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12-01-2012 | 03:28 PM

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Jack Holland

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From: Mercedes, TX

RE: Help needed in debugging a fuel system fault.

Hi Ragz,
Everyone has been dancing around it. Pneumatic Resistance in the fuel lines between tanks. Hardware too small.

This can cause leaks on a proven system, which will give the air bubble issue. I have switched to the large festo fittings from Tom Cook at Jet ModelProducts. I use the 3/16 ID tygon fuel line from the vents, thru the tanks, and Tom's fuel accumulator, to the pump. Any thing on the suction side of the pump is 3/16. Pump to turbine is usually 4mm which is fine. My Olympus is slightly stroked and performs flawlessly with this set-up. JMP has everything you need. An easy check is when you fuel up. If there is any swelling of any tank in your system, there is resistance.

Jack Holland

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