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Traced back from the LPG switch and found two relays that switch the pulsed injector ground. Presumably there's two for redundancy but both were fubared. Bypassed them and it fired up no probs. I should have been an auto elec.

I know it has fuel pressure at the injectors. It has new fuel. But there's no pulse to gnd on the injector loom. And I know it's not the ECU as I've swapped out 3 times.

So LPG system cutting injectors pulsed gnd is a common configuration?

It's definitely not switching to ground. There has to be a break of the gnd wire between the ECU and injector loom. Now, it also has an LPG setup. Could that be causing the break?

What can I use to clean them? Or should I get the cleaned somewhere?

I have a VP 3.,8L that sat in mate's paddock for 3 years. It was running when last parked. Code is 12 System OK. Security Key is in correct position. Have also tried bypassing Security Key. Have new fuel. Have fuel pressure to the injectors. Injectors look clean. Open circuit / no short in...