I'm having a starting problem with my TPI setup. After is has shut down and I leave it for any time its hard to start. I chacked all the ignition side and everything is fine. I was checking the fuel pressure and I'm running an adjustable regulator at 45lbs as soon as you shut the engine down the pressure drops. So I turned the key on and as soon as the pressure gets up to over 45lbs I clamped off the pressure side hose and the pressure drops. So I clamped off the return side and then turned the key on and waited to the pressure came up and clamped off the pressure side and the pressure holds. I'm thinking the regulator has failed. Any thoughts??

 

If you pinch the return side while the pump is priming and the pressure rises.....that just eliminates the pump as the culprit. You saying that the pressure holds when you pinch the return leads me to believe that you are correct in your assumption regarding the regulator. It doesn't prove the regulator is bad just that the pump is okay.
Don't bother clamping off the pressure side. It proves nothing.

 

Yes. the pressure rises but as soon as the pump quits the pressure drops. I figured if i clamp off the pressure side as soon as I get pressure and it hold that means the injectors are not stuck open?? I'm off to the parts store tomorrow and get a regulator kit. Looks like 40 bucks for a kit.. Seems kinda high..

Thanks for the help. Mitch