Ok i was in the right spot then..lol..i'm gonna do a blow through set up.. and would rather an electric fuel pump anyway..i'l keep lookin...thanks for your help
I think it's a question of how much HP you are going to be making.
A mildly boosted, nearly stock engine might make, say, 200 horsepower and wouldn't need much more fuel than a stock system would deliver, so, up to 5-8- pounds of boost could probably be handled by a stock fuel pump with just a boost reference line from the carb hat to the back side of the diaphragm on a good mechanical pump (maybe a hi-po M-P aftermarket unit.)
But, if you're going after horsepower on a grander scale, say, 15-20 pounds of boost or more, with horsepower in the 300-up range, you're probably going to need a whole new fuel system that would include a 3/8" tank pickup, an electric pump that can deliver 30 pounds of pressure (or, more,) new 3/8" fuel lines, a carb with blow-thru mods (or some sort of EFI) and a boost-referenced fuel pressure regulator to cut the pressure back to 6.5 pounds (on top of whatever boost may be present, at the time.)
You don't EVER want the engine (float bowls) to be starved for fuel under any circumstances, as this will create engine-killing detonation, and mechanical carnage wll result, in all probability. Almost guaranteed...
I supercharged my 360 Magnum-powered '72 Valiant and spent inordinately, on my fuel system, but it was the best money I ever spent.
I used 1/2"-dameter, "push-on" hose, and added a fuel cell to the trunk. I plumbed it so I could use the pump gas in the original tank to drive on the street, and once at the strip, turn some valves and run off the racing gas ($$$$$) in the fuel cell for high boost action, and once the racing was over, switch back to the other tank (pump gas) for the drive home.
I installed 2 completely separate, autonomous, fuel line systems so that I could utilize either the tank, or the fuel cell, and either pump (one Holley Blue pump for the street, or an expensive, high pressure/high volume "racing" pump, just by changing the fuel routing by flipping two electrical switches and turning a couple of valves in the system. Both systems go through the same (two) fuel filters.
That way, if one pump "gives up" (and, this has happened) I can switch over to the other system for a backup, and am not stranded.
I am not at all advocating this system for anyone else, it's just what ~I~ did. Your mileage may vary.... 8)
Here are some pics...
