Quote:
Originally Posted by ABDow
I am having a similar problem with my 1971 280 SE 3.5. Once the temperature gets above 180F (which it does on a hot day in Adelaide with the a/c on) the car will not restart after stopping until the temp drops to about 175 F. Then it starts and runs perfectly normally. If I remove the fuel pump fuse the car starts and runs for a few seconds until I put the fuse back in again and then the engine stalls. Sensor II is showing the correct resistance. I suspect a fuel pressure problem. I've checked the fuel pressure at 175F and it's 30psi when the car is running. I have yet to test the fuel pressure when the car is refusing to start, but I am starting to think that it might be that the fuel pressure is too high or too low. Is the fuel pressure regulator likely to be affected by heat?
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Usually when you have a hot start problem like that, it is because the engine is not getting enough fuel (vapor locking). So it is puzzling why the engine runs when you disable the fuel pump.
The attachment needs some work still, but is something I put together based on info from various sources on hot starts and vapor locking.
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Graham
85 300D
,72 350SL, 98 E320, Outback 2.5