Fuel Pump Install 86.5
10-20-2014, 11:58 PM
#16
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Location: Centennial, WY
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This is an interesting site. Just as a comment regarding the "age old question" of replacing vs waiting for failure, I'd like to just add a little observation based on my 53 years as an aerospace engineer. Aircraft engines, as we all know, are an instrumental part of an airplane that is intended to be around six miles above earth (as vs. Porsche 928s that are generally only 6" above earth, not counting tires). Accordingly, since most mechanical failures in a well-designed part are associated with cyclic fatigue, it is a necessity that engine parts like compressor and turbine disks be replaced before they reach their projected fatigue life. Test engines (known as lead-the-fleet-engines) are constantly operating on test stands at the engine manufacturer in order to gain insight regarding expected engine life. Engines in the field can never have as many operating hours as the lead-the-fleet engine.
So, we are only six inches or so off the ground so that argues well for waiting for a failure (as long as you carry your cell phone with you to call your favorite towing service).
I am currently keeping my towing service busy because of fuel pump problems. I now have a brand new fuel pump on my '87 S4. It would appear that my problem is associated with fuse and relay contacts (please see my note regarding fuel pump problems - author as bjbpe) but there is a faint possibility that the filter was not changed at the same time as the pump. Anybody out there who might want to hazard a guess as to whether a fuel filter could cause the problems I'm having?
So, we are only six inches or so off the ground so that argues well for waiting for a failure (as long as you carry your cell phone with you to call your favorite towing service).
I am currently keeping my towing service busy because of fuel pump problems. I now have a brand new fuel pump on my '87 S4. It would appear that my problem is associated with fuse and relay contacts (please see my note regarding fuel pump problems - author as bjbpe) but there is a faint possibility that the filter was not changed at the same time as the pump. Anybody out there who might want to hazard a guess as to whether a fuel filter could cause the problems I'm having?
10-21-2014, 03:46 AM
#17
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http://www.avweb.com/news/savvyaviat..._196909-1.html
I"m just an EE but I can read well. Since going on the RCM methodology, my down-time has fallen, and I've avoided some maint induced failures. However, just two weeks ago I saw it happen in person. I was having a fault in my intercom headphones, and we worked on the jacks and the wiring. once we put it back together, the pass side wouldn't xmit at all. We were working on the receive side, but we broke a wire in the xmit side and didn't know it until it was tested. A small thing, but notable because it was working fine until we touched the system.
I"m just an EE but I can read well. Since going on the RCM methodology, my down-time has fallen, and I've avoided some maint induced failures. However, just two weeks ago I saw it happen in person. I was having a fault in my intercom headphones, and we worked on the jacks and the wiring. once we put it back together, the pass side wouldn't xmit at all. We were working on the receive side, but we broke a wire in the xmit side and didn't know it until it was tested. A small thing, but notable because it was working fine until we touched the system.