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Old 10-06-2017, 01:14 PM
rleffler's Avatar
rleffler rleffler is offline
Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 3,782

There is a test device that can sniff for fumes, very similar to how your hvac guy looks for CO. I'm fortunate enough that a hangar neighbor has such a device. It simply starts beeping and gets louder the closer to the leak. There doesn't need to be visible fuel leaking, just the presence of fumes will set it off. I have no idea how expensive the device may be. I borrow it every year at the condition inspection.
Bob Leffler
N410BL - RV10 Flying
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Old 10-07-2017, 04:44 PM
JackinMichigan's Avatar
JackinMichigan JackinMichigan is offline
Join Date: Nov 2012
Location: Canton, MI
Posts: 174

Originally Posted by digidocs View Post
Hi Jack,

If you haven't already, check the seals on the fuel valve. They aren't always designed to hold more than a few psi of pressure.

By golly, that was it! Thank you for your suggestion. I disconnected and capped the line going into the valve and pressurized the system, and it held 50psi solid for several hours. My primary concern is the lines down in the forward part of the tunnel, which I can neither see nor fix without great effort. The rest of them are much more accessible if I start having issues.

Again, thanks.
Jack and Dave Groat, father and son
RV-10 N1861G
Build #41389, started Oct 2012
Current status: 1st Flight 11/10/17
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