LBZ: Rail Pressure

[x MadMAX DIESEL]

May be a dumb question. I have been without a lift pump for abit now, I've changed up the regulator current pretty good since trying to make due without a pump. 19,500 is the lowest it has gone since I took off the pump, with an average of about 21,000 at WOT.

I thought people usually get about 10,000 psi when they don't have a pump.

With that being said, I really don't know if I'm actually running out of fuel or not? so I'm not so sure a lift pump can bring the RP up to where I think it should be

 

[wdino73]

I really not sure but I think the LBZ stock cp3 puts out 26,000psi. can u uplug the fpr an see what it's putting out, just trying to help,

 

[x MadMAX DIESEL]

With the DVT Scan tool, I can bring the truck up to whatever I want without a problem. Just thinking here. It's low but not low enough to make me think its crying for fuel so idk how much the pump will help when I get it back. Which will be about 2 months from now.


Yes you are correct thats what they should be able to hit, and hte older trucks was 24,000

 

[Cougar281]

Yes you are correct thats what they should be able to hit, and hte older trucks was 24,000

I think that is more a limitation of the ECM & fuel pressure sender than the CP3's abilities. I could be wrong though.

 

[JoshH]

I'm not really understanding what the question is.

 

[wdino73]

I think he just misses his lift pump. LOL

 

[KEVINL]

My truck runs like crap without a lift pump

 

[sweetdiesel]

I'm not really understanding what the question is.

:stupid: :teknology:

 

[GMC_2002_Dmax]

If you want to test it out put a SPST switch in line to the CP3 and kill the power to it, that will cause the regulator to go WIDE OPEN and you will see if it makes any difference.

You can also command "0" amps in the lowest 2 or 3 rows in the regulator amps table to do the same thing.

 

[SmokeShow]

What kind of demand are u asking for. Meaning, what pressure & pw is pulling the rp down?

 

[x MadMAX DIESEL]

Sorry for the confusion guys, I was just thinking outloud. I was just thinking that it was alittle bit odd that I only held about 23500 psi with a lift pump. And now I average 21000 without it and I'm running more pulse width than when I had it.