2000 Sierra 5.3 Won't start when hot

[tdub88]

The truck starts fine when it's cold, just a slight bit of hesitation then fires right up. When it's been driven for a while it just cranks. Starter is fine, battery is fine. It just started doing this out of the blue. Fuel is coming out of the schrader valve - I know I should probably do a fuel pressure test. The truck has been running fine. I checked the vacuum line to the FPR, it's bone dry. I searched the forums, but none of the "won't start" threads applied. I'm surprised this hasn't come up before. TIA.

[rjgti]

any pending codes?

[tdub88]

no codes. Checked all the fuses and fuel filter was changed about 4 months ago. Is there a way to check the fuel pump without removing the bed?