The vaporiser needs a coolant feed from the engine, to prevent the expansion of the gas from liquid to vapour causing freezing (LPG is a great refrigerant, shame you can't easily fill your AC system with it - 40p a fill anyone :) I found the best place to plumb this in is by diverting the oil cooler return hose (item 14 in the picture). This will easily reach if you remove the rubber end where this goes back to the coolant manifold (under the throttle body) and plug this into one of the vaporiser water outlets. A new piece of hose is then used to join the other vaporiser outlet back to the coolant manifold. This forms a permanent flow circuit in the coolant system with little disruption.
This shows positioning of the Leonardo controller - with all of the other equipment installed in a Sterling engine bay this is about the only place left ! it also offers good protection from heat and damp, so is a natural choice. Also the sole access hole into the passenger compartment (I mean the only one _already_ there, no need to drill anything) is just below the brake servo also on this side.
Slight close up of the controller, this shows where the injector cut-off wiring is placed. The red wire in the pack of 7 going to the injector relay pack is cut and connected back to the normally-connected relay in the controller, this is set to engergise when the LPG mode is selected - thus cutting the petrol to the engine off.
These next two pictures show the tank and its mounting, which is quite straight-forward using threaded M10 rod through the boot floor. The front-most bolts go through the angled floor though, so need about 30 degree bends putting in them.
You can see more clearly on this photo where the solenoid is mounted inside the tank (to protect the main feed line in the case of an accident). It's bolted securely through the bottom of the tank base and wired in parallel with the gas solenoid wire on the vaporiser, they both turn the gas on when the ECU gives the change-over signal and they cut the gas when the engine stops running.
Mounting of the filler. There's a paper template sticker that comes with the filler, you stick this to the bodywork and drill the required holes (the main 28mm centre one can be done with a ring of small holes and a file, but I borrowed a hole borer to do this one .. takes a lot of care !)
The finished article ..
Parts list
