96 Yukon-2 questions-I need help

[gmchevy]

Where is the daytime running ligths relay located exactly?

Next big question, fuel pump making noise and I replaced it 1-1/2yrs ago. I show 56psi and book says should be 60psi min. Before I do that I was going to put a new fuel pressure regulator on. Is this mounted under the intake manifold and is it a quick job? Never done one or taken the manifold off.

Any other suggestions would be great. What is happening is sometimes the truck won't start like it is not getting gas. Hasn't stranded me yet but close. I can' t believe the pump has gone bad already. It is making a grinding vibration and not a whirring noise like when it was new. I put in a Airtex 3932m pump/module from autozone ($200) cuz that was the only one in stock at the time around town

[gmchevy]

Wwwwwweeeelllllllllll, Obviuosly those aren't 2 popular questions!

Found the relay, must be bad, not gonna fix it.

Fuel pressure regulator is under the intake and it shouldn't be that big of a job.

Since the fuel pump is making noise I guess I am going to replace it after I do the regulator. This time a Delphi is going in and not the junk Airtex.

Thanks

[jdmccright]

If it's anything like the Jimmys, the fuel pressure regulator is under the plastic intake plenum on the back side of the injector assy...couple of hours at most. And there have been reports of aftermarket fuel pumps (AutoZone, Advance, etc.) not being as good as the OEM units...as big a PITA it is to replace them, they say the extra money is worth not having to change it again for a long time. Good luck!

[gmchevy]

Well, after new fuel pump and fuel pressure regulator and fuel filter are installed truck runs great. Only problem is that now sometimes it will not start. When it was started it has 52-54 psi on the fuel rail test port. I am guessing that because it does not have 60 psi the injectors are not firing? Even driving down the road the gauge only reads close to 60 under load.

I will probably try to blow the fuel lines out to make sure there is no restriction. Can anybody think of anything else to possibly try besides a match? I really don't think the lines are plugged in any way but I can't think of why the pressure is not higher.

HELP!!!!