p0452

What is your question?

Im working on my friends 01 gmc jimmy. It has a p0452 code. It has a long crank time and will start and run if i spray throttle body cleaner in throttle body. Fuel pressure is 45 to 55psi. After engine is off fuel pressure drops past 24 psi in less than a minute. I know regulator is bad but can a bad ftp sensor also cause a long crank symptom? The engine will crank and crank but wont fire until I use throttle body cleaner. Also is the ftp sensor attached to the fuel pump? Would it come with a new sending unit?