Does anyone know how the fuel system works? Does the fuel go into one fuel rail and out the other? or does it go in both fuel rails? Also I am using stainless steel braided lines to put the LT1 into my 83. Does anyone know what size lines would be good? (width wise)

 

The fuel is dumped into the fuel rails from the fuel lines hooked into the side of them, then the fuel goes into all the fuel injectors, 4 on each side.

 

is there no return line on LT1s>?

 

The three lines going to the intake manifold are for fuel delivery, fuel return, and carbon canister purge. A fourth line goes from the carbon canister to the fuel tank.

 

No exactly....

The fuel from the supply line goes in the back of the passenger side fuel rail, to the front of the rail, through the diagonal crossover line, down the length of the drivers side rail to the back, where the fuel pressure regulator is mounted. The fuel pressure regulator allows enough fuel to return to the tank to maintain the set fuel pressure.... 43.5psi for a nonadjustable stock regulator. And the fuel pressure regulator has "vacuum compensation"... it uses the vacuum of the intake manifold to pull the fuel pressure down, so that it is constantly maintaining a differential fuel pressure of 43.5psi. In effect, the difference between the fuel rail pressure (inlet to the injector) and the manifold vacuum (outlet of the injector) is held constant, so that the same pulse width will always produce the same fuel flow, no matter what the intake vacuum is.

I run a 7,200rpm 381, with a dry 300-shot. I use a -6AN supply line, and a -6AN return line. I have modified the fuel rails, so that the supply line feeds the back of both rails, and the return is taken off a fitting welded to the diagonal crossover line at the front. In effect, where the stock system has to pass the entire fuel demand for 8 cylinders + return through the back of the passenger side rail, then for 7 cyl's after injector #8, then for 6 cyl's after injector #6, mine only needs to flow the fuel for 4 cylinders into the back of each rail + 1/2 of the return, in effect, doubling the capacity of the rails, and smoothing the differences in pressure between cylinders. I have no trouble support 800HP with two 205lph pumps, the -6AN supply and return lines and a Weldon AFPR. I do run at 4bar (58psi) and I'm using 64# injectors (in effect, 74# at 58psi).

 

how would you reccommend hooking them up for my application? i tried to ook at my cousins lt1 today but it is so compact there is no room tos ee anything. should i go with how the stock LT1 fuel is run or do it another way (your version)? either way i need some details.......all i have figured out is...


(main line) fuel rails---regulator---pump & filter---tank
(return line) where ever connected---tank

if anyone can give me soemthingh better please do