I know some of you are either current or X-GM mechanics. So here goes.
My dually is a '98 with the 7400 Vortec. I have a whole deluxe OTC fuel pressure test kit with all the couplers and such. Although one only needs the shrader valve connector. Anyhoo, I have been going through everything before this next season. I just did MSD plug wires and new AC replacement plugs. Now, I want to check the fuel pressure and make sure the pump is still along for the ride.
I never did buy a shop manual for it. What pressures should I see? Idle with vac connected (what's the normal pressure as it runs down the road) and also with the vac line off of the regulator?
I'm going to go ahead and replace the HEI module, cap, rotor, and coil - DUI Ignition has a bitchen replacement upgrade set for this specific application. I am now nervous about the pump, as the truck is 8 years old next month, but only has 78,000 miles. I will only have it until about July of next year, so I am hoping I don't end up doing the pump. I just want to see what pressure(s) it is putting out or not putting out.