REFLECTOR: engine driven fuel pump

[Jim Sower]

It's a lever type wobble pump that pulsates a diaphragm.  Reed type 
check valves prevent back flow.  Excess pressure is vented back to the 
intake.  Lever is driven by a cam.  Comes at us pretty much unchanged in 
the last 75 years or so.  I've seen fuel pumps that look exactly like 
the ones on our airplanes on a 1952 DeSoto.  Sort of like the 
Marvin-Dribbler carb - adapted from a 1920's farm tractor with iron 
wheels and no tires.  Hasn't changed much in the EIGHTY years since.

Ain't technology wunnerful? ... Jim S.


kent wrote:

> 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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