How much fuel can you flow thru a Holley 12-803 chrome reg @ 7psi in one min with 18 psi input pressure? Or whats the fastest time anyone has tested in seconds to fill a gallon?

Wont the line to the carbs be the restriction also?

Check out the old Pro-Stock cars and those regs looked like stock Holleys at least from the outside. I`ve seen em on real fast cars recently also..........Try it and post your results....

Years ago my friend and I tested this. The car had a BG 280 pump, and with the Holley reg it took 40 something sec. With the Holley Big Port reg it took 15ish IIRC. Unreal ! I would never use one of those little Holley regs again. Plenty of people go fast on them, but that don't mean its optimal.

i gota buddy runs very low 8,s with a holley big port reg,very inexpensive and basic.

From the testing we did, BG 280 @ 13.5v thru a Holley 12-803 reg set @ 7 psi it took 28 sec to flow 1 gal, Same set up but with BG reg set @ 7 psi took 19 sec to fill 1 gal, Tested the pump pressure @ 18 psi dead headed, The problem which is new from the last 2 runs is the truck is launching better, 1.39 & 1.35 from 1.65 ave but after the 60ft mark it falls on its face dropping from 6900 to 4500 then hunts up and down to 5500, This was with the Holley reg, We run .120 needles on either a bg 850 annular or a bg 1000 race demon and the annular was the 1.35 60ft, both carbs ran out of fuel @ the 60ft mark, I have swapped out regs to the BG but have no way to test till next week end @ the track , I am not sure if it is a G force problem or a reg volume problem from the difference in faster 60ft times, All opinions welcome, Thankx Craig

You running jet extensions in the rear ? And no rear power valve ? You knew somebody was going to ask .

you running a cut open hose from bowl vent to bowl vent? What you are describing is a rich stumble not lean.

No hose on the vent tubes, I will get on it the tubes are kinda short, That never crossed my mind, Thankx

We set the floats @ idle just past half way up the sight glass, Are you feeding that holley from both sides? If yes why?

No just the one side. Its cleaner to feed it from the drivers side, i hate short stumpy lines:

How steady should a fuel pressure gauge be? I have 7 psi @ idle and if I hold the rpm up high say 6k for 10 secs the pressure will drop to 5.5 and the primary fuel bowl will drop from a bit over half the sight glas to the bottom of the glass?

You should be able to maintain the bowl if the car is not under load.

It doesn't take much pedal to hit 6k no load, Dont know what the level drops to under load, I was supprised to see the level drop no load, is that normal?

no its not, sounds like you need a new pump

Mine doesn`t move but maybe a 1/4 lb if that from idle through 7000.........Magnafuel 300 pump and their 2-port reg. Before blameing the reg have you checked for restrictions before the pump? Pre-filter, bends etc.