High Volume Fuel Pump Options
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Joined: Apr 2012
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From: Columbus, IN
High Volume Fuel Pump Options
I'm trying to make sense of some of the high volume fuel pump options out there.
The "stock" options are generally labeled as 40GPH. I presumed most were labeled in terms of free flow- is that the case?
The other recommendation is the Airtex 40736, which looks like it's near impossible to find. (Maybe better luck searching for it as a later Toronado stock replacement?) The RobbMc site seems to suggest the 40736 pump is 80GPH free flow, ~40GPH @ 4.5psi. It also looks like it might be too tall to clear the SBO A/C brackets.
The Carter M4871 seems to have different ratings depending on where you look- a "minimum" 40GPH flow rate per the Carter website, and a "maximum" 120GPH on places like Jegs or Summit. Even if that was free flow, that seems like an astronomical flow rate. But is it even a "performance" fuel pump, or a stock replacement?
The other option is the Top Street Performance high volume pump and its clones, which depending on where you look is rated for 80GPH at either free flow or 6psi. If that's free flow, it's basically on par with the 40736, but in a fancy billet package that might fit better (and unfortunately be a little more conspicuous.)
Does anyone know which numbers are true?
Of course the RobbMc pump is an option but more performance than I would need, and wouldn't clear my A/C bracket.
The "stock" options are generally labeled as 40GPH. I presumed most were labeled in terms of free flow- is that the case?
The other recommendation is the Airtex 40736, which looks like it's near impossible to find. (Maybe better luck searching for it as a later Toronado stock replacement?) The RobbMc site seems to suggest the 40736 pump is 80GPH free flow, ~40GPH @ 4.5psi. It also looks like it might be too tall to clear the SBO A/C brackets.
The Carter M4871 seems to have different ratings depending on where you look- a "minimum" 40GPH flow rate per the Carter website, and a "maximum" 120GPH on places like Jegs or Summit. Even if that was free flow, that seems like an astronomical flow rate. But is it even a "performance" fuel pump, or a stock replacement?
The other option is the Top Street Performance high volume pump and its clones, which depending on where you look is rated for 80GPH at either free flow or 6psi. If that's free flow, it's basically on par with the 40736, but in a fancy billet package that might fit better (and unfortunately be a little more conspicuous.)
Does anyone know which numbers are true?
Of course the RobbMc pump is an option but more performance than I would need, and wouldn't clear my A/C bracket.
Last edited by TheBigBlueBoat; Sep 13, 2023 at 06:30 PM.
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From: Columbus, IN
If I can make 450hp on motor I'll be pretty happy. Additional power from spray will be on a separate fuel system anyway.
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From: central Indiana
I have a friend with a 455 powered 66 cutlass using a Airtex 40736 pump. It runs 12.20s, with the Q-Jet.
I remember last year Joe, myself, and a couple others were discussing the fuel volume capabilities published. It appeared the pump arm
pivot was in the same location, so unless the internal valves are bigger the the only real difference is the canister size. Maybe that’s enough of a crutch for a less than ideal pump.
I remember last year Joe, myself, and a couple others were discussing the fuel volume capabilities published. It appeared the pump arm
pivot was in the same location, so unless the internal valves are bigger the the only real difference is the canister size. Maybe that’s enough of a crutch for a less than ideal pump.
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Joined: Dec 2006
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From: Melville, Saskatchewan
https://www.summitracing.com/parts/crt-m4516
Apparently the M45XX series produces 10 more gallons per hour than the M60XX series. The 3 line is in stock, two line special order. The billet may put out enough, give it a shot if not expensive. Try either but you may need either an electric or modify to fit the RobMc pump at your power level.
Apparently the M45XX series produces 10 more gallons per hour than the M60XX series. The 3 line is in stock, two line special order. The billet may put out enough, give it a shot if not expensive. Try either but you may need either an electric or modify to fit the RobMc pump at your power level.
Last edited by olds 307 and 403; Sep 16, 2023 at 05:20 AM.
Out of Line, Everytime😉
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From: Melville, Saskatchewan
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I ran out of fuel by the 1/8 mile with the Holley chrome mechanical pump. The Holley red pump has been good for about 15 years now. I run a Jeg's metal screen cartridge filter in line, and the pump is next to the tank on a bracket bolted to the trunk floor.
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From: Vancouver BC
Bernhard wrote:
The body broke on the Holley chrome pump we had, it never even made it two the track. In my opinion the factory original ACDelco pumps were better than the Holly chrome pump.
Last edited by Bernhard; Sep 18, 2023 at 06:39 PM.
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I’ve got a few customers still running very old Holley mechanical pumps. They’ve had to change out the main diaphragm because of the ethanol. But they work good for them.
at the track we’ve checked the pressure going through the traps and they are still putting out 5 psi. Fastest one is a low 12’s 455
they do tend to strip out the diaphragm bolt threads or crack the housing there if you have to remove the cover bolt more than once.
what I’ve done is epoxy a stud in the housing , then use washer and nut. That Top Street performance one looks like a remake of the Holley?
at the track we’ve checked the pressure going through the traps and they are still putting out 5 psi. Fastest one is a low 12’s 455
they do tend to strip out the diaphragm bolt threads or crack the housing there if you have to remove the cover bolt more than once.
what I’ve done is epoxy a stud in the housing , then use washer and nut. That Top Street performance one looks like a remake of the Holley?
Last edited by CANADIANOLDS; Sep 22, 2023 at 01:58 PM.
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From: Vancouver BC
Registered User
Joined: Jul 2012
Posts: 2,991
From: Vancouver BC
I’ve got a few customers still running very old Holley mechanical pumps. They’ve had to change out the main diaphragm because of the ethanol. But they work good for them.
at the track we’ve checked the pressure going through the traps and they are still putting out 5 psi. Fastest one is a low 12’s 455
they do tend to strip out the diaphragm bolt threads or crack the housing there if you have to remove the cover bolt more than once.
what I’ve done is epoxy a stud in the housing , then use washer and nut. That Top Street performance one looks like a remake of the Holley?
at the track we’ve checked the pressure going through the traps and they are still putting out 5 psi. Fastest one is a low 12’s 455
they do tend to strip out the diaphragm bolt threads or crack the housing there if you have to remove the cover bolt more than once.
what I’ve done is epoxy a stud in the housing , then use washer and nut. That Top Street performance one looks like a remake of the Holley?
Was the low 12's 455 running a Qjet or other?
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