I was asked to tear down a plane that had crashed, and find the problem , the FAA and Rotax had inspected the plane and decided it was a pilot problem, the fuel bowls were empty and they were able to bypass all systems and start the motor , I found the FACET fuel pump that was inline to have failed and totally shut off the fuel, one person died because of the crash, DO NOT PUT A PUMP INLINE < PUT IT IN A BYPASS LOOP or leave it out you do not need a boost pump on most aircraft engines , also fly the plane no matter what happens ...BOB   

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Is there a diagram/drawing for a by pass loop for the 601/650

>>>GIL, first of all dont put ethanol in a 912 uls motor and thankfully they dont sell the crap in alaska ..BOB

Yeh I would rather not put ethanol in my 912 either but in some places that's all we can get unless it's avgas which isn't good either. The disadvantages to both can be minimized with proper handling...Blue Stabil in ethanol and don't let it sit very long or it'll probably go bad even with the stabil in it. And TCP(Decalin Runup) in avgas. Bout best some of us can do and it's being done every day. And after all even the 912 ULS is approved for ethanol.

Pick your poison.

Joe, I didnt realize that ROTAX approves ethanol, I thought it was only in rare cases when good gas was not available , what state are you in ? all that we have visited had RV gas PREMIUM unleaded, available , the biggest reason not to use it is because we have vented gas tanks and the alcohol grabs water from air and forms jello , BUYER BE AWARE!!!BOB

Hi Bob

Yeah, Rotax SI 912-016 authorizes 10% E fuels

Automotive fuels
In addition to AVGAS various automotive fuel types with different quality are available. Due to various
environmental, economic and political reasons a number of fuel types with different amount of ethanol blend is
available. Therefore the maximum amount of ethanol blend is defined as follows:
E10 (Unleaded gasoline blended with 10 % ethanol)
In addition to AVGAS and unleaded automotive fuel (Mogas) the ROTAX
912/914 Series of engines are
now approved for use with E10.
I've heard all the supposed problems associated with ethanol use. I don't like the stuff but after many years of use I haven't had any problems other than it goes bad pretty soon. I've always been skeptical of the stated problem of attracting moisture. That can be an advantage...the E absorbs the water in solution with the gas/E and it passes harmlessly thru the motor. When we get water in our car tank we pour in a bottle of heat right? Alcohol if I'm not mistaken. I understand if there's too much water the E can separate out with the water and now we got straight gas with unknown AKI. I've never heard of that actually happening; I suppose that scientifically maybe so but in my experience a non factor.The hoses and stuff we got nowadays are usually OK with E so with reasonable care that shouldn't be much of a problem. I did careful takeoff distance on my 701 with avgas and 93 E cargas and there was no measurable difference. I just run the stuff, like it or not.

Inquiring minds still want to know exactly what model facet pump failed, So far seems most of us are damned with the curse!

Chris, I believe the pump model #is 40105N, there is no Model #'s on the pumps, this # came off of the Pump Box.  ...Bob

On Facet pumps the model number is typically on the bolt flange with two numbers to the left of the hole and 3 to the right

It is a 40105 n pump ..BOB

There is an app called PURE GAS which shows all ethanol free gas stations in the entire U.S. on a map.very useful.

Great App...just downloaded it and found ethanol free 14 miles away. THANKS SHAWN!!

As I pause and ponder if I will continue at all with my original plan to install the $42 facet pump I bought for my  Rotax 912 equipped 701 I’m building, I’m contemplating installing it in a bypass loop, using it only to start the engine, switching it off for flight operations, and replacing it at each annual. 


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