2002 24v recently had NO BUS problem but got it fixed. Still doesn’t start, fuel pressure gauge says 10-15 psi. There’s fuel at the injector lines on the head but not much. Won’t even start on ether, p0122 p0123 p1693 are my codes. VP44 less than a year old, air dog 150 gph and Edge juice bigger injectors are the only mods. I’m lost here and really need some help. 

It should run on ether regardless, but personally I would not use it. You need to do hot wire test on vp44 to rule it out. Make sure you're getting good pressure at vp, but it shouldn't really need much pressure to start as long as there is fuel to it. Now as soon as it starts you should have no less than 14 and I would not go over 20psi. 15-18 is a good place.