BOWTYDE

Isn't the fuel system in a 95 a return fuel system so the fuel pressure is the same all the time and the engien uses what it needes and returns the rest to the tank? If so then why do people use a fuel pressure gauge in a 95?

Injuneer

All stock LT1's are a "return" type fuel pressure control system. The LS1 system was revised to a dead-end, with recycle off the fuel filter.

But the rail pressure is not the "constant". Its the differential pressure between the rails and the intake manifold that is held constant, using the vacuum compensation connection on the fuel pressure regulator. Rail pressure, which is what you read off a fuel pressure gauge, will vary with intake manifold vacuum. It won't hold constant.

I think many of the people who are using fuel pressure gauges are running nitrous, or forced induction, and are simply trying to head off, or at least identify any possible problems with fuel pressure, and the resulting potential for detonation and piston destruction. I run one, but the fuel system is dual-pump, all -AN lines, modified rails running at 58psi, 78# injectors, and a Weldon outboard, non-vacuum compensated regulator. When I'm spraying a 300-shot (dry), I want to know the fuel is there.....