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-   -   alternative for facet fuel pump carburated engine (https://vansairforce.net/community/showthread.php?t=148920)

Sam Buchanan 04-24-2017 07:32 PM

Quote:

Originally Posted by rv7charlie (Post 1168141)

Hey Sam, I might be wrong, but aren't you thinking about the PSO (positive shutoff) valve, and not the check valve? If I understand it correctly, the check valve shouldn't prevent flow with the pump off; it just prevents back-flow if you have a pair of pumps plumbed in parallel.

Yep...I am...I think....

Point being there is reason to select a Facet with care, not all are suitable for our application. I'm using two Facets (primary and backup) full-time on my latest project with a non-mechanical pump O-200. The things were designed to run full-time for years in the automotive world.

Kyle Boatright 04-24-2017 08:24 PM

Quote:

Originally Posted by 170 driver (Post 1168152)
Yes I agree about the percentages, but there are more than a handful of failures documented on this site and only one could be disaster. I'd prefer to use another pump if there is another proven option available.

I don't think you're gonna find an option out there that has 5,000+ in service and a relative handful of failures. You may find a different option, but you'll have a hard time finding any statistically useful information about it or its service history.

rv7charlie 04-24-2017 09:02 PM

Quote:

Originally Posted by 170 driver (Post 1168152)
Yes I agree about the percentages, but there are more than a handful of failures documented on this site and only one could be disaster. I'd prefer to use another pump if there is another proven option available. Mine probably has trash in it too and I'll put filters before the fuel selector in both tank lines now and replace the pump.

There are any number of failure modes in any number of devices that could be disaster. And any device can fail at any time, regardless of reliability. Our job is to have a plan B. With a typical Lyc installation, the Facet is plan B. For its failure to be a disaster, you'd need a failure of the engine driven pump *and* a failure of the Facet (you test before every flight, right?) *at the same time*. If that happens, I think your number's up.

deek 04-24-2017 10:39 PM

Same Facet pump since 1982 - about 3,300 hours. Female NPT ports; gets used at least 3 times every flight.

170 driver 04-25-2017 05:59 AM

Thanks for the input from all, looks like I missed the memo on puting a filter before the pump. Fairly easy to fix and hopefully will solve my problem.


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