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Anyone know what pump this is?


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Supposed to be a Fuelab 41401. Says Fuelab on it. Has a serial number. Fuelab isn't getting back to me...

 

It's supposed to have 3 terminals. Instead, I have 3 wires sticking out. Red and black ~10 gauge, and the middle one is actually a 3 wire group of 16 gauge red, black, and green wires.

 

PO attached this free form circuit to it:

 

20150614_175008_zpscvcven9x.jpg

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Fuelab has responded that it is one of their older ones. :(

 

Dammit eBay.

 

The new versions of this pump do either a high/low speed switch, or variable speed controlled by a pwm signal.  This looks like an attempt at a high/low switch, with the switched voltage knocked down to ~4V via the resistive voltage divider.

 

Could they tell you how the older models did their speed control?  Maybe the older models used an analog voltage input instead of PWM?  That would at least make the values for the divider network make more sense...

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