Originally Posted by andrewwynn

FPR is very very rarely at fault in these situations.

Do you wait for the fuel pump to charge before turning to start? Eg. Click the key to the on position and wait for the him to stop under the back seat. Then turn the key to start.

If your warm start is within 30 minutes the fuel pressure should hold at 50 psi. You can check with an tire pressure gauge as long as you have one you aren't too concerned about being perfectly accurate for tires. I'm not sure what gas will do to the internals but my spare digital gauge read 49.5 on my fuel rail when I checked it.

Not sure why cold start is more reliable unless the auto start runs longer on a cold start.

My first suspect is the one way valve on the pump is not holding pressure when not running. If you wait for pump to charge before starting and it starts more reliably then even more likely.

Check the fuel rail pressure while idle should be 50psi. Then check after it's been sitting 30 then 60 minutes.

Get the battery tested for CCA and try to get a current reading on the starter.

About 20-25% of the threads that start like yours it's the starter. I've seen at least five cases where somebody replaced the battery the alternator and the fuel filter / FPR before they finally discover it was the starter the whole time.

When the starter soft fails it will slowly take more and more current to operate. It loses more voltage on the wire and internal battery resistance so less voltage so slower crank.


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