Fuel pump ?
My 1999 Gulfstream Triton V10, starts right up idle straight runs up good I drive around the block a couple times to warms up with my pressure gauge hooked up and it drops from 32 psi down to 10 when...
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It sounds like it's picking up debris in the tank and plugging the pickup tube. Whether it be the sock or dirt. After the 3-4 hours the obstruction drops back out. I had an old tractor that did this once. It had an oil bath air filter. Come to find out it had never been cleaned before I got it. it would run 10-15 minutes like a champ then die. I thought it was the fuel pump i tried everything then i took the boot to the air filter loose for something and started it up and it ran like a champ. That's how i found out about the oil bath filter. but it does sound like you have an obstruction somewhere. Good luck!
