I now know that a primary fuel rail from a 1991 car will work in a 1st gen.

HOWEVER.

The fuel pressure regulator for the 1991 cars are in the secondary rails.

So, to solve the PD problem by using a 1991 fuel rail, i would have to place an aftermarket fuel pressure regulator inline on the way back to the tank, right?

Would this solve the problem?

 

Sniper,
Yea, I think that would solve your problem, but it is kind of an expensive way to do it. You could probably run without a regulator and I don't think it would cause you any huge problems. Or, what's the chances that a second gen secondary rail would also fit?

Are you saying that a 91 primary rail will fit without modification? I would like to know, because I am heading the same way you are with my GSL-SE. Although, I might just throw away the PD and replace it with a banjo bolt.
hanman

 

Yes, a 1991 rail will fit just fine....

However the idea that a SECONDARY rail will fit too won't work.

This rail is larger and the injectors ar in the intake, not the block.

And no, you CANNOT RUN WITHOUT A REGULATOR!!!

You MUST HAVE high pressure behind the injectors or they wornt work at all!

Thats how they spray fuel.

So, The big question is...
What is the factory pressure in the fuel line thats required to fire the injectors.

Mine (on a 1991) is 40psi.

I would think that yours would be the same if not just a bit higher or lower.

Whats the pressure?

(And please note, that its MUCH HIGHER than around 10psi.

Thats for carburetors.

TBI and Fuel Injection needs around 40psi.

 

10 psi on carbs . Try 3-4 psi .

 

the 10 mpsi was MAX for carbs.

 

The Haynes manual says the fuel pressure is something like 50-72psi. I think standard is something like 3 bar (~48psi) for most EFI (that's usually what injectors are rated at).

40 PSI sounds ok, but it might be a little low... can you fit the GSL-SE regulator on the 2nd gen rail?


maybe replace the pd w/ a banjo bolt, I don't think it does much.

--matt