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drving and then stalling

Electrical

Model: 911T targa, Year:1972, Mileage:88000, Type of use:Street use only
Hi there, I recently started encountering a problem..well actually it began late last year before the car went away for the season. When I bought it 5 years ago and drove it, it popped and backfired quite a bit (webber carb conversion) since that time I've been slowly learning to adjust the carbs and have systematically been able to reduce the backfiring to start up and warm up. Otherwise, it pulls clean has great acceleration (though now and again after warm up I may get a little pop but nothing compared to before. Just before putting the car away last year it had been idling in the driveway for about 10 minutes when it stalled suddenly. I didn't think much of it but it wouldn't turn over right away either after that. Though I could smell gas in the engine area after pumping for a while. At any rate, a few days later I was driving for about 15 minutes down the road when it totally stalled. I had no idea what had happened as the car essentially stopped. I pulled to the side of the road and had a bit of a spell getting it started again. Then drove home about 10 minutes w/o incidence. Flash forward summer 2010, it's happening now after I drive the car for about 15 minutes or so and it's very sudden. After leaving the car for about 1/2 an hour it starts again and I can get her home. Needless to say, I'd love some advice. When I try to turn it over after it has stalled I notice the fuel pressure guage which has been installed between my webbers is the same. So it looks as though the pre-stall pressure is the same as the pressure as I'm trying to get her going again, plus I can smell the gas in the engine compartment. I'm pasting a question fromt he archivesand was wondering if this might pertain to me or do you have any other suggestions. There is not a soul that I know of in the Peterborough, Ontario area who works on these cars so I feel rather stranded. Thank you, Sincerely, David Johnston Engine stall 911 2.4, 2.2 and 2.0 | EngineVehicle Information: Model: 911 T; Year: 1972; Body Type: Targa; Engine (type, size, modifications): Original, with MFI; Total Mileage: 53,000; After driving for about 20 minutes at roughly 80 mph in 105 degree heat, my dependable baby stalled out as I drove down the Interstate. After cooling down for about one hour she started up and rode home without incident. The only explanation that I can come up with is vaper lock. Is that likely? Do you have any suggestions?Tim Powell [DAK]7/28/2006 5:33:22 PMIt is very unlikely that your MFI car is vapor locking, not impossible, but unlikely. Have you recently been able to drive at that speed and distance in cooler temps, if so that would probably rule out what Im about to offer. There are two, more common faults that can have symptoms such as yours that are not related to temperature. The most likely is a clogged in tank fuel filter, running at that speed for that amount of time, a partially clogged filter wont be able to keep up, but after sitting for awhile fuel will seep thru and let the engine run again. Another possibility would be a failing ignition coil, which will get hot from electrical resistance, shut down, and then work again after cooling off. Was the shutdown immediate or gradual, generally fuel problems are somewhat gradual compared to the usually instantaneous ignition fault. If it is a fuel tank filter issue, your trips will probably slowly start getting shorter! Ed Mayo - PCA WebSite - 7/30/2006

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