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I also have this problem. Did you finally resolve it? I have an 81 SC, drives perfectly and starts when cold, but a hotter day, and sit for a few minutes and it's real hard to start. It takes about 6-8 tries and eventually sputters to life - like vapor lock?
This problem has been sort of intermittent for a few years. A shop checked my residual fuel pressures and said they were fine. It drove fine for awhile, but it seems to have returned with the hot weather.
I've read somewhere that the fuel accumulator is a part that should be replaced periodically. Mine is original to the car. Should I replace mine?
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1981 911SC, Guards Red/Black Leather
2014 Audi A6 Prestige, Phantom Black Pearl/Black Leather, Black Optics
2017 Tesla Model X
Gone but not forgotten: 1969 Datsun 2000, 1973 914 1.7, 1976 912E
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