Fuel gauge reading

[cfttrading]

Hello! I´ve installed a EMS120 in my RV7A. When calibrating the fuel gauge I have run into a problem. Due to the angle of the tank the fuel sender are at the top at 60 liters. The full tank contains 75 liters. When calibrating the senders they didn´t give any reading after 60 liters. The EMS asked if we had added 10 liter and we answered yes. Despite this the fuel gauge tells me that the right tank contain 60 liters and the left 62 liters. I have registered 75 liters/tank and a total of 150 liters. How to get the gauge to show 75 liters when the tank is full?
Best regards,
Niklas

 

[pbennett]

The senders can only sense the first 60 litres. That is what the EMS will display.
It is possible to add senders at the outboard end of the tank and combine the outputs with the inboard senders. You have to know what you are doing though! Otherwise the only way you can "see" the level between 60 and 75 litres is to use the fuel totaliser function driven by the fuel flow sender. I assume the D120 is the same as my EMS D10, in which case the totaliser shows the sum of the tanks. It will tell you your fuel quantity between 150 and 120 litres, but won't tell you which tank it is in.
I have installed a MGL FF1 Fuel Computer. It gives me two calculated fuel tank levels, and I can switch the fuel flow sender between these calculated tanks when I change physical tanks. This is important to me because my tip tanks increase the "invisible" fuel by 30 litres each side.

Peter

 

[jakej]

FWIW - I physically check the tanks before I fly, the lower range (indicated by gauge) of fuel is most important to me. KISS.

Jake J

 

[cfttrading]

Thanks for answering my question, its good to share information like this. Fly safe
Niklas