How do the fuel monitors work---Navman, Floscan, etc.??
This diagram shows you the parts of the system (transducer and a display).
To install it . . .
1. you cut your fuel line (after the fuel water seperator)
2. mount the display in your dash (requires a 2" hole) then snake the wire and transducer from the display in your dash to the section of fuel line that you cut.
3. Put hoses clamps on either side of the transducer.
That's it!! Shouldn't take more than 20 minutes total . . . the hardest part is snaking the transducer from the dash to the stern of the boat.
I'm not exactly sure how the flow is measured, but I suspect that there is some type of rotor inside the transducer that turns as fuel passes through the transducer and a sensor that counts the rotations of the rotor. Based on the times the rotor spins the computer (in the display) calculates the fuel flow.
Navman and Standard Horizon are the same flowmeter. I had a Navman 2100 on my last boat and it worked great . . . very accurate.