I was driving my truck one morning and parked it at home then tried to leave a few hours later and ever since ive had a crank but no start. I replaced the fuel regulator and fuel filter. Ive checked spark and fuel. I have spark for sure. Yet, when I hooked up fuel pressure gauges It read 0 PSI in the key on engine off position and as well when trying to crank it. I know that my fuel pumps are getting power based off sound. I plan on disconnecting a fuel line by the filter and cranking the motor to see if the pump forces and fluid out tomorrow. If anyone's had this problem or knows anything to check or test I would appreciate the help.

 

. My bet is a bad pump or your gauge..Just because you hear it doesn't mean it is delivering.If you measured no fuel pressure, I don't see what you plan to accomplish by disconnecting the fuel line. You could try spraying starting fluid in the throttle body just to verify an attempt to start. You need to see if full power is present at the fuel pump. When working, you should see about 30-45 psi at the shrader by just turning the key on.

 

I plan on disconnecting the rear fuel line (behind the filter) so that when I crank it fuel should come out with some force. This is to check my fuel pump and see if its working because I know its getting power. A little messy but im unsure of how else to check the working ability of my pump without stripping the bed.
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Consider getting hold of a fuel pressure gauge and connecting it to the schrader valve on the engine fuel rail

Two things to keep in mind, today's gasoline is not good to keep having contact with your skin, and gasoline all over the place is setting up for a possible accident.
Never use an electric drop light under the vehicle when working on gas lines. Gas hitting that hot bulb is asking for trouble. Use a battery operated lamp or flashlight instead.