Thread: How much fuel for 402 + 6-71 blower?

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My wife and I were given her dads 28 Ford Hi-boy roadster and we have been having a ton of fun with it. It does need some work and we've been doing a little here and there when we can.

I was told by someone at a speed shop that I might want to upgrade the fueling capacity and I've been trying to research that now.

Currently we have the links to the secondaries disabled, so only the primaries are working right now. Everything works pretty good far as I know, starts ok, runs good, little trouble idling but once it's hot it's pretty good. So I don't know that I have a problem per se... but i want to reconnect the secondaries this spring and see what it'll really do.

So what I have now is a Holley Red fuel pump, one regulator by the fuel pump set to 5psi feeding 2 holley 600CFM double pumper carbs. Is this enough or do I need to think about more fuel. I was recomended a Aeromotive A2000 pump 2 regulators and whatnot, I'm just not sure I really need it.

The BEST that you can do is to supply a certain pressure and volume to the carb inlets at ALL times. That's the best. Five PSIG sounds about right.

Given that, if you put a gauge at the carb inlet (downstream of the regulator) and were to watch it throughout the entire engine operation range/loads you would know if the pressure was consistently correct. If the pressure falls (say at wide open throttle), you would know that you need more fuel supplied and that some element of the system isnt keeping up. Maybe it's the fuel line size, the filter restriction, bends, kinks, etc.

It is interesting that the regulator is near the pump.....the regulator is usually nearest the carbs so that the lines see higher pressure.

mike in tucson

Ok so it sounds like the best thing I need to do is just hook up the secondaries and watch the fuel pressure when going full throttle. If it doesn't hold the set fuel pressure then worry about upgrading.

Thanks!

By the way, you should be able to buy a fuel inlet fitting with a gauge port to simplify the installation. Look at Summit or Jeg's for gauges, etc.

mike in tucson