modifying the stock fuel pump
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From: shawnee KS
modifying the stock fuel pump
Have heard the the stock pump is capable of higher fuel pressure. Can this be done without buying a lot of extra parts? Truck has bigger injectors, air cleaner, and exhaust. Thought the bump in pressure would help. Truck runs hard up to just before shift then kinda loses some power. When it shifts, the lower rpms, all the power is back. Seems to starve for fuel the split second before the shift.
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From: Las Vega$
what truck are you talking about ? what year ? what motor ? what mods ?
are you running a programmer ?
you know they do defuel a little bit during a shift, they dont shift under full power usually.
are you running a programmer ?
you know they do defuel a little bit during a shift, they dont shift under full power usually.
Post Fiend
Joined: Oct 2005
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From: Plano TX and Brentwood TN
Originally Posted by LvTitan
what truck are you talking about ? what year ? what motor ? what mods ?
are you running a programmer ?
you know they do defuel a little bit during a shift, they dont shift under full power usually.
are you running a programmer ?
you know they do defuel a little bit during a shift, they dont shift under full power usually.
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From: Las Vega$
the 6.0 has a fuel regulator. i have a fass, so that's covered.
but i can tell you that even with stock injectors the ultra comp file will tax the stock fuel system to the limit.
in his sig he states numerous trucks, but none of them were a 6.o, that is why i was asking.
but i can tell you that even with stock injectors the ultra comp file will tax the stock fuel system to the limit.
in his sig he states numerous trucks, but none of them were a 6.o, that is why i was asking.
Hotshot
Joined: Dec 2003
Posts: 15,368
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From: Stuttgart, Ar
The stock fuel pressure can be raised by shimming the regulator spring with a .177 diameter BB. Bobcat has a steel ball part# 6592105 that is .187 and will give you about 60-65 lbs of pressure. Problem is not pressure it's flow. With a hot tune on stock injectors you can drop your fuel pressure to 20# easily even with a shimmed regulator OR a regulated return system. 40# is really the minimum you want to go without hurting your sticks. With bigger injectors you are killing them with a stock pump, plain and simple.
One other thought. Some programmers defuel on shifting depending on what kind. It's a crappy way to control the tranny.
One other thought. Some programmers defuel on shifting depending on what kind. It's a crappy way to control the tranny.
Last edited by npccpartsman; Oct 16, 2007 at 07:19 PM.
Post Fiend
Joined: Oct 2005
Posts: 10,626
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From: Plano TX and Brentwood TN
Well that's true, but it doesn't do a very good job with the dead-heading that goes on. No his siggy doesn't state any 6.0, and I was just assuming as I would think it would be pretty pointless to post in a 6.0 forum and be talking about any other engine, but it is an assumption on my part.
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From: shawnee KS
I am sorry- it is an 05, it is a 6.0 and the mods are listed. I did however forget to ask about the programmer, my bad.
npccpartsman- Thank you, I believe that was the answer he is looking for.
Banks Six-gun with a speed loader.
npccpartsman- Thank you, I believe that was the answer he is looking for.
Banks Six-gun with a speed loader.
Last edited by cfrives3; Oct 16, 2007 at 07:21 PM.
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Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
He really needs to invest in a FASS system for his truck if he wants to protect those expensive injectors and a good ITP regulated return system would be better than nothing. At least it would do away with the dead headed fuel system.
What he's feeling is programmed defuel caused by the banks system, but everything else we all said is true.
What he's feeling is programmed defuel caused by the banks system, but everything else we all said is true.
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