The NSI sump tank has a holly float mechanism between the

incoming

fuel

line

and the tank. The incoming fuel boost pumps are switched by a

low

level

switch on
the sump tank and fuel flow shut off by the float on the tank.

Fuel

does

not

seem to
heat up at all.

vince robertson

Does the plane in question have EFI?  If not, what is the value of

this

observation?

Tracy

Hey Tracy,

    Yes they do use EFI. All stock Subaru on the engine as far as I can

see.

John Gibbons

Ronald Freier wrote:

So, does this system use four fuel pumps?
Two to keep the sump tank full and two more for the engine? If so, seems
like alot more complex than an Andair or just using 2 valves.
How would you design a sump tank system for a low wing aircraft without
using 4 pumps?

Ron Freier

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