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  Monitoring two fuel tanks, one gauge

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Author Topic:   Monitoring two fuel tanks, one gauge
Binkie posted 08-18-2006 10:53 PM ET (US)   Profile for Binkie   Send Email to Binkie  
I have two built in fuel tanks, and would like to monitor the tank I am using with the one gauge and a switch. Any ideas?
an86carrera posted 08-18-2006 10:59 PM ET (US)     Profile for an86carrera  Send Email to an86carrera     
My 36' had just that setup.

1 guage 1 switch port and starboard position on it.

I always drew from both for the twins but the tanks were on circle circuit of plumbing. It was nice for fuel and engine diagnostics too.


jimh posted 08-19-2006 01:36 AM ET (US)     Profile for jimh  Send Email to jimh     
Each tank has its own sender. You switch the meter between them.
Binkie posted 08-22-2006 07:10 PM ET (US)     Profile for Binkie  Send Email to Binkie     
With my electrical knowledge I need a more detailed answer, thank you. Rich
swist posted 08-25-2006 03:59 PM ET (US)     Profile for swist  Send Email to swist     
Buy a single pole double throw (SPDT) switch (a MARINE rated one, not one from Radio Shack). You do not need a high capacity or any fancy switch.

Mount the switch somewhere convenient.

Connect the "S" terminal from the fuel gauge to the center terminal on the switch. See other articles in this forum for marine wiring standards (crimping, shrink-wrapping etc). Connect the pink wire from fuel tank 1 sender to one of the outside terminals on the switch, and connect the pink wire from tank 2 to the other outside terminal.

The only gotcha is that some switches have the outside terminals reversed so that when you throw the handle to one side, you are connecting the wire from the other side, and vice versa. A little experimentation will easily show you which tank you are selecting on which switch position.

Binkie posted 08-26-2006 08:15 AM ET (US)     Profile for Binkie  Send Email to Binkie     
Thanks swist, I understand it now.
JayR posted 08-27-2006 08:00 PM ET (US)     Profile for JayR  Send Email to JayR     
NMEA 2000 display..... Good reason to get started.
swist posted 08-28-2006 08:13 AM ET (US)     Profile for swist  Send Email to swist     
"NMEA 2000 display..... Good reason to get started."

Well that's going to make a lot of sense to someone who can't wire an SPDT switch.

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