Hi i have a 2015 silverado with the 5.3
we had a fuel leak on the fuel line at sending unit.
I ordered a new fuel pump with the sending unit. I changed it out hooked everything up with no leaks. At first it ran fine then it started wanting to stay running for acouple secs after you turned key off. Then that started to get back to normal but now it's running real bad. It wants to die at stop sign or red lights unless you use 2 feet to drive left foot to hit iwouldbrake and right foot to feather gas to keep it from dieing. I went to check fuel pressure and i can't find the Schrader valve to hook my fuel pressure tester up on. I've looked under plastic motor cover stuff . I've followed fuel rail and i still don't see anywhere to attach my fuel tester. If anyone has any ideas i would really appreciate the help id really like to see where the fuel pressure is and go from there.
thank you for any advice in advance