Okay, the tanks sat on the grass in the back garden. Pretty much empty and with the fill and the feed valve removed.
As said before, I've no residue in any of the filters. No residue on the float or around the outlet valve.
Even though i'd applied 12 volts the tank valve and heard it clank, I didn't know if it was actually shutting off ......... now I confirm it is closing air tight.
Just got in from work and stuck a USB camera probe down the welded feel tube in the tank.
As far as I can see, there is no corrosion in there
So this is leading me to the front end of the car .........
Question, does the reducer have a non return valve on the lpg side that stops any liquid / vapour flowing back towards the rear of the car ?
Thinking back, I did have a few issues with it running like a sack 'o shite which was pretty much cured by tweaking the temp settings up
Last year, I also had issues with the manifold pressure wandering all over the place, causing me to tweak the adjustment screw every week or so
I'm thinking that i've ripped the back end apart for nothing and the real problem is the reducer
At the end of the day, it is bolted on the chassis, underneath the water bottle and within inches of the exhaust manifold
I can't do sweet f all at the moment due to the weather but fingers crossed tomorrow I can rebuild the back end, remove the reducer to directly apply 12 volts to it and have a good suck / blow
I'll also go through the electrical connections which are under the airbox to see if i've got a bad connection