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If I add an electric fuel pump while keeping the wobble pump, would the fuel pump start the engine or would I still have to pump the handle on the wobble pump?

I was told I could add a boost fuel pump, but would still need to keep the current wobble pump and fuel selector. If I did add the electric fuel pump, would it start the engine without having to manually pump the wobble pump? Also if I add an auxiliary tank, would I have to change out the wobble pump to add a third fuel selector valve?

Model: Bonanza A35
Aircraft Serial Number: D-1884
Posted 6/6/2022 - 2 months ago
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Replies Sort

Glenn,

Years ago there was an STC to add an electric boost, but it is no longer available to my knowledge. The STC instructions allowed you to install a spacer inside the wobble pump that deactivated the manual hand pump, but not remove the wobble pump assy. This is because the selector portion of the assy is still used. We still see many wobble pumps in for repair annually that do not have the STC. We can repair your assembly if needed.

As for the Aux tank, most tip/aux tanks are typically plumbed into the main tanks which allows you to keep your original selector.

Best regards,

Kevin Allen
Aircraft Accessories International
770-703-4316
kevin@aaiair.com
www.aaiair.com
FAA Repair Station VJYR666L
EASA Repair Station 145.6632
We overhaul and exchange hard-to-find aircraft accessories so you can get back to flying

Posted 6/7/2022 - 2 months ago
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The wobble pump I have is very hard to pump. Could it be exchanged or overhauled? We had an issue after stopping for 10 minutes to fuel, that it was very difficult to start with the pump. Also hard to tell on the selector when you are precisely on the left tank.

Posted 6/8/2022 - 2 months ago
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Hello Glenn,

It sounds like there is worn parts and/or corrosion within the pump and valve. We do offer repair, but parts are getting harder to source for these if we do find excessive wear and corrosion. Your P/N should be 35-924230-1, give us a call to discuss the process.

I look forward to hearing from you.

Best regards,

Kevin Allen
Aircraft Accessories International
770-703-4316
kevin@aaiair.com
www.aaiair.com
FAA Repair Station VJYR666L
EASA Repair Station 145.6632

We overhaul and exchange hard-to-find aircraft accessories so you can get back to flying

Posted 6/8/2022 - 2 months ago
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Adding the Dukes electric pump is a modification that could serve well in the case of an engine driven fuel pump that quits while in flight. One good modification is to replace the original "plunger" type fuel pump that came with your A35 V tail and install the later "lever" type pump. That modification is approved in the A777 TC under item 111 (d). The lever type pump is a much better setup than the "plunger" type pump. Salvage yards would have this "lever" type pump.

Regards, Lew Gage

Posted 6/8/2022 - 2 months ago
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Approved by Bob Ripley
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Does anyone know where I can get the Dukes electric pump and what the STC is?

Posted 6/12/2022 - 1 month ago
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I purchased the STC from Randy James a few months ago which consisted of the necessary drawings and engineering paperwork and a letter of authorization to install on my aircraft along with a kit consisting primarily of tubing and brackets. I bought a core and Ebay in the $400 range and had it converted to the STC required part number for around $250. From memory I recall that any old two wire pump would do for a core. There were many other necessary parts that I purchased directly from Aircraft Spruce fittings, o-rings, and mounting hardware mostly. I have Randy's contact information. If you PM me I'll be happy to share it with you like.

Posted 6/13/2022 - 1 month ago
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Glenn,

If you are able to obtain the paperwork and move forward with the install, give us a call and we can supply the Fuel Pump if you wish. We should have one in stock.

Best regards,

Kevin Allen
Aircraft Accessories International
770-703-4316
kevin@aaiair.com
www.aaiair.com
FAA Repair Station VJYR666L
EASA Repair Station 145.6632

We overhaul and exchange hard-to-find aircraft accessories so you can get back to flying

Posted 6/15/2022 - 1 month ago
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Hi Glenn - looks like you received some good technical advice here. I have an electric fuel pump on my F35. Typically use the wobble pump when starting, but exercise the electric pump occasionally on start up. Both work and as Lew mentioned, if the engine driven pump fails in flight, the electric pump will be your best friend. According to guys who have done it, continuously pumping the wobble while executing an unplanned landing is not fun.

Posted 6/21/2022 - 1 month ago
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If I add an electric fuel pump while keeping the wobble pump, would the fuel pump start the engine or would I still have to pump the handle on the wobble pump?