98 Camaro 3.8L Conv. stock

I have a Sutton Engineering fuel injection cleaning kit that consists of a fuel pressure gauge that attaches to the schrader valve on the fuel rail and a screw-on pressurized fuel injector cleaner aerosol can that attaches to the other end of the fuel pressure gauge with a shutoff valve. I try to clean each of my vehicles injectors each year as preventive maintenance. I removed the fuel pump relay and the car runs off of the fi cleaner can. My problem is that the car would not run very long off of the can. After the car stopped, the fuel pressure dropped to 0. It should stay pressurized. I closed the shutoff valve on the fuel pressure gauge, plugged the fuel pump relay back in, and checked my key on, engine off fuel pressure. With the key on, engine off, the fuel pump runs for a few seconds as expected, the pressure is 50-55 psi which is normal, but within 3-5 seconds, the pressure is back to 0. The pressure should hold. The check engine light was on a few months ago and the dealer told me it was the fuel pressure regulator which they replaced. Anyone have any idea why my fuel pressure is not holding? Maybe the fuel pump? I used the pressure gauge on my other vehicles and it worked fine and the pressure holds.

Drew

 

Leaky injector, bad regulator, bad check valve in fuel pump. Take your choice & go at it.

 

i would hit the check valve first...........