‘One of our questions deals with this for a Vetus, but the procedure is similar for other diesels’
Technical Consultant If you’re new to diesel engines it’s important not to run out of fuel. If you do, unlike a petrol car where you simply put more fuel in the tank, you will have to purge or ‘bleed’ the air out of the fuel system of a boat diesel engine.
Many modern diesels will ‘self-bleed’ (pump out any air drawn into the system from the tank) simply by using the starter (provided the battery is well charged), but older ones will not.
In these cases, the engine will have an electric or manual fuel pump. This allows you to let all the air out of special screws on the fuel filter and injector pump. Then you need to slacken the main injector pipes and spin the engine on the starter until fuel drips or spits out. One of our questions this time deals with doing this on a Vetus engine, but the procedure is similar for other diesels.
Your engine manual will give you more information. Ideally, though, never let the fuel tank go below about six inches on a dipstick.