[GT55]

First off, after the vehicle runs for a while, turn it off it won't start back up. So here is what I did. Hooked up a fuel pressure gauge at the back of the plenum. Turn the key on and listen to the fuel pump whine for 2-3 seconds. As fuel pump is whining the gauge goes to about 55-60 psi. When the fuel pump rely clicks and the fuel pump stops whining, the pressure gauge falls to about 20 psi and stays there. I split the plenum and did this test again. The pressure gauge gave the same readings and there were no leaks anywhere in the plenum.
If this is a fuel regulator problem, how can I check it? If it is a fuel pump problem, how can I check it? If it's something else please advise...

Thanks All...

GT