GM Model 700 Throttle Body

[Orin B. Harding]

>that is regulator output pressure i have a haynes too 
>remember that car uses an intank pump that easily will generate 40 psig 
>when new  the excess fuel is returned to keep the tb and lines cool.
>its not easy to generate those pressure levels without an intank pump
>this was  disscussed a while back on this very forum.
>question : are you using the mgs original fuel pump does yours 
>originaly have an electric one ?   are you using the return line
>on the t.b.?

No, I'm not using the original pump..I'm using a Holly pump that they supply 
with their ProJection throttle Body injection system and I have installed a 
return line from the TB to the tank..The GM700 pressure regulator adjustment 
screw has been spot welded in place so I am going to drill out the spot weld 
and replace the screw so I can make pressure adjustments...I think the 
pressures you're talking about would be "dead headed" pressures and not 
"regulated" pressures.  To adjust the pressure a guage would be placed in 
the supply line and with the return line connected, the pressure 
adjusted...Look at the Haynes book again and I think you'll see what I'm 
talking about..
Orin Harding - Greensboro, NC
('74 MGB-GT - '79 MGB Roadster with Electromotive TEC II)