About 3 months ago I was towing a car with the 'Burb and once I got to my destination I turned it off and it never started again unless with starting fluid. Took it to my mechanic who diagnosed a bad fuel pump only putting out about 40psi. About $550 later I had a new pump installed along with a fuel filter. It ran great for about 5 days then I noticed after sitting overnight you'd have to crank it 3 or so times before it fired. It'd fart then stall, fart then stall, then fire and run like nothing was wrong. Check engine light came on for P0452.

I went and rented a fuel pressure test kit and after hooking it up and flicking the key it stayed at 0psi. After the 4th time flicking the key on and off it went up to about 10psi but would go no further. I cranked the engine and after about 4 seconds it came to life and the fuel psi gauge went up to about 55psi. Revving the engine boosts it to about 58psi but no higher. Shutting the truck off it shot up right to 60psi then bled off pressure at about 3psi per minute.

Is this the new fuel pump going bad already? Or I was curious if this could be the fuel pressure regulator. Hopefully not though because that seems like a ton of labor to get that intake off to replace it, and if I'm going to do that I may as well replace the CSFI module with the upgraded MPFI one. I don't mind having this done but I'd definitely have to save up for a while as this is my fun truck and the daily driver takes the wallet priority haha.

 

Spider injectors in '99 were not so great. They came out with updated injectors. I had to replace mine in my old '99 5.7 Yukon due to injectors leaking fuel into the motor when parked causing hard starting.