10K/14K mod??
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Elder User
Joined: Oct 2008
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10K/14K mod??
I have read about the 10K resistor mod being done on diesels, but can it be done on gas trucks as well? Where exactly does the resistor get put in? I understand that it increases injector pressure. Is there a downside to this in a gas truck?
Post Fiend
Joined: May 2006
Posts: 10,007
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From: Central Florida
I believe our fuel rails pressure is vacuum manipulated and not electronically as we have a return fuel system. The 05+ may have gone to returnless, but I believe it would be easier to modify the returnless fuel pressure via pcm than wiring.
On the drivers side of the fuel rail is a silver bulb with a vacuum hose leading off it. This allows excess fuel to return to the tank. As vacuum drops, a diaphragm gets shifted and changes the resistance on the valve/seat. There are probably adjustable regulators available, but you will most likely have to saw your reg in half and clamp on the new adjustable top housing. Conversely, you can change out the rails and use an adjustable EFI regulator.
On the drivers side of the fuel rail is a silver bulb with a vacuum hose leading off it. This allows excess fuel to return to the tank. As vacuum drops, a diaphragm gets shifted and changes the resistance on the valve/seat. There are probably adjustable regulators available, but you will most likely have to saw your reg in half and clamp on the new adjustable top housing. Conversely, you can change out the rails and use an adjustable EFI regulator.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
The mustangs will have a returnless fuel system at some model change, I think it was 2003 with the 3v motor. In a returnless fuel system, the fuel pump does not pump constantly like our return system. It pumps until the desired fuel pressure is reached and then pumps only to maintain that pressure. I suppose changing the signal from the fuel pressure sensor would cause the fuel pump to cycle longer, however, the same thing can be tweaked in the PCM.
I don't know about the 150s, I guess they could have gone to a returnless style with the 3v motor too. Our 2v motors use a return style fuel system and has a mechanical regulator.
I don't know about the 150s, I guess they could have gone to a returnless style with the 3v motor too. Our 2v motors use a return style fuel system and has a mechanical regulator.
Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
100% totally different fuel injection system. The 10K mod doesn't do a thing to fuel pressure on the Powerstrokes. Instead is bumps up oil pressure. Powerstrokes (except for 08+) use HEUI fuel injection (hydraulic electric unit injection), meaning they use high oil pressure to actuate the injectors. Your 5.4L doesn't use oil pressure to fire the injectors.
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96ford4x4turbodiesel
1999 - 2003 7.3L Power Stroke Diesel
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Nov 6, 2004 01:54 PM
