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mchristian(at)canetics.co
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PostPosted: Mon Feb 13, 2006 12:07 am    Post subject: No Title Reply with quote

I have the TCM IO240-B3B in my Shekari. I have tried three fuel pumps and finally am ending up with the facet 40107. The reason I have tried three pumps was due to lack of sufficient information regarding the Fuel Injection sytem design and fuel requirements of the engine. I learned by trial and error with a little help: an electric pump putting out 3psi and 30gph wouldn't make any pressure at the fuel distributor (too much pressure loss in the system). I then tried a FI pump putting out 45psi and 45gph (thinking I could possible regulate it down); this overpowered my gascolator which had to be replaced. Too much pressure and flow caused priming issues and would result in difficulty running the engine on the pump due to overrich conditions - based on the metering. This could have been rectified with a bypass type regulator, but I didn't want to add complexity to the fuel system. I ended up checking all facet pump types and settled on the 40107 because: no check or anti
-siphon valves, 7-10psi and 30gph. I prime for three second at 3psi showing on the fuel distributor. The engine starts right up. Not sure how it works at keeping the engine running (I suspect insufficient pressure).

I think the reason Diamond went to the Dukes was because there were some early issues with mechnaical fuel pumps on these engines. They had a priming solution with teh Facets but no backup for sustaining flight. They found a solution in the Dukes that can perform both.

Reagrds,
Mike


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