REFLECTOR: engine driven fuel pump
Ron Brown
romott at adelphia.net
Fri Aug 26 09:19:51 CDT 2005
G'morning Kent,
The engine driven fuel pump is a diaphragm pump just like on older cars. There is an eccentric cam in the gear train that actuates a lever arm in the pump. This lever arm actuates a diaphragm. Check valves on the inlet and outlet of the pump makes it all work. There is no pressure regulator. The faster the engine turn the faster the diaphragm moves pumping the needed fuel. The rubber diaphragm won't supply but so much pressure - about 25-30 pounds in the case of a Lycoming. In the older cars it was only about 5 psi - like the Franklins and carbureted Lycomings.
Ronnie
----- Original Message -----
From: kent
To: Velocity Aircraft Owners and Builders list
Sent: Friday, August 26, 2005 9:04 AM
Subject: Re: REFLECTOR: engine driven fuel pump
Thank you all (Ron, Chuck, Steve, Scott, TEC...) for your great responses. I feel better knowing my engine driven fuel pump is at least in the right ballpark.
How do they work? I picture a geared drive but with an internal pressure regulator independent of RPM, maybe with a relief valve. Or is there some fancy mechanical device that compensates for RPMs but turns out to be even more reliable?
Kent
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