Aircraft Fuel System jet pumps?


aware of jet pumps being operated in learjet airplanes -

non-mechanical - non electrical pumps - no moving parts -
"motive flow" (high pressure) comes fcu (engine fuel control unit) -

purpose normal feeding of engines fuel -
back-up 28v dc electric pumps (3 of them) located in tanks -
learjets "tip tanks" have 4 jet pumps - "longhorn" types have 2 jet pumps -

remove "water fuel"...? - kind of aeronautical magic that...?

edit -

know there positive pressure in tanks of airplanes in flight...?
feed engines - no need engines "suck fuel" tanks -
positive pressure coming from...?

since talk of learjet - here answer airplane -
there constant 0.8 psi ambient air pressure obtained ram pressure -
ram air pressure...? = think of pitot tube dynamic pressure -

in airliners, comes inlets near tip of wings -
@ inlet under expansion tanks - interconnected tanks -
pressure, proportional airspeed - there relief valves -
.

this may stupid question, jet pumps electrical or operate if there fuel pressure supplied engine driven pumps or electrical boost pumps. purpose? know can remove water fuel, why else used?


Cars & Transportation Aircraft Next



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