I'm chasing a fuel issue on my brothers truck. 1996 f250 Auto truck has ts chip 6637 and 4in exhaust for mods
For some reason the truck is starving for fuel under light driving, barley pulls it self along at 60 mph.
Has 60psi fuel pressure at idle and no load wot
or slight throttle while driving it barley maintains 25 psi
flutters between 0-25 until you stop.
What he has replaced so far
new mechanical fuel pump( tried 3 so far)
new ford motor craft fuel bowl assembly
New fuel filter and fuel lines
Injectors where replaced with new alliant power( stock) 2 years ago
I dropped the tanks, cleaned them and put new pick up screens in them, pulled the lines and blew them out.
New injector orings
Also swapped in a good selector valve from another truck.
Does seem to smoke alittle bit when it starts to struggle ( blackish gray)
The chip is off the pcm
I've checked all the fuel lines over for leaks.
No codes and all the data values look normal
Hpo system is good
Could this be a head issue?
injector cups look fine no fuel in coolant or oil in fuel.
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