Dennis,

 

My Legacy tanks hold exactly 33 gals each.  I put a measured gallon in each side and calibrated that to read empty.  Then I added increments of measured 4 gallons to each tank and calibrated those increments to be one eighth increases.  So a full tank reads 32 gal, a half tank reads 16 gal, etc.  I actually have one gal more than the reading at each indication.  So far this calibration seems to be holding very well.  If I use 8 gal, it takes 8 gal to fill it back up.

 

However, I don’t usually fill the tanks because the vent tube will leak it overboard if it is too full.  Three quarters full is enough to exceed my bladder capacity!  :>)

 

Bill B

 

 

I am trying to calibrate the fuel probes on my IV and trying to determine when I should see an indication on the fuel probes.   Can other IV builders tell me how many gallons they had in the tank before they saw a increase in output from the fuel probe.   I have the EI P300C probes.