Diamond Aircraft DV 20 E 2022, Airplane Maintenance Manual

Page: 439 / 903

AIRCRAFT
DV 20 E AMM Fuel
Doc # 4.02.25
Rev. 2
28-40-00
Page 1
15 Mar 2022
Section 28-40
Fuel Indicating
1. General
The DV 20 E airplane has a fuel quantity indicating system. The fuel quantity indicating system has
a capacitive sensor. The gauge on the instrument panel measures the current flowing through the
sensor. The gauge is marked 0, 1/4, 1/2, 3/4 and 1/1.
2. Description
Figure 1 shows the location and installation of the components in the airplane.
The fuel quantity indication system has only two components. It has a fuel quantity sensor and a
gauge.
The fuel quantity sensor is a located in the top of the fuel tank. It has a tube which goes close to the
bottom of the fuel tank.
Five screws attach the sensor to the top of the fuel tank. A cork gasket makes a fuel-tight seal
between the tank and the sensor. Two electrical wires connect to the sensor.
The fuel quantity gauge is on the right side of the instrument panel. The gauge gives a constant
low-voltage supply to the fuel quantity sensor. The gauge measures the current flowing in the circuit
to the sensor. You can adjust the gauge to give the correct zero indication.
The main bus supplies current for the system. When the float moves up or down, it changes the
resistance of the circuit through the sensor. The current flowing in the system decreases as the
resistance increases. The fuel quantity gauge uses the current to set the pointer.