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Fuel quantity indication on both  Fuel quantity indicator  Replace the fuel quantity 
tanks incorrect/blank.  defective. Fuel quantity indication system wiring defective.  indicator. Do a test of the indication system wiring. Refer to Chapter 92-00 for the wiring diagrams. 
Fuel low level caution shows on the annunciator panel when the left tank has more than 5 US gal of fuel.  Fuel low level sensor defective.  Replace the fuel low level sensor. 

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% Maintenance Practices % 1. General
% The maintenance practices in this Section tell you how to replace a fuel tank probe and a fuel tank % sensor.
% Refer to Section 31-11 for data on removing/installing a fuel quantity indicator.
% Obey the safety precautions for fuel at all times.
% WARNING: DO NOT GET FUEL ON YOU. FUEL CAN CAUSE SKIN DISEASE.
% WARNING: DO NOT ALLOW FIRE NEAR FUEL. FUEL BURNS AND CAN CAUSE % INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
% WARNING: DO NOT BREATH FUEL VAPOR. FUEL VAPOR CAN MAKE YOU ILL.
% 2. Remove/Install a 'Low Fuel' Sensor
% Each tank has a low fuel sensor.
% Obey the safety precautions for fuel at all times.
% A. Remove a 'Low Fuel' Sensor % %

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Detail Steps/Work Items  Key Items/References 
(1)  Remove the wing that has the low fuel sensor that you will remove.  Refer to Section 57-10. 
(2)  Remove the access panel from the root rib of the wing: S Remove the 11 nuts and washers from the studs. S Pull the access panel off the studs and clear of the airplane. 
(3)  Disconnect the electrical cables for the low fuel sensor.  At the in-line connector. 
(4)  Remove the low fuel sensor from the tank. 

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% B. Install a 'Low Fuel' Sensor %

Detail Steps/Work Items  Key Items/References 
(1)  Install the low fuel sensor in the fuel tank: S Apply sealant to the thread of the low fuel sensor. S Move the low fuel sensor into position in the fuel tank mount. S Screw the low fuel sensor fully home into the mount. S Tighten the low fuel sensor.  Use Loctite 243 or 'seal-lube' or 'fuel-lube'. The arrow must point down. 
(2)  Connect the electrical cables to the low fuel switch.  At the in-line connector. 
(3)  Install the access panel at the wing root rib: S Put the access panel into position on the studs. S Install the 11 washers and nuts. S Tighten the nuts. 
(4)  Install the wing, but do not refuel the airplane.  Refer to Section 57-10. 
(5)  Do a test for the correct operation of the low fuel sensor.  Right tank: Make sure that it switches off the fuel transfer pump when the fuel level is low. Left tank: Make sure that it switches on the LOW FUEL caution light when the fuel level is at 3 US gal (+2/-1 US gal). 
(6)  Refuel the airplane.  Refer to Section 12-10. 
(7)  Do a check for leaks. 

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% 3. Remove/Install the 'High Fuel' Sensor
% Only the left tank has a high fuel sensor. % Obey the safety precautions for fuel at all times. % A. Remove the 'High Fuel' Sensor
　
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