Lots of good stuff here! Thanks everyone for the replies! The fuel pump is a Firecore and I can't remember the output on it. I have a Holley filter before the pump and the pump feeds a 1/2" aluminum line up to the Holley regulator. From there I have two #6 lines feeding an 1150 dominator. The engine is a 512 RB with Victor heads and a roller cam. The best 60' was 1.385 or 1.375. It usually is around 1.40-1.41. One thing I do not have on it is a relay for the pump. I will address that in the future.

If you can , put the regulator in front of the carb, G forces would not effect the pressure.

It is on the passenger side inner fender. Can't move it.

X2 Thanks Thumper

Hey Boomer, you really need a rely so it takes the load instead of your signal 12v wire and I run two 30 amp relays tied together per Magnafuels directions and my pump gets full voltage and screams.........literally lol!

The fuel PUMP is only a small part of the fuel SYSTEM. The biggest baddest pump in the world won't work if the system doesn't. It all has to work together. Bigger lines, hold more volume and the column of fuel is harder to move in a G situation, so you need more pump. Smaller lines help that, but won't supply the volume. More pressure is NOT the answer. Pressure just aerates the fuel, which is NOT a good thing. Your fuel system should supply the volume of fuel you need and not need more than 5 psi at the carb to do it. If 5psi of regulated pressure at the carb, does not supply enough fuel...........you need more volume

I agree w/MOST of what you`re saying Monte but low pressures like the 5psi you mentioned need to have the bigger n&s`s to function properly and a .110 ain`t gettin it like the ones I recently pulled out of a 1050 Dominator that was jacked up. Voltage is a HUGE factor and I crack up when guy`s run a 12 v system w/out an alternator.......

Thanks for the reply Monte! The old rule of thumb used to be 6 1/2#. I know a guy who wrote an article for an on line magazine that turned down the pressure to 5 1/2# and the car picked up. Can you explain that? And Thumpman...Why two relays? I also have an alternator. Learned that lesson the hard way!

I assume the two relays carry the load better than one but not 100% sure on that you`ll have to ask Magnafuel. The low pressure/big n&s`s are more consistent and aerate less keeping the bowls full of fuel instead of fuel and bubbles and w/a .130 probably less stress on the pump. Been running 5 1/2 psi for a while now w/a .130 n&s and may even go down to 5 to see what happens since I have a gauge on my cowl, it`s easy to view.

My gauge is also on the cowel. I don't know what is in the 1150. I presume it is stock n&s.

Get you some viton .130`s and lower the pressure to 5 1/2 and see what happens but then you still have the "shelf" the fuel has to fight/overcome to get to the n&s`s.......

Makes sense, because over time I'm sure the contacts in the relays get pitted and maybe even heat up causing even more resistance.

If nothing else, it would be nice to know that if one relay failed the other would keep things going.

FWIW, I run a Magnafuel 300 pump with a return line it started leaking, had to go to my back up aeromotive ss dead head pump. Saw zero difference in performance. I run 2 eddy 750cfm carbs psi set at just less than 6psi.
car runs 10.30's. just info

Apparently both pumps are enuff for your combo......call Magnafuel and get a re-seal kit or send it in and they`ll install the seals(or whatever else it needs)for the price of the parts and shipping back to you.......No labor charge.

Did that and got it back, $51 new seals and bearings plus shipping. Great service and price !

Good deal and I`m takin my junk to a semi-local 1/8 th mile track here soon to either kick out the rear gears or run a 6.teen........

Really?
Let me try an analogy, numbers here are arbitrary, you have a 12' tall cylinder water cistern, say its 1/2" in diameter, you measure the water pressure at the bottom, on earth at 1g,, your neighbor also has a 12' high cistern next door, its 12" in diameter, what pressure does his measure at the bottom? You both move to Saturn with your cisterns, gravity is now 4g's, what is the difference in water pressure now between you and your neighbor?

The point is, line diameter has little effect as long as pump can provide needed pressure, and flow for the needed tube diameter, or run a 3" or bigger line, it will not hurt.

We are not dealing with water cisterns..............we are dealing with moving a column of fuel in a large line, while fighting Gs. Now while I admit I don't know a damn thing about water cisterns, I do know a little about fuel systems

Well then for everybody else, here's another related analogy, say you had a tube the size of a golf ball, tube is any length you want, and its completely filled with golf balls, if you had a golf ball pump that inserted one golf ball in one end, want to ponder how many golf balls would come out the other end, discounting any inertia? Now imagine if the same length tube was much greater in diameter then the diameter of a golf ball and again filled with golf balls, and your pump again inserted one golf ball in one end, know how many golf balls will exit the other end?

I think the confusion here is the weight of the liquid column increases with increasing diameter, but the pump in reality is only acting on a Lbs per inch basis, not the entire column, no matter what its size or weight.

I need to go fill my cistern with golf balls.

Pascal's law...