97 tahoe no start

[1997tahoe]

I have 97 tahoe with 80k miles. about 2 months ago i replaced the fuel pump(using a oem pump) for a no start. now the truck again cranks and won't start. no fuel pressure .
i started to diag vehicle and found no power to fuel pump relay. looking through the wiring diag i see power comes through an oil pressure switch. I tried replacing the switch and vehicle still has no power and won't start. the wiring diag i have is limited. does anyone have any other suggest of things to check.
thank you

 

[Colabella7077]

Does it turn over? have u checked the fuel lines?

 

[mygreen98]

maybe relay itself is bad. remove it and make sure there is 12v + at 1 terminal. if there is a same relay for the horn or something else thats not needed to run truck, swap it and see if it will run.