Re: Fuel cell EFI fuel pump
[Re: EV2DEMON]
#2435065
01/15/18 04:32 PM
01/15/18 04:32 PM
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Joined: Jan 2003
Posts: 31,022 Oregon
AndyF
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I guess I never noticed before, but it appears Holley just relabels Walbro pumps?
For an EFI car, wouldn't a return still be necessary with the regulator after the fuel rails?
Yes a return is required but it doesn't have to be a full length return from the front of the car. I'm putting the regulator in the trunk on my Duster so I'll only have one high pressure line going to the front of the car.
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Re: Fuel cell EFI fuel pump
[Re: AndyF]
#2435080
01/15/18 05:06 PM
01/15/18 05:06 PM
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Posts: 31,022 Oregon
AndyF
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I'm using the Holley 12-876 regulator/filter which is designed to be mounted next to the fuel cell. So if you have the pump in the fuel cell and then the 12-876 next to the fuel cell you would only need a short return line and the a high pressure line. Up front I'm going to put the fuel pressure sensor at the end of the rail so the ECU knows what the pressure is at the end of the line. That way everything is controlled by the pressure at the end of the rail. https://www.holley.com/products/fuel_sys...rs/parts/12-876
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Re: Fuel cell EFI fuel pump
[Re: AndyF]
#2435118
01/15/18 06:26 PM
01/15/18 06:26 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Not using a regulator at the rail is fairly common on newer cars. Ford uses pwm pump control to maintain pressure, and save wear and tear on the fuel pump. No regulator with this style system. The problem using a mechanical regulator in the rear, is you lose some dynamic fuel control. Manifold referenced regulators cut back fuel pressure at low load, and increase fuel pressure at high load. This allows a tad bit wider pulsewidth at idle, while delivering less fuel, which can be helpful if you have large injectors. It also gives more fuel at higher loads with lower pulsewidths. Unless you plan on pwm pump control, the fuel pressure sensor really is nothing more than a logging benefit. It will have no effect on fuel control. I may not be interpreting what you are doing correctly.
"use it 'till it breaks, replace as needed"
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Re: Fuel cell EFI fuel pump
[Re: AndyF]
#2435122
01/15/18 06:36 PM
01/15/18 06:36 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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Great to see this. I was thinking of trying the FiTech EFI 1200 on the Chargers 500" stroker engine. Not sure 12" depth will work with my 20-gallon fuel cell?
Last edited by 451Mopar; 01/15/18 06:42 PM.
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Re: Fuel cell EFI fuel pump
[Re: AndyF]
#2435602
01/16/18 01:28 PM
01/16/18 01:28 PM
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Joined: Mar 2007
Posts: 3,277 West Coast, USA
jbc426
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That's a nice alternative to running a second line to the front of the car. I love all the EFI upgrade stuff your making for our old Mopars, Andy! Some day I'll switch.
Single line to the front of the car using Pulse Width Modulation is the current state of the art. Do the Holly or Fast EFI computers support it? It helps keep the fuel pump cooler and allows it to last longer.
The Cadillac CTS-V pumps with secondary remote pick-ups(with snowmobile pick-ups) are larger, have a small build in sump, flow more fuel and drop in from the top of the tank like the Holley unit you showed.
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: Fuel cell EFI fuel pump
[Re: Mopar_Rich]
#2435804
01/16/18 06:07 PM
01/16/18 06:07 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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I'm not a fan of deadheaded fuel systems. I have seen several issues. Hard to get the vacuum line to the regulator, if air gets into the line it causes a pulse and doesn't clear for a while, Fuel sitting in the line is subject to heat soak at low engine rpms which is the worst on a hot day sitting at a light.
Also, the best fuel pump PWM systems respond to fuel demand not just TPS position.
I agree with all of this. The downsides of the limited “extra” plumbing are not worth the small benefit of a shorter return line. My post was hinting at the fact that if you are using a non referenced return system, go all out and use the pwm set up. This still doesn’t negate the very real other problems stated.
"use it 'till it breaks, replace as needed"
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