Don't wanna Hijack but, just a quickie...
When Earthing the Pump, is it OK to just Splice into the Earth wire or should it be cut?
I Spliced in and the pump definately spins harder but sometimes when revs drop back to idle, it sounds like the pump slows down a bit like it is still being controlled. (Due to Battery under the Bonnet, I have only Earthed my pump, not upped the Voltage.)