Fuel Pump Part Numbers - T337F

pwolfehagen · #1 02-10-23, 10:39 AM

I have a bad pump on the front and figure the rear is not far behind. I would like to find an overhauled pump to install up front now. And then have the bad one rebuilt to be installed on the rear at a later date.

The Cessna parts catalog calls out 629373-1A1.
Textron says this number has been superceded by 655921-2A2.

The actual pumps installed on the plane now are 634263-1.

Does anyone have experience with these part numbers and what will actually work?

Learjetter · #2 02-10-23, 01:45 PM

According to Mikes Aircraft Fuel metering service and QAA in Tulsa…they’re all the same pump on the NA 337s. Expect 4 weeks and an AMU for overhaul. I can recommend Mikes shop…give them a call and ask about 337 fuel pumps.

Frank Benvin · #3 02-10-23, 07:28 PM

One for sale on ebay

https://www.ebay.com/itm/13434467146...3ABFBMxpPk3cdh

wslade2 · #4 02-10-23, 09:42 PM

Sometimes the shop might have an existing pump already rebuilt on the shelf and you can do an exchange if you’re in a hurry.

I have had good luck with Aircraft Accessories of Oklahoma.

pwolfehagen · #5 02-11-23, 12:16 PM

Quote:

Originally Posted by wslade2

Sometimes the shop might have an existing pump already rebuilt on the shelf and you can do an exchange if you’re in a hurry.

I have had good luck with Aircraft Accessories of Oklahoma.

Yeah, went with A A of Oklahoma. They did not have one on the shelf but said they could rebuild mine with a 5 day turn around. Sent it off yesterday.

I was not able to locate an exchange anywhere. Prices ranged from $1100-$1400 for the rebuild. Turn around times varied from 5 days to 6 weeks.

B2C2 · #6 02-13-23, 08:48 PM

Hi, I had to replace both pumps in my 1969 T337D. It turns out Weldon makes a brand new pump for my aircraft. the PN is 18000-B 28V and it is $885 on aircraft spruce. I'm not sure about the PN for yours but If you haven't done this yet I would recommend going this route. Mine both work very well.

pwolfehagen · #7 02-15-23, 09:02 AM

Quote:

Originally Posted by B2C2

Hi, I had to replace both pumps in my 1969 T337D. It turns out Weldon makes a brand new pump for my aircraft. the PN is 18000-B 28V and it is $885 on aircraft spruce. I'm not sure about the PN for yours but If you haven't done this yet I would recommend going this route. Mine both work very well.

Thanks B2C2, but those are the electric boost pumps. I was looking for the primary, gear driven injection/metering pump.

B2C2 · #8 02-17-23, 10:59 AM

Okay sorry about that. I didn't look up the part numbers but the cost was similar to what I was quoted for rebuilding the electric pumps. My A&P was surprised to hear that you could buy new ones for less than that, and they seem to work fine so thought Id pass that along.

Joes · #9 02-17-23, 08:29 PM

the designation of t337f would indicate a turbo engine, if so the turbo pump uses the upper deck pressure to determine the amount of fuel to the injectors. N/A is gear driven. Two different pumps. If you find an older pump during the rebuild they will bring it up the the latest revision, but check with them before. QAA has done two for me in last 12 mo.