The M151a1 that I own has a plug-in socket just below the oil filter. Don't know what it was for… perhaps an engine heating blanket for cold climates? Any ideas?
if it is a 3 pin connector it is the low oil pressure shut off switch ...
Pretty sure its for a block heater or test port ............
not a test port Jeff's got it right .. ???
it's the Fuel Pump Safety switch that cuts off the fuel pump in the event the oil pressure drops. Assuming you have the electric fuel pump on the A1 and all the correct wiring is in place.
I am not a mechanic, so I almost hate to answer that question. However, if your engine is running and the oil pressure is good, then this switch is just waiting to be activated by a drop in oil pressure. It is then supposed to cut off the electric fuel pump which will only allow the engine to run as long as there is fuel in the carburetor. I don't know how long that would be, but it is supposed to mitigate damage to the engine. I've had a fuel pump go out and the engine didn't run very long. I've never looked up what the oil pressure limit is or how to test the switch, so I'm not sure of any of the parameters. I assume that is documented in the 20 manual where I got the picture. Also, as I understand, that feature was removed when the A2 came out with the mechanical fuel pump in place of the vacuum pump which also right there by the oil filter so it's only on the A1. That's about the extent of my knowledge. Hope it helps.
Maybe some of the real mechanics will jump in here and help you out on what to watch for.
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