1987 LJ70 - what are the electric stuff on the fuel filter?

[Gubbtratt1]

I assume #3 is a water sensor and actuates the filter light, is this correct?

What are #1 and 2#, and what do they do?

 

[Eurasiaoverland]

1 = vacuum switch. Senses when the fuel viscosity is such that there is an excessive vacuum required to draw the fuel up through the filter.
2 = not sure as I have never seen this before, but seems to be linked to the fuel heater. Maybe a relay? Can you peel back the rubber boot?
3 = float switch to indicate water in the base of the filter. It should illuminate the filter light on the dashboard.

 

[Gubbtratt1]

Thanks!

2 = not sure as I have never seen this before, but seems to be linked to the fuel heater. Maybe a relay? Can you peel back the rubber boot?

I managed to get a relay out of the rubber boot. It's actuated by the vacuum switch and ground and actuates the wire circled on the new picture. Is this the fuel heater?

 

[Eurasiaoverland]

Thanks!

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I managed to get a relay out of the rubber boot. It's actuated by the vacuum switch and ground and actuates the wire circled on the new picture. Is this the fuel heater?

Yes, exactly. My Hilux has the same thing but without the external relay.