@Nauta2 wrote:

I’m puzzled by the presence of a thin, translucent tube lying on top of tank. It’s about 10cm in length. Each end is attached to a connector that goes into the tank. I have no idea what it’s for. Any suggestions gratefully received!


If you have these two connectors with a tube between them – you don’t have the diesel heater ( unless it was installed to another Dip tube or in the engine return line )…
these two connectors are for a generator or can be used to feed a heater – one ( usually the inboard one) has a dip tube the other is the return connector…
How do I know – Just fitted a Planar 44D heater to my Cruiser33 and I investigated all the existing connections before adding a new hole to the tank…!