Fuel Boost Pumps

Hi, Just a bit of FYI. The C337 maintenance manual says to replace these pumps every 10 years. Here in Canada, if you fly them commercially it's a requirement. Privately, it's at the owner's discretion.

[sunnysky]

I have a 337G with Dukes auxillary pumps.
There was a requirement to replace these pumps because of broken vanes which could then go further into the fuel system and cause the mechanical pump to stop working, then engine failure !!

[billsheila]

I was aware of that Service Bulletin (note it apparently never reached the level of an AD). Any new pump was apparently supposed to be labelled to indicate it had the new type of vanes. I couldn't find these on my pumps. In the end, even though the old ones were working fine, I opted to replace them for the peace of mind.