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

Ron,

    On the NSI Glastar there was two pumps. The first was a 3.5 psi pump for
filling the header tank and the second was the high pressure pump for
pressurising the rails. I didn't like the idea of just having one high
pressure pump but NSI is supposed to be introducing a second seperate
throttle body style system as a backup. The first Soob Glastar I flew had
two parallel high pressure pumps for redundancy and gravity fed the header
tank mounted below the baggage floor. With the right sized fuel lines I
don't see why you couldn't gravity feed from a low wing, my C-140 crossflows
quite quickly if I select BOTH with only one tank full.

John

 
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