Max fuel pressure and MPG question

Dieselkid18

New member
Mar 5, 2015
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Hey, this is my first post Duramax Diesels. I joined because of not really liking how other forums didn't really like to help other members as much as I've witnessed on this forum. And also how they treated new bees like myself (not going to mention any other forums). Anyways,

My truck is not making max rail pressure. I'm only making 21,000 psi when 23,000 is commanded on a Tech2. Would this have any effect on my mpg when trying to achieve good mpgs (very light foot). My truck has started to feel sluggish down low lately, and yes, I know my lift and tires aren't helping me at all, but the truck just feels sluggish. I do have EFI live. Right now I am running these tunes http://www.duramaxdiesels.com/forum/showthread.php?t=40597

I have heard lots of good things about the guys tuning and my dad used to work with the guy so I don't feel too scared about running his tuning from the tune library.
 

Dieselkid18

New member
Mar 5, 2015
6
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Fuel pressure low during power enrichment. I'm thinking my cp3 and/or injectors are on their way out.
 

Minnesota DMAX

New member
Jan 11, 2015
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I'm having the same problems. Low on power.and p0087 p1093 and 1094 codes. can't command over 4000psi at idle.truck is going into limp mode constantly won't rev over 2000rpm