[Gmecm] 93 CHEVY g20 VAN

[Robert W Hughes]

> Chevy pickup 2000 5.7 liter
> The fuel pressure regulator (1) is a
> diaphragm-operated cartridge type relief valve with
> the fuel pump pressure on one side and the regulator
> spring pressure and intake manifold vacuum on the
> other side. A retainer clip (2) holds the fuel
> pressure regulator in the fuel meter body assembly.
> The fuel pressure regulator maintains a constant
> pressure differential across the injectors at all
> times. The pressure regulator compensates for engine
> load by increasing the fuel pressure as engine vacuum
> drops.

engine vacuum drops = manifold absolute pressure rises
engine vacuum is commonly measured in inches of mercury where 0inHg = 
atmospheric pressure (vacuum dropped all the way);MAP=14.7psi and 30inHg 
= about complete vacuum(high vacuum);MAP=0
in other words fuel pressure does rise as manifold absolute pressure rises

-- 
Robert W. Hughes (Bob)
BackYard Engineering
29:40.237N, 95:28.726W or perhaps 30:55.265N, 95:20.590W
Houston, Texas "The city with too much Oxygen"
rwhughe at oplink.net