washing fuel tank with water,,,,,,,,,,,,,,one of my cousion has done that on his cultus and after few weeks he end up in changing the fuel tank and all the pump assambly,,,,,,,,,,there are chambers inside the tank , like walls ,,,,,,,and its hard to flush all the water from it ,,,,,,,,,,,,,just after few weeks rust develop in tank and become a big mess and at the end there was no option other than replacing every thing ,,,,,,,,,,,,,,,,