lml@lancaironline.net Mailing List Archive

>"My concern is that a small amount of water may fill the fine mesh pores and create enough pressure drop to stop fuel flow. "

And I would add "water or other contaminates" and "stop fuel flow" translated as OFF AIRPORT LANDING.

>"I think it is best to minimize resistance to flow upstream of the fuel pump, what do you think?"

I think it is better to say it is ESSENTIAL not "best".

Does anyone know where the airplane "AIRTIME" is??

Charlie K.

----- Original Message ----
From: Bill Hannahan <wfhannahan@yahoo.com>
To: lml@lancaironline.net
Sent: Saturday, September 29, 2007 12:55:41 AM
Subject: [LML] fuel tank drains

[You might comment on installing additional inline automotive (non-bypass) very fine filters upstream of gascolator.

Charlie K.]

I’m not sure what comment to make Charlie. Most cars are fuel injected with a high pressure fuel pump in the tank. They can overcome a substantial filter pressure drop.

Most small aircraft suck fuel out of the tank relying on the small pressure difference between the vapor pressure of the fuel and the tank static pressure. My concern is that a small amount of water may fill the fine mesh pores and create enough pressure drop to stop fuel flow.

I wonder if that might be a factor in Gene Long’s mystery fuel flow interruption.

Aircraft carburetors and fuel injection systems have fine screens in their inlets, but they are downstream of the aircraft fuel pump, so a much greater head pressure is available.

I think it is best to minimize resistance to flow upstream of the fuel pump, what do you think?

Regards,

Bill Hannahan

wfhannahan@yahoo.com

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