I recently purchased an 84 stock Vette. I was told the rear injector was bad. I replaced both with a set from a 94 Suburban. both are #5235206 they are 55 psi units. Im aware the rear unit takes a different injector(5233770)68psi, but in the interest of hearing it run with what i have on hand, I installed the good pair of 206's. My problem is that the diaphram on the front pressure regulator keeps blowing apart and spewing gas as soon as I attempt to start the car..( 2X now). Any Help? Thanks. (I've had over 45 vettes, but this is the first cross fire unit I've dealt with.)

 

I recently sold my 84 crossfire. It had an X-Ram and I rebuilt the T/Bs and was running a boost referenced fuel pressure regulator. Many mods on the car. The car ran very strong. Anyway I am regressing. You need to go to the crossfire injection vault, regester, and go on there. That site is dedicated to crossfires. Don't let anyone tell you that they are pigs. They can be made to get up and run if you know what to do. I shocked many tuned port vettes and some C5s. PS the stock manifold has to go or you are wasting your time.
To get you started look at my posts by " twospeed"
Take the time to do it right, forget "in the intrest of hearing it run"

 

Thanks. I'll check out the cross fire injection vault.

 

*I have been told that if my return line is clogged, It will cause full unregulated fuel pressure to flow to both throttle bodies causing the failure I'm experiencing.

 

That can get to be very expensive and some of those parts are very hard to find now. If its the return line that runs back to the tank you can blow it out with compressed air. Look to see if there is an in line gas filter on it first and see if that is clogged first, then disconnect it. You are going to have to disconnect the return line at the electric fuel pump before you blow it out or you may blow the pump up. Besides if the line is clogged you don't want to blow that crap back into the tank. You can access the fuel pump by taking off the gas door on the rear deck. Take the stuff off slowly or you will tear the rubber around the filler neck, remember its 23 years old. It sounds worse than it is. It really is an easy job, and it is stand up work no getting under the car. I would carefully disconnect the metal fuel lines from both T/Bs on the intake first to make sure there are no obstructions. Then go for the return line. Check out the X-Ram for that car it will really wake it up so it will get up and run. You will get better gas mpg also.