Online Community of Zenith Builders and Flyers
Have any of y'all safely saved a chunk of $ by opting for something other than the $1,000++++ aviation models?
With respect to safety, how much latitude is there with respect to pressure and other differences in fuel pump design?
My own case is an IO-240 (fuel-injected) in a 750/2.
I've got an IO-240B in my Kitfox, and I use a Weldon 8163A, I've heard there are some decent pumps from Summit Racing
that will go to the higher pressure that should work. I had a Holley Blue until test flight four, when the O-Ring on the
engine driven pump failed the pump cavitated, then I learned 12-14 psi wasn't gonna run my engine. You need 20+
PSI on the IO-240B. Lower pressure will work for priming, but not run the engine. The 8163A I have would probably
not run run the engine at full power, but probably get me enough power to make an airport. Running the IO-240B
on the electric pump would be a trick, you would have to go full mixture and then tweak throttle to find the sweet
spot to run the engine, then reduce mixture and throttle to slow it down, again finding the sweet spot, etc, etc.
Since the variable output of the engine driven pump normally regulates pressure (and consequently mixture)
would be lost regulating power would be tricky. BUT I think you could do it.
Go to www.teamkitfox.com and search the archives there's been several IO-240B fuel pump threads over there.
Thanks, Jeff, this is really helpful.
Have you run your engine on the pump alone? That is, is it good for backup?
Here's a pump that looks like it might be a good candidate, I would plumb it with a
check valve in parallel to allow free flow of fuel when the pump is not running. Now remember
these pumps have (two) purposes - Priming, and Emergency backup. If you run an electric
pump while the engine driven pump is running, you will probably flood the engine. SO
you don't want to run this pump at other times.
Thanks. Good information.