Yanmar 1GM, Operation Manual

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[9-1.] Fuel oil system
1) Fuel tank and fuel supply.
1-a) Fill the tank up.
1-b)
Drain the fuel tank every 250 hours of operation.
Open the fuel tank drain cock to drain out any foreign
matter which may have accumulated in the bottom of the
tank.
When you start the new engine for the first time or after
long storage drain after 50 hours of operation.
1. Precipitation tank
2. Drain cock
1-c)
If the vent in the fuel tank cap is obstructed, fuel will not flow. Clean the fuel tank cap and
blow dry periodically.
2) Air bleeding in the fuel system
If air enters any part of the system, with the exception of the fuel tank, fuel will not be
injected into the cylinders. Check the fuel injection "sound" in the following manner.
2-a)
Pull out the engine warm up knob and place the control lever in the "half speed" position.
2-b)
Open the delivery cock of the fuel tank.
2-c)
Loosen the fuel strainer air-bleed bolt.
2-d)
Move the priming lever of the fuel feed pump up and
down. All the air has been bled out of the fuel line when
only fuel flows out. After bleeding retighten the bolt.
1. Fuel Filter
2. Fuel feed pump
3. Priming lever