I have a 4 week old motorhome on a Boxer chassis. Currently the injectors are sitting in a pool of water and are rusting away as we speak

I have contacted Peugeot to no avail they say never heard of problem. Meantime my van has a rusting engine. The water seems to get in fromthe windscreen scuttle which is not sealed properly. Has anyone else come across this and if they have, has it been fixed and how?
Any advice on potential problems this might cause with the engine ie cutting out etc greatfully received.