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. Fuel injected Bonanzas are also fitted with 12V Dukes electric fuel pumps and the earlier ones may use a Weldon pump.

Here's a Dukes 4140 Boost Pump

Here's their contact info if your pump ever needs servicing or overhaul:

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

NEWS FLASH 10/28/2012:

Dukes has appointed Quality Aircraft Accessories (QAA) the exclusive rebuilder/overhauler of their pumps. This has skyrocketed the price for overhaul and exchanges of these pumps to something reported on the order of $1,000 overhaul and about $1,400 exchange! See the Press release on this very sad news for us owners HERE

Do NOT DESPAIR! As of this writing enterprising Bonanza owner Spike C., has identified a viable alternative to what amounts (in my opinion) to predatory pricing on this key Beechcraft component.

Here is Spike's pirep on his find:

Here is the Aeromotors info:

Aeromotors LLC has an approved alternate procedure and their own parts for $400! WAHOO!

See their website and Dukes pricing HERE scroll down to see the Dukes PNs

Email: aeromotorsllc@gmail.com

On 3/25/2013 I spoke with Bob at Aeromotors and he confirmed at that time the 4140 Series Dukes pump repairs were indeed $400. However, the 4150 Series on the Baron (with the second stage solenoid) are $650.

Here is a pirep from Bonanza owner, Paul S. of NY:

Stay tuned to this page for possible reports of a Weldon Pump PMA'd alternative. Weldon pump pricing seems to remain a low cost alternative to the now VERY COSTLY Dukes pumps used as OEM in many of our Beechcraft.

Here is a picture of the 4150 Series Boost Pump in my B55

A note about boost pump removal in the wing - USE JACKS & TAIL WEIGHT to support the airplane while you open the inner gear doors with your manual crank (clockwise). This will allow you the access needed to effortlessly work to remove the pump. I suggest you not even think about cranking open the gear doors with the WOW (weight on wheels) since the nose linkage will likely come off "over center" lock and you risk a nose collapse or worse with you or your mechanic under the plane!

Here is an old pirep on Dukes service from Beech Lister Mike T. (before the "exclusive rebuilder selection". How things have changed for the worse for us users of the Dukes product ! :

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: