I know alot of people have had this problem and the searching didnt turn out too good.
Slow starting.....easy to crank, just takes a while to start, couple of secs....
Replaced Fuel filter.....120,000 on pump.
Been doing it for a while, no other problems, runs great and drives great.
The pressure, when priming goes up fine, But then falls very fast. To 0 in the matter of seconds.
No fuel coming out of the vacum line or regulator while running, pressure is also great while running and with the vacum line off.
Is this the pump or a leaky injector?
How do I diagnose either way?
Thanks in advance!

 

It's common for the check valve (internal to the fuel pump) to fail and would cause your pressure not to hold. Check Shoebox's site, he may have a diagnostic procedure.

 

Thanks for the response, I have heard alot about this check valve, but also thought it would make sense if an injector had a leak, it would do the same, just looking for a way to check to diagnose.
I will check Shoebox's site....

 

You can check for an injector leak by pulling the fuel rail/injectors and pressurizing the fuel system. Any leaks will be very visible. Obviously you don't do it when the engine is hot, and you don't try and start the engine