Detroit 12.7 fuel pressure

Fuel pressure ,You can change rpm by using switch for cruse switch on then use other to rase or lower rpm by pushing switch up to rase rpm to where you need it hi to keep heater hot at idle

 

MY truck does the same thing. In 10th gear running highway speed 65 mph at 1500 rpm or so im running 60 psi on gauge on dash. Now if im in 10th gear and come up to a hill and lay into the throttle to increase my speed my fuel psi will fall down into the red on the gauge around 40-45 psi and thats with my foot into it. I would think fuel pressure would raise as im trying to accelerate up the hill. Funy you ask this as im trying to figure out with rebel127 right now why my truck isnt pulling as hard in 9th and 10th gear and im only making 28psi on boost. I should be in mid to upper 30's with the bw171702 turbo and work rebel127 did on my truck. NOt sure on mine if its fuel lines collapsing cam timing or bad injector. My truck runs awesome on flat land but throw a hill at it and the boost and pulling power drop off.

 

Ya I've gotten more mpg and power for sure. The truck has a new cac new boots new bw171702 turbo new bully dog exhaust manifold. I've read that the intake manifold gaskets can deteriorate and cause leaks that's the only spot I have not checked yet and it would be the last thing that hasn't been replaced or gotten new gaskets (which I have on the shelf). My truck does seem to have a surge so to say in 9th and 10th gear from about 1300-1500 rpm like it's not getting enough fuel and it the motor shakes the truck a bit. Or at least that's what I think is happening. So I don't know how to check that out?

 

I'm 28 max at any time. Something isn't right.

 

Man I wish I could just get 20psi boost I can't seem to get over 14 pounds on the gauge wondering if that's normal for a 430hp Detroit we just got the truck haven't had a chance to do all the checks for boost leak but don't hear any going up hills