It is not that easy.

In the last 40+ years I have driven 4 Mercedes, W114 280, W126 280S, W126 300SE and now W210 280. In total over 2000,000 km.

• If you want a system with LPG injectors you need a sequential fuel injection system.
• The LPG system get the timing signal (when to open and how long) from the petrol injectors.
• The K-Jetronic is not a sequential system so that won’t work, you can only use as older type vacuum controlled LPG system or a system that is designed for the K-Jetronic.
• An other problem is that LPG only works if the engine temperature is above 40°C , it takes a lot of head to evaporate LPG, under 40°C the evaporator freezes. For that reason there are no cars with only LPG, only Bi-fuel, you have to start with petrol and switch to LPG when the engine is warm.
• The valve seats need to be replaced with harder seats, LPG does not lubricate the seats and they get hotter.
• A good LPG system is not cheap, certainly a lot more than the repairing a K-Jetronic.

Rob