REFLECTOR: Dukes 2 speed pump

[Brooke Wolf]

Thanks for the info Scott.

The word I got from Cirrus is that they run their TCM 550N's with a  
Dukes pump that produces 4-6 psi/19 psi.  I can't verify this  
information but I am pretty confident of my source.

My knowledge of the specifics of the 550 is quite limited, however it  
is my understanding that they HAVE to be started with the pump on in  
the high pressure mode.  After that, the pump is turned on only in low  
pressure during critical phases of flight as a backup to the  
mechanical pump.  I am told that the engine will not run with the pump  
in high as it gets "flooded".

Anybody else want to chime in?

Brooke


>
> From: Scott Derrick <scott at tnstaafl.net>
> Date: December 16, 2010 4:16:27 PM EST
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: Re: REFLECTOR: 2 Speed Dukes Fuel Pump
> Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org 
> >
>
>
> I used to know that as its the same for my 520. The low pressure is  
> between 16-19 psi, The high is think was about 28-30...
>
> It's a b**** to get the electrical backup to work in flight because  
> you have to change the mixture with any power/rpm change.
>
> I opted to go automotive(racing) single pressure 16 psi carbon vane  
> pump, as that is the pressure you use for an in flight mech pump  
> failure.
>
> I think I have the data on the Duke at the airport in the overhaul  
> manual.  I can check it next time I'm there if nobody else chimes in.
>
> Scott
> -------- Original Message --------
> Subject: REFLECTOR: 2 Speed Dukes Fuel Pump
> From: Brooke Wolf <bwolf1 at tds.net>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Date: 12/16/2010 05:01 AM
>
>> Does anybody know the pressure ratings for the High/Low positions  
>> of the
>> 2 speed Dukes fuel pump used in TCM-550 installations?
>>
>> Thanks
>>
>> Brooke

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