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Fuel drips out vent under engine

Comanche Fuel System

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Topic starter 28/04/2020 5:33 pm

Fuel drips out vent under engine

by Timothy Quigley » Mon Nov 16, 2015 12:26 am

My partner just texted me a pic saying we have gas dripping "at about 2 drops per second" out of the tube in the attached photo. It's a 260B fuel injected with LoPresti cowl. I plan to look at it tomorrow but can anyone tell me what it might be? Just got another text...he says the dripping stops when fuel selector is set to off.

We just had the fuel selector value rebuilt and reinstalled about 10 days ago if that helps.

Any thoughts appreciated.

Tim

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Re: Fuel drips out vent under engine

by JIMICS2452 » Mon Nov 16, 2015 3:22 pm

Track the line feeding the vent. It should lead you to the culprit. In my case is was a fuel pump, but it was not on my Comanche.

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Re: Fuel drips out vent under engine

by Charles Schefer » Mon Nov 16, 2015 3:26 pm

I'd guess leaking thru the internals of the fuel selector since turning it off solves the leak. Had the same issue on a Cessna 340A.

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Re: Fuel drips out vent under engine

by Timothy Quigley » Tue Nov 17, 2015 2:15 am

Traced the leak to the electric fuel pump. Is this a normal thing, something we should monitor, or something that indicates it's time to replace the pump? The drip
Is coming from the black line in the photo going through the floor.

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Re: Fuel drips out vent under engine

by Kristin Winter » Tue Nov 17, 2015 5:55 am

If it is coming out that drain line, it is because the seal between the motor and the pump has gone bad.

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Re: Fuel drips out vent under engine

by JIMICS2452 » Tue Nov 17, 2015 1:30 pm

Jim Hiatt

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Re: Fuel drips out vent under engine

by Timothy Quigley » Tue Dec 22, 2015 4:42 am

Closing the loop on this, we tracked down a factory new Weldon pump from aeroinstock.com. So that makes both fuel pumps plus the fuel selector in less than 6 months. Hope that's it with that for a while.

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Re: Fuel drips out vent under engine

by N9241P Jeff Gaskill » Wed Dec 23, 2015 3:27 am

I had a problem with the fuel pump on my 260B earlier this year. I see from your photo that you have a Dukes pump. You will need to buy the available STC to legally convert the Dukes to the specific Weldon for the 260B. I was told by Maurice Taylor, past ICS technical expert, that the Weldon is a much better pump than the Dukes.
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