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% Both versions use the same fuel tank probes and fuel quantity indicators. The fuel tank probes are % however installed differently, thus requiring a different Revision Level of the EPROM in the Data % Processing Unit (DPU).
% (1) Version A
% Version A has %) a short (40 mm = 1.6 in) Teflon sleeve over the fuel tank probes near the outboard end, %) the EPROM, Part No. 3034219, Revision Level 1.002 (marked on EPROM) in the DPU, and %) a placard below the fuel quantity indicator stating that the maximum indicated fuel quantity
% is 15 US gal (refer to Section 11-30).
% Version A is factory standard up to serial number 40.054.
% (2) Version B (M.M 40-047)
% Version B has

%) a long (240 mm = 9.4 in) Teflon sleeve over the fuel tank probes on the outboard end,
%) the EPROM, Part No. 3034219, Revision Level above 1.002 (marked on EPROM) in the % DPU, and %) a placard below the fuel quantity indicator stating that the maximum indicated fuel quantity
% is 17 US gal (refer to Section 11-30).
% Version B is factory standard from serial number 40.055 on (M.M 40-047 installed).

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AIRCRAFT
% % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % Figure 2: Fuel Quantity Indication System Components, Long Range Tanks Installed %
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AMM

% B. Long Range Tanks (O.M 40-071)
% Figure 2 shows the fuel quantity indication system main components for the Long Range Tanks. The % fuel quantity indication system indicator is part of the integrated engine indicating system. The % inboard fuel chamber in each wing has a fuel probe and a fuel sensor. The long range fuel chamber % in each wing has also a fuel probe. The fuel quantity indicating system cannot be calibrated in % service.
% Electric cables connect the fuel probes to the I/O board of the integrated engine indicating system. % The system displays the fuel quantity on an indicator located in the instrument panel, below the % integrated engine indicating display.
% Electric cables also connect the fuel sensors to a low fuel caution light in the annunciator panel. % Refer to Section 31-50 of the AMM for more data on the annunciator panel.
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AMM

3. Operation
As the fuel level in the fuel tanks decreases, the area of the fuel probes which are “wetted” with fuel will also decrease. The amount of "wetted" area is converted into an electrical signal which sets the fuel quantity reading at the fuel quantity indicator. The fuel quantity indicator displays the quantity of fuel in the left fuel tank and the right fuel tank.
The fuel quantity indicator shows the fuel quantity both digitally and graphically. The digital display % shows the fuel quantity in US Gallons. The digital display will be replaced by a “Lo” caption if the % remaining fuel in one of the two fuel tanks falls below 5 US gal (19 liters). The graphic display shows
the fuel quantity in the tanks as a percentage of the maximum quantity.
% If the optional Long Range Tanks (O.M 40-071) are installed, the fuel quantity indicator also displays % the fuel quantity in one of the two long range fuel chambers. When the AUX FUEL QTY switch (next % to the fuel quantity indicator) is set to LH, the fuel quantity in the left outboard chamber is displayed. % When the switch is set to RH, the fuel quantity in the right outboard chamber is displayed. The fuel % quantity indicator shows the fuel quantity of the long range chamber only digitally, in US Gallons.
%  The fuel sensor operates a caution light on the annunciator panel. When the fuel level in the left tank or the right tank falls below 3 US gal (±1 US gal) the caution light comes on. Refer to Section 31-50 for more data on the low fuel caution light.
　
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