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[Rockcrawler]

Even though it isn't, any ideas ?

 

[Clarky]

You need to clean the gunge off the tank sensors I would think.
The grot sticks to the sensors and they think they are immersed in water.
Be careful as you clean them though as they can be a little delicate.

Richard.

 

[Rockcrawler]

Thanks Richard I will have a look

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[tonyidle]

As Clarky says. I've had success by half filling the tank with water & washing up liquid & leaving it to slosh around for a few miles.