ntc350 bc cummins no power in high gears?

thanks hay carter fuel pump is on, feed lines are new,filter base is new,filter new. the only thing I haven't changed which I noticed today is the return line which is leaking pretty bad......

I doubt this is my problem, but the question I wanted to ask is there HIGH pressure or any PRESSURE on return side of the fuel system on this truck? I wanted to convert the factory return line from that crappy nylon braided hose to a ptfe plastic hose similar to plastic air lines like the newer truck fuel systems are plumbed. just wanted to know about pressure on return side if any.




GUTLESS is ok I understand its not as potent as the 425 cat but this isn't my first NTC either that's why I say theres a problem here and its not the HP jump down I did. my first truck was a 85' ford l9000 day cab had a 300hp cummins 9spd and 4.10 rears truck on a 10x20 tube tires real shirt wheel base would pull 80k-90k reefer containers out of the port a lot harder then this 350 pulling rail boxes. the ford never had this issue and had a smaller ntc 300 motor and still pulled like the #### never limited or governed me I was the one who had to control it by keeping my foot out of it, but this is just absurd that this truck pulls in low range and nothing uptop. only problem was truck was so short the load would pull me around at 60-65mph but the truck still pulled......

truck doesn't miss or smoke at idle runs like a sewing machine, so I doubt its the overhead or a dead cylinder which would have an audible miss or something to note at idle.

I need to figure this out or im just going to sell truck its just crazy to think there isn't much on this topic.

 

hey smokinCat well when I pulled off the lines im taking it the one the supplies the AFC is the one coming from the aftercooler fitting to the the closest fitting that gets screwed on nearest the block.

the line that is wet was coming from the return that's for sure it was the -8 line that came off a T on the side of the block going to the return fitting on top of fuel tank. I just had it changed today had one made at NAPA was the most expensive hose ive ever paid for, AT LEAST I have no more fuel leaks.....

 

i had another person ask if i had checked aftercooler to see if it wasnt clogged up, they said if the air charge is to hot or not enough that the engine would not make peak boost or just a real hot charge, almost like driving without a cooler whatsoever. he told me if the charge is to hot it wont build sufficient boost? is this true?
i have to change water pump cause its weeping water from the pump, was going to check the screen on cooler water inlet lines to see if screens is gummed up or blocked.

my next question is could i just get a intake manifold off a newer n14 and convert my truck to a2a and add the extra pipes? they told me for the cost of rebuilding aftercooler i could just go a2a, will i notice any difference and will i gain any more HP

 

im changing it out today regardless, so the set screw on back of solenoid must be turned out or in? to not restrict?

also i found the screen that goes before the aftercooler, ive read from various forums were people just delete this screen as the water filter on engine acts as same screen, any input?