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If you have a Baron or Travel Air with fuel
injected TCM engines, it's likely that you have a 24V-28V pump manufactured by
Dukes, Inc.
Bonanzas are also fitted with Dukes electric fuel pumps.
Here's a Dukes 4404-00-7 fuel injection Boost Pump 24V
Here's their contact info if your pump ever
needs servicing or overhaul:
Dukes Inc
9060 Winnetka Avenue
Northridge CA 91324-3235
Tel: (818)-734-4370
Fax: (818)-734-4372
A Beech Lister reports an overhaul ran him
about $500 a few years ago and his pump was returned within a few days. We are
now hearing price quotes for overhauls of nearly $1,000 for these pumps! Heaven
help us! 
HERE is a pdf from
RAPCO on their pump overhaul
Here is another pirep on Dukes service from
Beech Lister Mike T.:
A boost pump on my Baron failed late Wednesday afternoon.
Someone on the list suggested I call Dukes. I did and reached a cheerful and
competent woman who explained Dukes could overhaul my pump for $550 (with a
five-day turnaround) or I could go the OH route for $600. I took the second
option, and the replacement pump was shipped the next morning. It couldn't have
been any easier.
(Surprisingly, Dukes' prices were less than the few
independent shops I had checked, although in this particular instance I wasn't
squeezing my pennies very hard; the aircraft wasn't flyable.) Highly
recommended, as the movie reviewers say.
Here's another source for overhauled Dukes
Pumps from Baron Owner and IA, Stuart S.:
Chance Aviation
Ask for Norm Chance
Stuart believes they were overhauled by Fleet
Support (RAPCO).
Here are some service bulletin documents and
overhaul kit numbers. Note the requirement to convert your older pump to
nylatron vanes. Click for full size images:
Weldon Fuel Pumps
(fitted to some Bonanza Models)
Repair Source Pirep
Bob Bejni
RLB Accessory Service
630 543-9213
971 N. Babbitt Ave
Addison, IL 60101
Weldon Authorized Repair Facilities
HERE
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Dukes
Fuel Pump Info