If you are laying up your motor-boat for a few months fuel contamination could be a real problem when starting up again. Marine Red Diesel Condensation in diesels tanks is the most common problem and it is recommended to avoid any space being taken up with moisture all tanks are filled for the lay- up periods. As marine fuel levels lower in normal cruising the moisture-laden air condenses in the tank due to the ambient temperature changes. At this point water finds its way into your fuel and filters. On the surface diesel bug can exist between the water and fuel having a detrimental effect on the fuel. Another to keep the tank full whenever practicable Petrol Better to leave the tank empty when not cruising for long periods as petrol can go off over a long period. Symptoms are poor starting or even failure to start. Many companies provide fuel stabilizers when the tank is left full during several months of none cruising. Fuel Doctor is one such company that provide a fuel additive which also helps to give maximum power, improve fuel economy and prevent fuel system contamination. Fuel Expansion Whilst full tanks for marine red diesel and when managed correctly in petrol tanks are steps to reduce the risk of contamination don’t forget that marine fuel expands on those warm days. A means to either collect any spillage, which should be removed as soon as practicable for safety reason, under the tank with a drip tray or leave a 10 % clearance space at the top of the tank to allow for expansion especially in the summer months. If cruising outside the U.K. in warmer climes you may need to increase the clearance space mentioned above to prevent spillage due to increased expansion! Conclusion Near Full or empty is the best way to leave the tank when storing.
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