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Date: Wed, 24 Nov 2004 08:07:04 -0500
Subject: Re: [FlyRotary] Bubbles in fuel line from pump - today's update
From: Bulent Aliev <atlasyts@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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> 1) Remove the flow sensor and the 4-way selector valve and replace it
> with a simple shut-off valve followed by a T to two high-pressure pumps
> followed by one or two filters?

Finn, I installed the fuel filter before the pumps. Fuel should be sucked
through the filters. If there is a water in the fuel, the electric pumps
will beat it into a fine emulsion and may pass through the filters.

> 2) Return point to tank should be what size and position?
> 1/4", 5/16"?
> Bottom of tank?
> Top of tank?

Mine is at the top of the tank. Less back pressure.

> 3) Use the two facet pumps to transfer from wings to fuselage tank,
> presumeably to top of tank to avoid a flow back to the wing tanks. (If I
> ever get around to fix the leaks in the wing tanks).
> 
> What size fuel line to and from high pressure pumps?

I used everywhere 3/8' aluminum tubing for the low pressure parts and AN-6
braided hose with AN fittings for the high pressure parts.
> 
> Any recommendation for a simple shut-off valve?

Home Depot brass ball valve with Teflon liner and stainless ball

Bulent