TOUTED by successive federal governments in Oz, since the mid-nineties, as environmentally friendly and non-damaging to engines, E10 is anything but that. E10, or standard 91 RON (research octane number) unleaded, blended with ten per cent ethanol, has drawbacks that make it particularly unsuitable in a marine environment.
The main one is known as phase separation, which occurs because, like diesel, ethanol is a hygroscopic fuel or one that attracts moisture. In fact, petrol needs to have only 0.5% water content or five millilitres per litre in it before the ethanol will absorb this water and separate from the petrol. The ethanol/water mix sinks to the bottom of the fuel tank, right where the fuel line pick-up is located. The carburettor will then draw in this mix and obviously the…