Facet Electric Fuel Pump

I don't know what the SS503 means, I just know that pump as type 40107 and I have one in my Europa. The pump is only used for t/o and landing and doesn't appear to impede flow when switched off, I don't have a bypass.

On my Kitfox I had a Facet Gold Top pump but that was long ago, I think the 40107 is normal now isn't it?

Hi Mike,

My understanding is that Rotax have a specific Min/Max fuel pressure recommendation (2 - 7.2 psi?) How you achieve this is at your discretion ie what pump you use.

(This topic has been well discussed, on this Forum, previously.)

By chance I came across an article on RV12 pressure problems, very similar to mine.  The recommended/solution was for the installation of a higher pressure Boost pump.

My original pump specification was Max 5 psi.

The new pump is a Facet Cube, Part No. 40135, 4-7psi, Flow 121.13L/Hr.

This pump specification would appear to exceed the Rotax Max psi however with the #35 return line restrictor jet, Max registered pressure is around 5 psi.

Seems to me that the 40105 is the one. Actually I found a reference to this one in my plane manual

both of those numbers are aligned with the normal range for the 912uls OM

I’ve had to upgrade some Facet pumps in low wing aircraft because the draft height on that pump wasn’t high enough and they failed to do the proper job. Upgrade to the next Facet pump with a higher draft measurement. This has fixed about a dozen planes with pressure problems. Draft height is important between the fuel and the pump mounting location.

Hi Roger,

Always learning., had to look up "Draft height"  

Not quite sure it's exactly the same but I think we call it Suction Lift or Self Prime Height - the height from the source liquid surface, to the pump. 

Discharge Lift -  from pump to liquid discharge point/or surface, if pumping into the bottom of a tank. Most just talk about the total lift, expressed as Lift - being from source to discharge/surface of liquid in tank.

I checked out the Facet web site/specifications https://facet-purolator.com/specifications/. A random sample has a significant Lift (in inches) difference between pumps.

I placed my Facet pumps (Boost/Auxiliary & Transfer) as low, in my fuselage, as possible. The idea being that they are close to/below the lowest point of my wing tanks, so always primed (as long as there is fuel in the pipes) - no Draft required.