Osborne Tip Tank
kit(s) and installation requires removal of the factory selector valve
and replaced by the Osborne fuel selector valve assembly.
Osborne fuel selector
valve assembly accommodates the added Tip Tanks.
This fuel selector assembly consists of two (2) each selector
handles. Each handle is
used to select its respective fuel tank side i.e. Right hand handle
selects RH Tip Tank, wing aux tank (if installed) and RH main tank, Left
hand respectively . The
advantage of this design allows any individual tank selection.
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Description
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Probable Cause
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Correction
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Selector valve(s)
turns hard
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Worn out
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Replace
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Valve handles hit each other when selecting cross feed (both tips)
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Wrong handles and or valve assembly
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Replace with correct assembly
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Valve is hard to turn
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Worn out/dry
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Grease seat and replace shaft
seal
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Fuel stain at selector shaft
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Worn out/dry
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Grease seat and replace shaft
seal
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Fuel bypassing valve
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Worn out, foreign Debris caught in seat
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Replace valve
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Handle is loose after installation of new
clevis pin
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Worn out handle and or
selector valve shaft
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Replace handle/valve assembly
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Valve handle is attached to selector shaft with a screw on type (handle)
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Non approved valve
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Replace with approved part assembly
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Valve turns with no feel or tank position detenting
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Wrong selector valve body or worn out detent assembly
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Replace with approved part
assembly
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Fuel gauge: See 55027
Fuel Transmitter: see 55025
Osborne Kit P/N 12070-1 Comanche PA30
and PA39
Brief Description: Tip Tank fuel lines
are routed inboard to just outboard of the main selector valve were the
Osborne “Aux Tip valve” is located, splicing the two (2) tanks.
The feed from these tanks are controlled by the cockpit “Aux
Tip” selector switch and of course the main selector valve selected to
“Aux”.
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Description
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Probable Cause
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Correction
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Tip Tank fuel is bypassing (siphoning) into wing Aux
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Bad Aux Tip Valve
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Replace
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Tip Tank will not feed
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1. Clogged vent line
2. Aux Tip valve bad Tip selector (electoral) switch
3. Faulty Aux
4. Check power source to Aux Tip valve
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Clean
Replace
Replace
Replace
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Fuel
Transmitter: see 55025
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