So yeah I've done a bit more work to this which I'll post later but figured I may as well record the issue and solution I had with my injector pump.
I fired the ute up for the first time in 5 years and it was as if the throttle was stuck open. No obvious things like overfull oil level, jammed throttle cable etc and I could turn it off from the key so had to be the injector pump. Seems no mechanics attempt to work with these themselves, I got a quote from an injection specialist of $1600+GST to rebuild the pump...
So I had a go at it myself.
Issue is the governor link was seized on the pivot shaft. The little spring was fully compressed and it took a decent amount of force with a screwdriver to pry it open. There was still too much resistance on the shaft so I removed the governor link and soaked it in CRC for a few hours till it freed up completely. The governor link was held in by some triangular (dont fuck with me) bolts so I welded up 3 points of an old 6pt 14mm socket then drilled the centre to suit.
All done now and back together, will slap it back in with a new timing belt and tensioner tomorrow.