Starting problem

[A//// Guy]

I had a similar issue with my old car and it was the ECU, the car would start up great sometime sn and then die others, I thought you replaced your caps though.

I would think most of the pressure is supposed to go down and release the gas back to the tank, but I didnt think it would depressurize down to 0. Although when Ive worked on fuel systems and taken the injector out of the rail it doesnt spray fuel everywhere, so there must be 0 pressure or close to it, otherwise when you take the rail off or pull an injector out it would spray everywhere.