Fuel Switching on the F15

[Gault05]

Does changing the fuel switches on the f15 impact how it uses its fuel in-flight? Even if it has fuel tanks on board? Trying to get a better understanding of how its supposed to work is all.

[Baz000]

I think it just changes your fuel quantity indicator but not how the fuel is used

[mvsgas]

Does changing the fuel switches on the f15 impact how it uses its fuel in-flight? Even if it has fuel tanks on board? Trying to get a better understanding of how its supposed to work is all.

No, It only affects the Fuel quantity gauge.

 

For more info on how it work on the E model, look here:

http://www.f-15e.info/joomla/en/technology/fuel-system/93-fuel-quantity-indicator

 

I will post if I find info on the C version.

 

Fuel System

The F-15C/D is equipped with an automatic system (fig. 10-1) that gauges

and transfers fuel without crew input. It provides pressurized fuel to the

engines under normal conditions, and gravity feeds fuel for limited engine

operation during electrical or hydraulic system failure. The system is

comprised of internal, external, and conformal fuel tanks, gauging units,

pumps and plumbing

 

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The fuel distribution (transfer) system uses three electric impeller type

pumps; one in each internal wing tanks, and one in fuselage tank no. 1.

Each auxiliary fuselage tank is equipped with an injector pump operated by

transfer pump pressure. The system automatically transfers fuel from all

tanks to fuselage tank no. 2 which feeds the right engine, and to tanks 3A

and 3B which feed the left engine. The conformal tanks contain two electric

impeller type fuel transfer pumps which transfer fuel to internal tanks.

External tanks are pressurized by regulated engine bleed air during flight and

transfer fuel to internal tanks. Fuel is transferred first from external tanks to

any tank that will receive fuel, and normally external wing tanks transfer to

the centerline tank, then to fuselage tank no.1.

 

The fuel indicating system (fig. 10-3) shows total fuel aboard the

aircraft in pounds. The fuel quantity indicator shows fuel aboard on the

INTERNAL scale, and total fuel (internal, external, and conformal tanks) in

the TOTAL LBS window. The fuel low level warning system senses low

fuel quantity and lights the fuel low warning light on the Caution Lights

Display Panel. A manual bingo setting on the fuel quantity indicator can be

used to set a predetermined fuel level that will automatically stop fuel

dumping and illuminate the BINGO FUEL light on the Caution Lights

Display Panel.

 

 

Fuel is stored in eight internal tanks (fig. 10-2); one in each wing and

six in the center fuselage. Internal fuel capacity is 2,070 gallons. An

additional 1500 gallons can be stored in conformal fuel tanks installed at the

wing/fuselage intersection, and an additional 1800 gallons can be stored in

inboard wing and centerline external tanks when installed. Internal and

conformal tanks contain foam blocks to prevent explosion or fire, and all

internal tanks are self-sealing. Tanks 2 and 3A are specially designed with a

horizontal baffle that traps fuel for inverted flight.

 

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Edited November 10, 2017 by mvsgas