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A fuel tank is a part of an engine system in which the fuel is stored and propelled (fuel pump) into the engine. Fuel tanks range in size and design according to the car model. Fuel may contain water or impurities which affect the tank material and/or piping system (corrosion, clogging, wear of seizure of precision parts) and in some cases the burning process. There are many different methods and materials used to wash and clean engine fuel tanks. Unfortunately these methods depend on removing the tank from the car in a process takes not less than three hours from a professional person. This paper introduces a new simple method to clean the fuel tank while it is in place without taking the tank out of the car. The idea depends on timed steps to inject different safe washing fluids using a specially designed nozzle and remove them after washing in a total period of time of 15 minutes.

Water piston internal combustion engine is a very simple propulsive engine invented in the 1970's to be used in different applications. The water piston engine consists simply of L shape tube immersed in water where the water column inside the tube acts as a piston. In the present study, two propulsive units from this engine were compared. The two units are identical in their dimensions except the exit port where one is curved and the other one is sharp. The effect of this shape on the engine thrust, fuel consumption, power and number of effective firing was investigated. The effect of combustion chamber size on engine performance is also considered for the two units in this study.