Auto Parts: need help, displacement engine, volume pumps

Question
I have a big block ford that iv stroked and bored and so on it 521 ci i run a rpm set up with a 725 demon carb its jeted right but im having fuel problems when reving, i have 2 regs 1st reg is set 2 9psi 2ed reg is a rising rate reg that set at 3psi and i have no luck i run 3psi to the carb its fin a idel but with 1 rev i run out of fuel

wot can i do next ??

Answer
Hi Jono,

Is the float-level set correctly?

I'm not following the need for two regulators.

If you are using a carb on that huge displacement engine with an electric pump, pressure isn't your enemy, volume is. most aft-mrk carbs can handle up to about 8PSI, some more, some less. To feed your monster, you should have a low-pressure (between 2 and 6 PSI) and high volume pump. You should also have a flow-back line. High volume pumps almost always require a T-fitting with a return line back to the fuel cell so they do not create too much pressure which will damage the pump.

So I'd say that if your float-level is correct, your issue may be low-volume from your fuel pump.

Thanks for the question, I hope this information was helpful to you.
Fred
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