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Leaky Fuel Selector Valve


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Mechanic found a leaky fuel selector valve. While looking through the illustrated parts catalog, I noticed O-rings at each connection. I would assume (you know what they say...) that you could remove the selector valve, clean it, and likely just replace the O-rings to resolve the leak. It appeared to leaking at one of the connections on the valve. Ideas? Common place to have a leak?

Thanks for your thoughts and comments!

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Not so common...

But known to wear over time... the valve parts wear... what your pic is showing is not wear and could be worse...

Wear related Leaks Often get found by funny FF data, as air enters the leak... and gets picked up as fuel volume...

it is better to have the plane burn fuel, then to have too much air entering that leak...

Lasar rebuilds/OHs those devices...

Clean it up to find out why it is leaking...  check the logs to see.... never mind....:)

Get your mechanic to do a fuel injector/baby bottle test.... if you see a lot of air bubbles exiting the FIs you know where it is coming from... at least that spot...

See the orange torque seal paint on the parts...?  that is/was there for a reason.  When the parts were assembled that paint is put in place like a safety device... looks like somebody has removed some of it or it came off... or the parts were disassembled and not torqued and re marked properly...

Start looking all over the plane for signs of missing safety devices... safety wires and torque paint... Nobody likes it when stuff falls off in flight. Or leaks out things that are needed to be kept in.  Or allows air to enter where it doesn’t belong... missing torque seal is a sign of a less than skilled mechanic possibly doing maintenance on your plane.  Keep both eyes open.  Expect to find more weirdness with your situation...

Got anymore surprise leaks?  Leaks are not normal.  Blue stains are best to be found and identified.

Great you found that while you were on the ground...

Is your mechanic a skilled Mooney Mechanic? Torque seal isn’t Mooney magic. Ordinary mechanics should be pointing this out to you...

PP thoughts only, not a mechanic...

Best regards,

-a-

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I would start by cleaning the valve with acetone to remove all of the old staining and then see where the leak is.  The lines coming in are under gravity pressure, the return line from the engine will have lower pressure from the engine driven pump.

I’ve never had to fix one, but they look like they should be able to be disassembled and repaired.

Clarence

Edited by M20Doc
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