<TABLE><TBODY><TR><TD vAlign=top width="100%">I live in Southern CA and I have an 97 F-150, 4.2L 6 cyl, 5 speed, with 57,000 original miles. I have a problem starting the truck in very hot weather. The engine cranks fine, but won't turn over. It seems like it's not getting any fuel. I have already replaced both the fuel pump relay and fuel pump cut off switch thinking they might be the problem. but this has not fixed the problem. Again, this only seems to occur in hot weather like 95-100 degrees plus. Sometimes if I wait 3-4 hours or until the weather cools off, it will start.


I really don't want to replace the fuel pump if I don't have to. Has anyone experienced the same problem? Does anyone have any suggestions?

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try turning on the key and waiting 3-5 seconds before attempting to start the engine.
This will give the fuel pump time to build pressure. If your problem goes away, then you have a reasonably good indicator that the fuel pump is the problem.

You could always leave someone check the fuel rail pressure.

I tend to think the OBD II would catch low fuel pressure.

Maybe a problem with the Idle Air Control hardware?

 

Check this post...

https://www.ford-trucks.com/forums/6...when-warm.html