rnewman(at)tcwtech.com
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 Posted: Tue Dec 29, 2009 9:39 am Post subject: pressure testing fuel and break lines |
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I'm finishing up work inside the tunnel including a change out of my low pressure fuel pump to the new Andair fuel pump. (converting my engine over to fuel injection from a carburetor) and preparations for a return fuel line for use with a purge valve. With all these new connections I decided it would be a good idea to pressure test my fuel lines prior to declaring completion of the task. I made up a test rig with a Schrader valve and 0-80 psi gauge and connected it to each wing tank line and filled the system with 40 psi air.
After filling the system with air (40 psi) and tightening the obvious leakers I'm now indicating about a 1 psi per hour leak down, however using refrigerant grade bubbling solution has yielded no more obvious leaks..(Its very difficult to fully swab down the andair fuel valve itself, but I have done every connection)
Has anyone else done this sort of testing and if so did you get to zero psi drop?
Thanks,
Bob Newman
40176
www.tcwtech.com
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