fuel pressure

what is the correct fuel pressure on the solex borez carbs 40 mm bodies old solexes on 356 we would set at 3 to 3.1/2 with electric pump low pressure no regulator needed now have new 1915 with regulator it came set at 1/2 pound only this sounds to low to me on most of these regulators if the pressure goes up the volume goes down. bill

thatisonerunonsentanceman,Ihadtoreadittwicetofigureoutwhatyouwereasking.

2.5 - 3.5 PSI are the limits for carbs. Fuel injection is a toally differnet matter. Fuel Pressure Regualtors (FPRs) are not really needed on carbed engines. You can run them, but they don't really do anything.

Another factor is the type / brand of fuel pump. the square ones (Facet) are not very high in quality. do some research before you buy / use one.

It is not a bad idea to have a fuel pressure gauge in your carb gas line hook up. Using a electric pump calls for at least verification of the pressure once....using a mechanical pump is even more risky as their pressure can be dependent upon shimming the height of the pump, something that is seldom done anymore by other than old time VW motor heads. I have seen pressure as low as 1/2 pound and as much as 7#'s in cars that were "running fine". They ran even "finer" when the pressure was adjusted to what the carb set up requires. It is my understanding that Kadrons for example run properly on 1.5-2.0 psi (I don't know that for certain, if you need to know, check with Mr. Kadron) I have seen nice improvements in driveablilty when the pressure is set "right". Right is generally about 3.5#'s max for most set ups.