Re: EFI fuel pump considerations
[Re: NFURY8]
#119506
09/12/08 08:19 AM
09/12/08 08:19 AM
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Joined: Feb 2003
Posts: 4,204 Fort Worth, TX
Clair_Davis
master
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master
Joined: Feb 2003
Posts: 4,204
Fort Worth, TX
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I'd give Auto Performance Engineering a call and see how they'd handle some of those issues. I think a Walbro in-tank pump could do the trick for you, as long as you could sort out the pressure regulation. At some point, Magnums went to in-tank regulation rather than a regulator on the rail, so you COULD handle regulation back by the tank somewhere and just run the single line up to the fuel rail. A tidy spot to run a return line is to the filler tube, but I'm guessing that's entirely inside the truck cab as well. Maybe you could fab up some sort of auxiliary fuel tank that houses the pump and return line separate from the main tank. Should be plenty of room under that monster... Clair
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Re: EFI fuel pump considerations
[Re: dogdays]
#119509
09/12/08 03:54 PM
09/12/08 03:54 PM
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Joined: Jun 2003
Posts: 746 Missouri
NFURY8
OP
super street
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OP
super street
Joined: Jun 2003
Posts: 746
Missouri
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Clair, actually I started down that road already. My Magnum is a 94, which was the first year for the tank mounted regulator. I took a apart a 94 pump unit and pulled out just the pump. It easily fits into the sending unit hole. I cut 6 inches of the pickup off and used a piece of fuel injection hose and some fuel injection hose clamps to attach the pump to the pick up.
I even pulled off the connection for the wiring to feed the extra wires into the tank. The problem then was the regulator. The regulator isn't actually in the tank, it is on top of the unit. It connects with a rubber grommet in a 1-5/8" hole. The problem is that the regulator is also a filter and the filter part is about 2-1/2" in diameter and sticks up about 2". There isn't room between the tank and the cab to fit this. I am afraid the regulator might make contact with the cab and come loose.
I have also been second thinking the idea of having pressurized fuel in the cab. This is a Crew Cab, so that means the fuel connections are just behind the seat from where my kids will be. If there was a leak...
Here is another thought. The Ram had the regulator on top of the tank, so it maintained the a single line pressure over a nearly 8 foot line. My line will be about 9'-10'. Why couldn't I mount an external regulator on the frame rail, just few feet from the pump? Then the return fuel wouldn't be heated by the engine, right? Or is the fuel pump a bigger source of heat than the engine bay?
Dogdays, not quite sure I follow you. Are you describing the typical plumbing, with the regulator right at the intake, and 2 full length lines from the motor to the tank? I understand this is the typically recomended method and obviously does have advantages. But my goal is to have only one line and no regulator under the hood. Mostly because I don't want to rework that part with the new fuel cell.
I am open to any suggestions also!
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Re: EFI fuel pump considerations
[Re: NFURY8]
#119510
09/12/08 04:00 PM
09/12/08 04:00 PM
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Joined: Nov 2004
Posts: 182 Columbia, Missouri
dtedler
member
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member
Joined: Nov 2004
Posts: 182
Columbia, Missouri
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Hey great to see you on here. Go to www.pro-touring.com and ask the question. There are a ton of very knowledgable guys over there that specialize in fuel injection. If any of your get the opportunity to see this mans car...it's flat out cool! Tony Columbia, Missouri
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Re: EFI fuel pump considerations
[Re: NFURY8]
#119511
09/12/08 09:49 PM
09/12/08 09:49 PM
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Joined: Feb 2003
Posts: 4,204 Fort Worth, TX
Clair_Davis
master
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master
Joined: Feb 2003
Posts: 4,204
Fort Worth, TX
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No reason you can't have the regulator just about anywhere you want... as you know, the Maggies run just the one line up to the rail, with little if any ill effects. What I don't know is whether or not the Maggie returnless system has a vacuum reference to the regulator, or if it just runs a straight pressure to the rail and adjusts for the flow across the injectors through the fuel calibration. If you're running OEM electronics, make sure you're running OEM specs on the fuel delivery (obviously). I thought Maggies ran higher pressures, but I can't swear about the early ones. My system uses a return line, but it's separate from the rail: Hard to see because all the crap being out of place, but you can see the regulator on the far side and the fuel line wrapping around to the rail. So, it's like a mix of the returnless and return style systems. Seems to work OK for now. Clair
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