Rotax booster pump

[themagus]

Hi All,I wonder if anyone can tell me if an electric fuel pump fails ?will it still flow fuel.My setup is in a Wasp with a 912 100hp.Was thinking of putting a facet posi flow or interrupter type back up pump(max press 4psi).The Rotax manual does show a bypass around a booster pump but this complicates the plumbing if its not needed with these pumps (does have a cube facet at present,but its very noisy) Many Thxs

 

 

[facthunter]

A positive displacement pump doesn't appeal to me, in this application . A centifugal type which just increases pressure would seem the better choice as it will bypass easily without involving any valves when it is not operating. Nev

 

 

[Guest Maj Millard]

The facet cube pumps do well and pass full fuel when off. 4 Psi is good, you don't need more or you will overpower the carb bowl floats. I previously had a german 'Peirburg' rotary pump fitted for a while, but about once an hour it would interupt fuel flow for a few seconds. On further research it appears that this pumps' rotor can stop in a position that may cause some restriction to flow, so a by-pass is recommended with a one-way check valve. Out came the Peirburg, and back in went the facet.

 

No dramas with the Facet, if yours is too noisy, relocate it. I do in fact like to hear mine as I know it's working....Rotax recommended fuel pressure supply range is 2.2si to 5.8psi, do not exceed..........................................Maj...

 

 

[themagus]

Many thxs for the input---I was thinking maybe I should stick with the cube rather than a rotary type pump which sounds like it would need the bypass plumbing for added safety.Thxs

 

 

[Guest Maj Millard]

Your welcome....a good rule for fuel systems, keep them as simple as possible !!.....................Cheers Maj...