What size Fuel Pump???
#2739984
02/05/20 02:06 PM
02/05/20 02:06 PM
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Joined: Nov 2003
Posts: 2,936 GA
roadrunninMark
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OP
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Joined: Nov 2003
Posts: 2,936
GA
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I am looking to build my fuel system and am not sure on the size of the fuel pump. Here is the background of the engine: 526CI BB , E85 fuel, say at least 12-1 CR, solid roller, indy alum heads (at least 700HP), FItech 1200HP power adder fuel injection system, fuel cell with in-tank pump (probably Holley 12-146).
I've sent a message to FITech to ask them but have not heard back so far. I was looking at the holley 12-146 setup that goes right into the fuel cell and has a 118 GPH @ 87 PSI. Seems like a lot of fuel? Is it too much? The smaller one is 67 GPH @ 80 PSI. I realize using E85 I need more fuel, but I don't want to overdo it (or underdo it either). I want to use the in cell pump setup, not an external pump.
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Re: What size Fuel Pump???
[Re: MR_P_BODY]
#2740014
02/05/20 03:32 PM
02/05/20 03:32 PM
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Joined: May 2019
Posts: 702 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 702
Lake Villa Il
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I think you would want at least the 450 pump, I wouldn't try anything smaller.
Might be close on E85 depending on how far over 700hp you end up making.
What fuel pressure does the Fitech run at? 43psi would get you more out of the pump than 58psi for example.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: What size Fuel Pump???
[Re: roadrunninMark]
#2740313
02/06/20 01:04 PM
02/06/20 01:04 PM
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Joined: Mar 2007
Posts: 3,275 West Coast, USA
jbc426
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I'm running an externally mounted Fuelabs in-line pump fed through a pair of Holley Hydra Mats. It's a two speed pump with the higher speed being triggered via a micro switch on the throttle linkage that triggers when the outboard carbs are opened. They have some really nice pumps and most have a two year warranty. Mine is super quiet on the low speed circuit, and fuel pressure remains constant at both low and high speed. I do run a return style system. Worth a look if you are shopping for quality fuel pumps. https://fuelab.com/Also, these guys were very knowledgeable and helpful in getting my fuel system properly set-up and sorted out. They also have various sizes of fully submersible fuel line. https://www.harmonracingcells.com/
Last edited by jbc426; 02/06/20 01:10 PM.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: What size Fuel Pump???
[Re: roadrunninMark]
#2740391
02/06/20 04:03 PM
02/06/20 04:03 PM
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Joined: Aug 2003
Posts: 43,007 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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I had to learn the hard way that it is usually cheaper to buy the better part built for future growth than it is to buy the same type part twice due to adding more HP later, IE fuel pumps, headers, ignitions and so on Buy the biggest one now, not later You know power is addicting and who knows if and when you will go to straight methanol and add a blower or turbo later
Last edited by Cab_Burge; 02/06/20 04:04 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What size Fuel Pump???
[Re: roadrunninMark]
#2740485
02/06/20 08:22 PM
02/06/20 08:22 PM
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Joined: May 2019
Posts: 702 Lake Villa Il
INTMD8
super stock
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super stock
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Lake Villa Il
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FI Tech is compatible with E85, I asked them that prior to purchase. They said deduct 30% of the advertised HP level for that injection unit and that is the power it will run on E85. So that should put me at max 840 HP on the injection system.
Andy - thanks for the math! So the smaller pump should be fine as I believe the injection system doesn't need that high of a PSI. I will double check with everything will be OK with the E85. I did read that I will need to remove the foam from the cell as the E85 will eat it. I am not sure if they have compatible foam now or not.
**Just read that the big pump is compatible with E85, the small is not **
I remember the PSI requirement being around 51PSI, I am trying to find the number.... The smaller pump wouldn't have made it anyway. Ratings are one thing but there are also system losses (lines/fittings/voltage level). Having tuned cars on gasoline and e85 with both pumps (fuel injection) a 255lph pump keeps up to around 650 crank hp on gasoline. Would not even be close on E85.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: What size Fuel Pump???
[Re: jbc426]
#2740491
02/06/20 08:33 PM
02/06/20 08:33 PM
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Joined: Feb 2005
Posts: 20,116 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,116
PA.
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I'm running an externally mounted Fuelabs in-line pump fed through a pair of Holley Hydra Mats. It's a two speed pump with the higher speed being triggered via a micro switch on the throttle linkage that triggers when the outboard carbs are opened. They have some really nice pumps and most have a two year warranty. Mine is super quiet on the low speed circuit, and fuel pressure remains constant at both low and high speed. I do run a return style system. Worth a look if you are shopping for quality fuel pumps. https://fuelab.com/Also, these guys were very knowledgeable and helpful in getting my fuel system properly set-up and sorted out. They also have various sizes of fully submersible fuel line. https://www.harmonracingcells.com/ Lol. That looks like the plumbing under my sink in my motorhome. I hope that isn’t your fuel system
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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