putting a wild fuel injection into my truck
well my f-body is still stock, but my tahoe is getting a monster of an engine.





now my problem is, I'm running a tpi style throttle body and of course, my truck wasn't setup for it. right now I'm confused with all the little fittings on my throttle body

now these lower ones, I'm guessing are for coolant





I have two fittings off my factory waterpump figured I could get an answer from the truck board as to which side is the inlet and outlet on the waterpump. I'm guessing that my heater hose (the non threaded one, just a bare hose end, threaded one goes to the manifold) goes to the side of the fitting on the bottom of the throttle body, and the forward one goes to an inlet of the waterpump so it will have some sort of suction. (trucks run a serpentine just like f-bodys, anyone have a guess as to the driver's side or passenger side being the inlet with the engine rotation?)

then i get these little suckers the black ones next to the tps...what the heck are they for......they open into the bores of the throttle body, so I know they can't be coolant, maybe some of that air pump crap?



figured in my situation I should just plug them up, right? otherwise I'd have a vacuum leak, which won't work well with 15 lbs of boost from teh procharger F1 I'm runnin

another quick question, I have a set of 55 lb siemens injectors to go with my fuel rails, anyone know if I'm going to need those little retainer clips that I saw on a tpi fuel injector swap tech article? or would the o-rings be enough, I'm running an accel air gap intake plumbed for fuel injection, with the fuel rails that show in the first pic on the other post...

 

Those look like ported vacuum ports. If you are running boost then block them off. As far as the injectors go you don't have to use the retaining clips as long as the rail mounting is fairly rigid and keeps them firmly in place.

In my opinion those 90 degree fuel fittings are a bad idea. Since you are doing a dual in and dual out setup the small lines shoud be okay but those drastic bends are going to be a restriction.