The worst case is afterburn taking out the exhaust valves . The Biodiesel esterification process removes the glyerol as soap. The safe way to burn pure vege is with a fuel heating system so its fed to the engine at about 80 degs C. The driver starts on diesel then switches to veg when up to running temperature.
Fuel leaks on these engines are extremely rare. It is most likely the seals on top of the pump and this is not a DIY job. You will need to clean the area with Jizer or something like that to get rid of any oil and fuel residue that has accumulated and get it to a Bosch diesel specialist.
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I have a 2019 fiat ducato, just out of warranty. Check Engine warning appeared, fiat garage replaced filter and sensor and not fixed. They contacted fiat technical and ive now being told I need a new Diesel Particular Filter and Exhaust Gas Recirculation Valve at a cost of £5.6k..

In order to conserve the injection system as much as possible, we suggest that you check the diesel filter of your Fiat Ducato often, use quality fuel and try not to keep your tank almost empty because this could create corrosion. Regarding the diesel filter, it should be checked during the overhaul of your Fiat Ducato. Do not hesitate to
Page 104 Diesel fuel fluidity decreases at low If refuelling with diesel fuel not suitable FUEL FILLER CAP temperatures due to the paraffin it for the temperature of use, add The fuel filler cap C-fig. 153 is fitted contains and can clog up the fuel filter. DIESEL MIX to the fuel, in the pro- with a key lock and a device B secur- portions
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fiat ducato check diesel fuel filter