Hi ,
On all my Troopers there is either a combined or single unit fuel filter / hand priming pump. On one , the pump has a water drain and it is located just before [and slightly below] the filter. In all cases the filter is the highest part of the system [downhill to injector pump and fuel tank]. I do not like the sound of routing the fuel line "up and over the engine" - definitely a possible source of airlocks.I think you could install any hand priming pump and re-route the fuel line and that should solve the problem.Can send a photo if you have problems.
Great to hear you are mobile - even if its only 5 feet!
Cant help with a scoop, as I have never seen one, and the last thing I want is more power!! The clutch is definitely the weak point of these very powerful engines, and pulling a 3 ton trailer up a steep hill can do severe damage if you are heavy on the throttle
Good luck.