[Gmecm] 93 CHEVY g20 VAN

[Mike V]

Hi Jay,
there is a possibilty of a "dead-head" reg like those on a torch tank, but
I have a LR4 (4.8 LS1 family) engine on the stand, and it has a return line
on the reg.  Are you sure the LS1 has no return line?  The
Mike V

At 06:53 PM 1/1/2006 -0500, you wrote:

>I understand the "traditional" fuel line/regulator/return line system 
>(i.e. TBI, TPI, etc.) where fuel constantly flows through the fuel line, 
>through the regulator, and back through the return line.
>
>On something like the LS1 that has a single fuel line and no return, how 
>is the pressure controlled?  I would have expected a PWM-driven pump and a 
>fuel pressure sensor, where the PCM controls fuel pressure in some form of 
>closed-loop control.  From WopOnTour's description, this is not the case.
>
>So, now for two questions:
>
>1)  How does the single fuel line system work -- how does it maintain a 
>constant relative pressure across the fuel injector?  If the pump has 
>constant power on it, does it just "deadhead" against the injectors?  If 
>there is a regulator, how does this regulator work?
>
>2)  Could such a system be adapted to older EFI systems like a TBI or TPI 
>swap?  Could a single fuel line system be made to work on a TBI or TPI 
>install?  I assume this would mean either some code patches to the ECM 
>(i.e. a BPW adjustment based on MAP to compensate for the change in 
>pressure) or a standalone controller that would read fuel pressure and 
>adjust pump power accordingly.
>
>Jay Vessels
>1982 Chevrolet S-10 Sport, 2.8V6 TBI
>1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI pending)