Wow! Nice job, looks mint! Where you having issues before the pimp up?
Well we run between 4 and 8 back packs. As we use them for other tasks. (still delivering water)
The one on my van, has not been pimped

It is just a BB back pack and thats it.
The issues we have had are......
Pump wont produce any pressure
Pump gets very noisy, then fails.
Front half of pump fails
Rear Half of Pump fails
PCB controlling the speed of pump fails (caught fire and burnt out)
Constant air locks on one pump.
To me it looks like the pump is the total issue in these!