Disclaimer this works for us maybe not for you use at own risk we use this to put to sleep 2x 4.3l Volvos, on board fuel cell and a large shore tank
Prepare an engine storage mixture for each engine per the following formula: FUEL 3.78 LITRES FOGGING OIL 12.0 Fluid Oz FUEL STABILIZER 1Fluid Oz 2-STROKE OIL 0.1 litre (50:1 ratio) A can of fogging mixture contains 340g (12 fluid ounces) therefore you will need one can for each engine. Remove and discard the fuel filter, take a new filter and fill with fogging mixture and install filter on the fuel pump. Disconnect the fuel line at the engine fuel pump (or both if you have two containers of the mixture). Run engines on the storage mixture for approximately 10 minutes at 1500 RPM. This will ensure that all fuel system and internal engine components are thoroughly protected. Shut off engine before the storage mixture is used up.
cheers
peter