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Mechanical Fuel pump output

Moderator: Mod Squad

sandboxer
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Mechanical Fuel pump output

Post #1 by sandboxer » Mon Jul 15, 2019 9:44 am

Does anyone know how much hp the stock mechanical fuel pump can support?
Thanks

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xctasy
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Re: Mechanical Fuel pump output

Post #2 by xctasy » Mon Jul 15, 2019 11:17 am

Use the advanced search. Punch in request, and use my name xctasy. I'm like the Friday night freek who does the stupid moves on the dance floor, so everyone after feels ok. And I'm stupid enough to ask all these questions and get ticked off when someone white washes a question. Actual, real answers are in the FoMoCo manuals, and if people really want to help, they should reference where and when the info was produced.

The Small and Big Six fuel pumps were essentially the same, but placement varied, and the Big Block Chevy and AMC Six in line and V8's shared a similar base design, so its real easy to punch the peak flow rate up well over 4 times, which is great as there are some real 400 hp small sixes out there without electric pumps.

According to the early Big Six details, free Flow Rate should exceed the equivalant of 29 US Gals PH/109 liters PH and Maximum Pressure (psi) should exceed 7 psi at that delivery rate. They leak into the sump when the seals break, so check it first. 60, 80, 120 GPH versions can be made with ease.

The aftermarket make ones that can fit if you modify the arm. Pump stroke through poor pump placement on the gasket causes a potential delvery issue. Fords I6 era pumps had Eccentric total lift of 0.290-0.310 inches, Stroke off the cam should be that much. The same kind of pump on a Chevy or AMC recieves a 0.337 " stroke from the pushrod.

see viewtopic.php?f=1&t=76476&p=588678&hilit=fuel+pump+flow+rate#p588678
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

sandboxer
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Re: Mechanical Fuel pump output

Post #3 by sandboxer » Mon Jul 15, 2019 11:47 am

Thank you xcstasy for the epic answer and thread, which I’ve bookmarked. It’s always humbling when the experts on the forum chime in.
Cheers

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xctasy
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Re: Mechanical Fuel pump output

Post #4 by xctasy » Mon Jul 15, 2019 12:10 pm

I've been burnt by two modern 4wd EFi vehicles which were simply superb in every catagory. Fuel delivery which doesn't prime on reverse up ramps, or hardshoulder crossfalls are epeic fails for me. So except for being able to deliver fuel at critical times, the 1996 Nissan Stagea and 1998 Ford Explorer were unsatifactory as a road inspection vehicle.

IMHO, Anything SUV or pickup must have a much better than stock 1986 to date fuel delivery system. Its a non negotiable for me.

hasa68mustang
&
kirkallen143

They had notes on the 120 gph Carter M4891 Super Strip pump for 350 Chevs.

It's a little X'y regards dollar purchase but its a well in excess of 9 pound pressure head pump that will need a Carter fuel regulator that regulates the pressure, not the flow, but it sure works. :nod:

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Like this https://fordsix.com/ci/FuelPump.html

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It can be boost referenced for a turbo to about 9 psi if the drilled section is opened out.

If you have to go electric or big flow mechanical, then you have to fuel regulate.

For regulating it, follow the big flow low pressure rule Does10's taught us.

On a carb instillation, you need a return line to lower the pressure, not regulate the flow. If you have an EFI style Mallory 250 fuel pump, you'd run a fuel return as big as your fuel supply line to your carb. If its less than the gallons per hour specs on a Mallory 250, you'd then look at the a line smaller, the same as the vapour line from the tank. It would have to be steel or rated rubber, and deposit fuel below the fuel filler, preferably the way it does on a factory instillation.


In a full accelleration launch, return line fuel has to go into the tank, and in an accident, there should be a inertial cut out, and an oil pressure cut out to any electric pump.


Mallory MAA-4309 3 PSI to 12 PSI return style regulator.

Snap!

Image
Last edited by xctasy on Tue Jul 30, 2019 12:17 pm, edited 1 time in total.
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

BigBlue94
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Re: Mechanical Fuel pump output

Post #5 by BigBlue94 » Mon Jul 15, 2019 2:48 pm

I believe the 28 or 29 GPH is factory. I'm running a Carter 35 GPH mechanical pump, through an aeromotive returnless FPR set at 6.5 psi. Have more than enough fuel for my 250ish HP 300. My pump is the one with the canister facing upwards.

From the summit racing specs, my pump is for all the falcon 6 and BB6 blocks as well as 390 FE(?) Might be worth some further investigation.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

sandboxer
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Re: Mechanical Fuel pump output

Post #6 by sandboxer » Tue Jul 16, 2019 12:40 am

BigBlue94 wrote:I believe the 28 or 29 GPH is factory. I'm running a Carter 35 GPH mechanical pump, through an aeromotive returnless FPR set at 6.5 psi. Have more than enough fuel for my 250ish HP 300. My pump is the one with the canister facing upwards.

From the summit racing specs, my pump is for all the falcon 6 and BB6 blocks as well as 390 FE(?) Might be worth some further investigation.

I’ll look into it.
Many thanks!

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