The vent is to adjust the pressure to the atmospheric pressure. It should be about 60 psig. I used the VENT to feed in boost pressure to see if I could prevent high boost leaning. BOY DID THAT RICHEN THE FUEL CURVE> I now use that port with a regulator to add one psi boost to the fuel curve when my engine goes over 10 psig. at 15 psig boost my rail is now at 65 psi. This change prevented my leaning at high boost numbers, and Rob incorperated it into a kit for boost modulation of the rail pressure.

Single feed rail is fine with me as the pressure is more than equal front to back, only one injector is taking a few cc's of fuel per pulse at a time. Probably less than a cc typically, by a long shot.

Enjoy, Woody

I did have 80 psi at the rail at 20 psig boost for a test and was BELOW 9:1 air to fuel ratio - Woof