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Hi All,
From: "Ron Milligan" <ronmilligan@cox.net>
Date: 2004/06/29 Tue AM 01:01:22 EDT
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Fuel System Question
... My
question is, if I plumb the transfer line (one tank to the other) into the
fuel return line (coming from the engine) will the facet fuel pump have
enough pressure to over come the returning fuel? Is the returning fuel
under any pressure at all or just flowing back to the tank?
Let's look at this logically. The only time you'll have fuel returning to the tank is when the engine is running (or a few seconds after shutdown). The fuel pump is creating a negative pressure situation inside the tank by removing fuel. The engine is burning some of the fuel being pumped out of the tank, so there will always be less fuel coming back than is being pumped out. Therefore, there should never be a head pressure against the return line - unless one positions the return outlet below the level of fuel. Put the end of your return line near top center and you should never have a problem.
Regards,
Dale R.
COZY MkIV-R13B #1254
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