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There is a test port on the fuel line between the lift pump and the fuel filter mounted to the side of the engine. Connect a snubbed/dampened 0-100PSI gauge there to measure baseline fuel pressure. Should have 20-25 at idle ramping up to 60PSI by peak torque RPM. any dips in that pressure are...

Thats one reason i went manual, dead easy. Two hoses, pump, adjustable flow control(for lowering speed control), couple of fittings and done. No wiring…. Uses plain common AW-32 hydraulic oil available everywhere… Totaled it up for someone last night, just over $250 in parts from...

Peak tq RPM is also know as peak volumetric efficiency. It is the point where you develop max tq output for the fuel consumed. It is determined by bore, stroke, manifold design and valve timing and design. now if you can still make enough tq to accomplish the task at a lower RPM, you may see...

so what happens when you select cab and raise on the manifold and use the hand pump?

A1R, yes, one configured to properly interface with the data bus. Superman should have one… look at recent thread CTIS electrical smoke…

Yea you are already doing all the hard part, swapping an already setup pumpkin will only add 30 minutes to the front tops…

I think the 3126 and C7 both fall in around 1200-1250 RPM PK TQ. From what I can tell the 3116 is a little higher at ~1550...

My what a long truck you have...:) Eco hubs will fix the fan cycling every 5 minutes on the highway. Driving a truck above peak torque RPM is like driving with an exhaust brake on. you burn a ton of extra fuel overcoming pumping losses at high RPM that does nothing extra to propel the truck...

3.90 is closer to the ideal, but the 3126/C7 have lower pk torque RPM So either works OK. the difference between the two is only ~5%. You will of course have 5% less final pull force/thrust with the 3.7…

Well never was much of a gambler:) Ok, if K11 and K26 removed did not stop 77 from tripping, there are only a few other places that power goes, and all of them are in the drivers dash. The alarm buzzer in the dash, which is controlled by grounds provided by the low air switches or the...

Yea you would need a different 2 output PCU and wiring, or add a Y gate solenoid to switch the LMTV single channel PCU output between the front and rear systems. have thought about this as an option to my manual control system if needed, but my build goal is to try and balance the axle...

My reason for betting on K11 being the path that causes the short, is that when K11 energizes with the ignition sw, it provided power from CB77 to the start switches. One of those switches is down on the passenger frame rail/out in the weather. If the wiring has been damaged or the sw has...

The key word there is “claimed”…

My manual CTIS method has never let any smoke out... just sayin:)

Pull relay K11(alt excite) and K26(neutral start) and see if it still pops CB77. If it doesn't pop 77, re-install one relay at a time and see which one pops CB77... need a direction to follow. My money is on K11 providing the short circuit path:)

What general said:)

you are going to have to train an anchor detail to operate the thing:)

yea there are half a dozen crossed P/Ns

Yes, all type 16 driveshafts…

Yea thats not the right p/n for the 3116 pump… There are at least 2 pumps used on the 3116. The standard highway version and the Agricultural version. Not sure if the marine version uses a different WP. I believe the 7AG in our s/n denotes this as an AG engine. The pumps rear housings bodies...