need daily driver help
 

My daily driver is a 99 gmc with the 5.3. Lately it has been hard to start warm. Its starts just fine after sitting for several hours. Fuel pressure is at 45 pounds and bleeds to 40 right after shutdown.

Im not a fuel injection guy but does this sound like a pump problem? Shouldnt the pressure be about 60-65 pounds?

change your fuel filter

Fuel pressure with the regulator hooked up is in the neighborhood of 45-50lbs on those, unhook the vac line to the regulator on the drivers side, pressure should hit 55-60.

That was first thing I tried a couple weeks ago. Didnt help.

It is the fuel pressure regulator. Replaced tons of them on the GEN III engines with the same syptoms. Pull the vac line off. Is it wet inside? Sure sign of bad regulator.

99-2door - On the advice of someone else I pulled the vac line of the regulator but it was dry. Cold start is great but u wait about 15 minutes and it acts like it flooded. Is there any other way to check the regulator?

If I borrow my friends fuel pressure gauge again, what shout the pressure do when the vac line is removed from the regulator. Should the pressure go up or down?

99-2door. rechecked the regulator after it had sat for about 2 hours, yup, fuel came squirting out. THANKS for the help.