I just like to see any car that has used wvo and sat around for a period of time subject to a good system soak and cleaning. When pumping the injection pump full of a solvent you get any residual stuff in the lift pump soaked as well. By products of wvo seem to change consistancy with time. Becoming a glue like substance or extremely sticky.

I do not think the suspect stuck element piston is that big of a deal. I did suggest soaking the relief valve as well when off as it may be held open by the stuff . The lift pump is covered my way at the same time.. Easy for a valve to be stuck in there as well. Or not sealing as it should with waste buildup. Removing the secondary filter dumping it and filing it with the laquer thinner gets the thinner into the injection pump quicker as well.

I right or wrong approach things so I will not have a road stoppage issue or reduce the chances of one as much as possible. I learnt long ago that any stoppage on the road you cannot quickly rectify will cost you money usually. Overall you will normally lose a days time with the event. In fact they can be a real inconvienience if well away from home.