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Engine turns fast enough but does not start.

No or too little fuel supply.

Fuel tap is closed, water or other contamination in the fuel and / or filters. Tank vent is clogged. Clogged pipe. Regulator control rod is fixed (WD40 on syringes to enable).

Stop button.

Is still pressed in or is incorrectly adjusted, for example due to wear of the cable. Stop solenoid lingers on an electrical stop button.

Air leak.

This can be a porous fuel hose, but often a filter / bleed nipple is no longer properly sealed.

Air filter clogged.

Clean if it is a mesh filter and replace with paper.

Compression too low.

Valve clearance is not good. Worn piston rings / cylinder wall. Burned-in valves, a cause of valve clearance that is not set correctly. Leaking head gasket.

Cold start installation not OK.

1 or more glow plugs are broken and / or preheated too short.

Injector malfunction.

With older engines, the spray pattern may no longer be good, so that the fuel is not injector correctly and does not ignite completely. The injector must then be overhauled.