In tank fuel pump meets Carb

[lo72]

Im gettin ready to put my engine in my 85 and my block doesn't have a mechanical fuel boss. I really need some input on using the In tank style with a 3 port regulator (inlet, outlet and a return) -6 inlet, -6 outlet and a -8 return to the tank I'll run the pump on a relay with a low oil pressure cut off. Engine is a 30 over 454 zz502 cam 750 Holley carb and big block Chevelle headers. I would like any input or ideas. All of you fuel injection gurus jump in and help me out. Thanks Greg
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[gchemist]

What is the fuel pressure rating of the pump? Based on pressure, you may need some hight pressure hose connections. What type of carb? Most need less than 5-7 PSI.

[lo72]

Factory RBI pump somewhere between 40 to 50 psi I think. It's a Holley 750. Yeah about 5 to 7 psi is the rating. Yeah I was gonna run high pressure from the tank to the regulator
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[80SPORT]

You would be better off to just run the AC Delco electric inline pump in place of the mechanical pump.
P/N 6472657 ....about $70.00 at your friendly GM store

[bustedknuckles]

The problem with most factory electric pumps is volume. Just because it makes 40 psi doen't mean it will support a healthy bbc. Might want to check on that.

[gchemist]

I agree. A inline pump would be better. There are a few that provide low PSI. Look at 87 TBI fuel pumps. You can buy all the stuff from LMC. All you need is a regulator to step down from 15 PSI to 7 PSI.

[lo72]

Thanks guys for the input. Is the 87 tbi pump in line or in tank. I'll check LMC. Thanks again. Greg
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[rs72z]

The tbi pump is in the tank and i think they only put out about 17 psi, not 100 percent on that though.

[lo72]

Would I need to run a return line with a TBI pump? If I regulate it at 7psi that's about a 50% step down
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[rs72z]

Yes.
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[lo72]

Thanks Greg
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[wyattglock]

If you ran the in tank tbi pump and a good aftermarket bypass style regulator, such as the Aeromotive 13301, you would get the pressure you need at the carb. It will also give you the capability of a return line. They regulate fuel pressure from 3-65 psi depending on which spring you install.