple of cranks and she fires, revving the engine and everything is back to normal !
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07-09-2023, 10:11 AM | #4 |
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Location: Pennsylvania
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Re: Problems restarting with warm engine on incline
I agree that it is probably vapor lock. While you are driving there is air moving through the engine compartment that keeps the fuel line and carburetor body cool enough to prevent the gasoline from boiling. When you stop the car the heat builds up and causes vapor bubbles in the fuel line because they've become too hot.
Some "cures" I've heard about for vapor lock (I don't know if any of these actually work): add Marvel Mystery Oil to the gasoline (it's supposed to raise the boiling point), insulate the gas line from the tank to the carburetor with aluminum foil, clip clothespins to the gas line (I can't begin to imagine how this can work) and finally, use ethanol-free gasoline. |
07-09-2023, 10:37 AM | #5 |
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Join Date: Apr 2011
Location: Davenport, Iowa
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Re: Problems restarting with warm engine on incline
Remove the gas cap and try to start the engine. If it keeps running, then the gas cap's air vent is clogged or missing. There is a distinct radiator and a distinct gas cap, the former not being vented. If someone installed a radiator cap on your gas tank (they will fit at either location), that interfers with the gravity flow of fuel to the carburetor because no air can get inside the tank to "push" the gasoline out. This would be especially possible on hot days.
Marshall |
07-09-2023, 11:12 AM | #6 |
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Re: Problems restarting with warm engine on incline
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Also make sure the fuel cap is venting properly Last edited by Patrick L.; 07-10-2023 at 10:51 AM. |
07-09-2023, 11:55 AM | #7 |
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Location: Oregon
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Re: Problems restarting with warm engine on incline
Ethanol in gasoline increases your chances of vapor-lock.
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07-09-2023, 02:04 PM | #8 |
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Join Date: Aug 2018
Location: Rubicon, Wi
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Re: Problems restarting with warm engine on incline
Ober,
What I have found to cure this is shut off the gas valve and let the engine empty the carburetor. When you get ready to go again you have fresh, cooler gas in the carb and it restarts and runs without problems. Dale |
07-10-2023, 07:10 AM | #9 |
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Location: Marana Arizona
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Re: Problems restarting with warm engine on incline
Loosen the gas cap as Marshall said. Hope that's the issue. Chap
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07-10-2023, 11:14 AM | #10 |
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Join Date: May 2020
Location: Germany, in Coburg (Bavaria)
Posts: 24
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Re: Problems restarting with warm engine on incline
Thank you very much, I got the following advice from a friend: add 5 percent diesel to the gasoline.
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07-10-2023, 11:29 AM | #11 |
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Location: Largo Florida
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Re: Problems restarting with warm engine on incline
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