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There are two external harnesses for each tank. The main tank external harnesses go from the connectors on the rear spar to the FQPU.
The center tank harnesses go from the connectors on the front spar to the FQPU.
Each connector attaches to the spar with an adapter. You can remove and repair the connectors without entering the tank.
Training Information Point
Each fuel tank sensor has a separate twisted wire pair. Thus, a single wire failure does not affect the whole tank. You can make splices in the wire harnesses only with limited conditions. These conditions are specified in the wire harness repair procedure in part II of the airplane maintenance manual (AMM).
You pull the insulator to disconnect the Faston connector. You push the insulator onto the tab to install the Faston connector. The shape of the insulator does not let you put a wire on the wrong tab.
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777 AIRCRAFT MAINTENANCE MANUAL

FUEL INDICATING -FQIS -WIRING HARNESS

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FUEL INDICATING -FQIS -COMPONENT LOCATIONS -WINGS

FQIS Connectors
Each half of the center tank has one FQIS connector. It is on the front wing spar near the wing-to-body fairing.
Each main tank has two FQIS connectors. They are on the rear wing spar, outboard of the main landing gear shock strut, near the landing gear trunnion door.
Fuel Temperature Sensor
There is one fuel temperature sensor in the left main tank. It attaches to the rear spar of the left wing, below the main tank inboard FQIS connector.
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FUEL INDICATING -FQIS -COMPONENT LOCATIONS -WINGS

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FUEL INDICATING -FQIS -FUEL QUANTITY PROCESSOR UNIT

Purpose
The fuel quantity processor unit (FQPU) does these functions:
*
Calculates the fuel weight for each tank

*
Calculates the total fuel weight

*
Shows the weights on the IRP indicators

*
Sends the weights to the AIMS

*
Causes the refuel valves to close

*
Monitors the FQIS for faults

*
Sends fault data to the CMCS.

Location
The FQPU is on the E5-3 shelf.
Physical Description
The FQPU is in a 5 MCU ARINC 600 container. The container has twelve printed circuit boards. The FQPU connects to airplane wiring.
Training Information Point
The FQPU has software that is data-loadable.
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FUEL INDICATING -FQIS -FUEL QUANTITY PROCESSOR UNIT

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FUEL INDICATING -FQIS -POWER

General
The FQPU connects to two isolated 28v dc power sources at one time. The FQPU operates when one or both of the sources have power.
Power Sources
The FQPU gets power from four different sources:
*
Captain’s flight instrument bus

*
Right dc bus

*
Ground handling bus

*
Hot battery bus.

During normal operation, the refuel station door is closed. The FQPU gets power from the captain’s flight instrument bus and the right dc bus. The two power sources are connected together inside the FQPU. Whichever has the higher voltage supplies power to the two FQPU channels.
When the refuel station door is open and the ground handling bus has power, the fuel quantity power transfer relay energizes. This causes the FQPU to get power from different sources. The FQPU gets power from the ground handling bus and the hot battery bus.
If ground handling power is not available, you put the refuel station power switch in the battery position (BATT). This causes the hot battery bus to energize the refuel power transfer relay and the fuel quantity power transfer relay. When the two relays energize, the FQPU gets power from the hot battery bus only.
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FUEL INDICATING -FQIS -POWER

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FUEL INDICATING -FQIS -FUNCTIONAL DESCRIPTION

General 
The FQPU has two channels, 1 and independently. Each channel includes circuit card and an ARINC 629/429 card.  an  2,  that input/output  operate (I/O) 
　
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