This Piper document KIT 760-520 is for replacing the Bendix boost pump with the DUKES electric fuel boost pump used in the fuel injected PA24-250 and PA24-260.

Photo - of the mounting bracket p/n 28080-000 included in Piper kit P/N 760-791. This bracket assembly p/n 28080-000 is for the 400 Comanche when replacing the Bendix fuel pump. Specificlly this is the 400 bracket but can be used also for the 260 pump replacement as above in kit P/N 760-520. An owner produced part; you ask and I make it for you - $125.00.

Also see the link "Electrical Misc" where you will find information on other gauges and sender units.

Service Spares Letter 406 covers fuel gauges and sender units.

This section won't cover those items easily available such as the engine-driven pumps and boost pumps.

Fuel quantity indication system - 90 gal singles

• Above is a cute photo showing the resident mouser and "helper", and secondarily a selector switch assembly that really needed the treatment that I offer. Read the article Diagnosing fuel selector switches

How can anyone deal with a mess like this? Click on the photo for another example.	After repair; much easier to deal with. Click for a detail photo

• Singles
• Customer comments: Lee Hussey

• System with a single gauge in the panel; 90 gallon & 400s. $319.39 complete; add $25 for the adapter plate refurbish on the 400 [exchange only on the plate].
• Diagnosing fuel selector switches

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  Fuel quantity indication system - 90 gal twins

• Brochure for the twin Comanche fuel indicating system as pictured above.

  • Standard indicator system - $155.00

• Panel gauge calibration - see appropriate SM section; twins and/or singles. This procedure involves some trial and try again!
  • photo #1
  • photo #2

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Fuel selector valves

The Hoof brand valves are installed in the 90-gallon singles. I have no idea what the differences are between the early and late versions.

• Hoof Fuel Selector Valves. These are not difficult to reseal per the service manual procedure [note - this is from an older SM however the content is the same as the current version. The older manual has clearer material to scan].
  
• New Hoof valves were available in the parts department; none remaining at this time.

• Here is a hint for installing the shaft o-ring; wrap the shaft in teflon tape and slide the properly lubricated o-ring into position.

The Airborne brand valves are installed in the Twin Comanche and the 400 Comanche.

• The Airborne brand valve for the 400 Comanche is difficult to locate in servicable condition. If yours becomes difficult to operate I suggest you have it serviced immediately. Do not use a pliers or vice grips on the shaft to rotate, that will render the shaft junk and you are out of luck!

• The Airborne brand valves for the Twin Comanche supposedly will be in production again from the manufacturer, a stainless steel version. Check with Webco Aircraft for repair of these valves, they have FAA approval for the process.

Fuel level sender units [aka fuel transmitters]

New fuel level senders are available from Piper;

see Piper Service Spares Letter 406 for details.

Read the article Test and Refurbish Procedure for fuel level transmitters

Main and Auxiliary transmitters ready to install.	Fuel level transmitter sealing and hardware kit.

5 each stainless screws and sealing washers, 1 rubber gasket, grounding braids with knife terminals and PVC sleeving to insulate, ty-raps, and grommet for the fuel adapter plate. A whopping $7 plus shipping. Specify whether you have the AC type or the Rochester type transmitter; the Rochester uses longer screws. The kit for rebuilding the transmitters is $10.00 which includes a few more components.