[TEGGSRB18C1]

Originally Posted by TEGGSRB18C1

these are definitely 2 rails off 2 different trucks but it really doesn't matter. They match physically

Incorrect sir. The passenger side rail accepted my original cleaned injectors and slid into the intake manifold no problem. The driver side did not, the injectors hung above their respective ports on the manifold over 1/4"....WTF.

Upon closer inspection, the driver side came with much longer injectors and these ridges on the mounting ears. After some research, this rail is for a much later flex fuel model, so if anyone stumbles upon this thread looking to do the stainless steel fuel crossover upgrade, if it comes with these ridged ear rails, the will not work with the early model 99-01/02 intake manifolds. They have to be flat.

After that I had our parts department at work try and track down just the driver side rail. God bless them they tried but this part is gone the way of the dodo. Used is my only recourse here. We got a hold of a local yard that had quite a few GMT800's on hand and explained my issue. The first rail setup they sent was promising but after breakdown I discovered that rail was shaking as well, not as bad but I'm not going through all this for "not as bad"

We did some more research and found that the 02+ rails may have fixed that issue from the factory. They found an 02 Avalanche and bingo, driver side rail quiet as a mouse. I finally have everything I need to move forward fuel system wise. Please indulge me a little bit with my photos, I have so much time and energy into researching this stupid problem and GM's varying changes over the years.

Again for anyone stumbling across this for your own GMT800 research: the real fix here is the intake manifold and fuel rail setup off of a Trailblazer SS. This early return style fuel system with the rail mounted FPR is a joke. It's an overly complicated POS that GM eventually scrapped in favor of a 1 piece design like found on our LS3's. It's not worth how much time you'll spend trying to sort through overpriced used crap. Trust me.

[TEGGSRB18C1]

For anyone who's read through this and said "This guy is chasing a misfire issue and hasn't said a word about plugs and wires? What an idiot" Yes, I did. Dad and I actually changed both before I had it towed to my house in some sad attempt in hoping it would fix the problem.

Since I was waiting on parts I pulled the wires off and pulled the plugs. Checked the gap and they were a hair tight so I opened them up, wiped them down and put them back in. I've had the passenger side buttoned up for almost a week now. That side fuel rail was good from my original ebay set so I set that in place and worked around it in wait of a properly working driver side rail.

First I ran my inlet #2 catch can line from the passenger side valve cover. This port originally fed into the throttle body right above it. When the coil bracket is mounted, access is limited so now was the time. I covered it in the same sheathing that I use for my ground wires for a cleaner look. This line has long run to make it to the catch can, I used some of the old throttle body coolant hose mounting tabs to secure it along the fan shroud. I'm not done but when the intake tube is on and I have this lined up the way I want it should look good.

The intake port on the throttle body from that valve cover will be capped off permanently and not used. I will be using the port on the top on the intake manifold as that seems like it would more properly disperse the outlet air from the catch can. In theory. So both valve covers will feed into the can, can feeds into the top of the intake manifold. Makes sense right? If I'm wrong someone please let me know.

Other than that I'm just kind of messing around with running inlet #1 catch can lines and ground wires for the most aesthetic look, wiping things down, making some adjustments. I'm still waiting on my actual catch can fittings (2 weeks now?) I did splurge and bought the Mechman 240A alternator I was eyeing up, which should be here next week. I just can't, after all this work, put that old tired grimy rusty ass pulley 90A Delphi back on there. I just can't. This should support my mild audio system and whatever accessories I tack on to this truck with ease.

I'm getting there. It's starting to look like a sea of plastic and wires again which is a good thing!