Fuel Injection

When used with a liquid fuel, the engine is supplied through a fuel injection pump coupled to the crankshaft. This positive displacement pump is on the right hand side of the engine and the volume of fuel delivered each revolution of the crankshaft can be adjusted by rotating the outer case of the pump. This adjustment increases or decreases the stroke of the pump's piston.

The pump is supplied from two graduated cylinders and the rate of fuel use can be determined in steady state by noting the volume used in a measured time interval. The pump is also coupled to a flow gauge that measures the instantaneous fuel flow to the engine. Measure at the mid-point of the float ball and use the calibration table to determine the fuel flow rate.