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Old 12-09-2017, 06:32 AM
  #6  
Marshfly
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Join Date: Oct 2014
Location: Houma, LA
Posts: 491
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Originally Posted by smac999 View Post
get a tank sensor and always know the exact amount. I wouldn't trust a calculation on how much you've used and how much is left.
The engine knows exactly how much fuel is being run through the throttle body on modern fuel injected outboards. My last three Yamaha setups have been within a quarter gallon on every single fillup and I can attribute that difference to changes in the way I pump and the slope of the concrete at the service station. A buddy with an Evinrude G2 sees the same level of accuracy.

These aren't estimates. This is the engine computer telling exactly how much fuel it is metering into the injectors.
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