I THINK THIS IS ONE OF THE MOST UNUSUAL SELF INFLICTED DRAINS I HAVE BEEN CALLED OUT TO, IT WAS A COLD WET WINTERS SATURDAY WHEN I GOT THE CALL TO ATTEND THIS CAMPER VAN WHO THE OWNER WISHES TO REMAIN ANON. PARKED ON HIS DRIVE AT HOME HE WAS BUSY GETTING THE VEHICLE READY TO GO ON A WEEKEND TRIP OUT WHEN HE REALISED HE HAD INADVERTANTLY FILLED THE DIESEL TANK WITH WATER MISTAKING IT FOR THE WATER TANK,  IT TOOK FOUR HOURS HARD WORK TO COMPLETELY REMOVE THE FUEL TANK AND CLEAN IT OUT BEFORE HE COULD GO ON WITH HIS TRIP IT WAS HARD WORK BUT WORTH IT IN THE END