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Date: Mon, 22 Nov 2004 22:28:09 -0500
From: Finn Lassen <finn.lassen@verizon.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Bubbles in fuel line from pump - update
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Here's the update on today's testing.

1) Replaced quick drain valve with 1/8" NPT plug and put clear line 
between flow sensor and drain point. Test flight showed air and bubbles 
in that clear line. Gravity should have filled up the line after a while 
but didn't.

2) Removed flow sensor, clear line from pump to drain point. After 
running engine for a while the line finally filled up with fuel. Test 
flight showed air in that piece of line, and the "pressure" drop and 
bubbles in line from pump.

The line from tank to selector valve looks a bit squeezed at a bend, 
possibly the tank moves slightly in climb attitude and squeezes line more.

Plan for tomorrow:
Replace line from tank to valve (inspect fuel tank pickup at the same 
time) and test.
If no joy, figure out a way to eliminate selector valve (I'm not too 
happy at the prospect of not having a fuel shutoff valve, not even for a 
bried test flight).

Finn