Auxiliary or Boost Pumps in 2024

[YankeeClipper]

I haven't seen a thread about this since 2010, and wondered if someone might know where to source a pump for a 69 Delta model.

First thing I'll note is that when I look at the parts manual, I see a cryptic figure index #20 which says Pump-Auxiliary fuel --- Attaching parts. Yet it points to what looks very much like a pump in the picture, and that number 1426033-3 matches what was said in the 2010 threads.

I've had no luck trying to reach any of the named or linked providers there. I see a lot of chatter about the 18000-b which is (probably) readily available from any number of Weldon pump resellers.

Here's the rub: the PMA does NOT name any model before Echo, of any type. So my IA said he can't put that in, because god forbid an accident occurred--even if unrelated to that part if investigators took notice of it he'd be in hot water.

Know where to either find a PMA for a Delta model, or just a reseller with the right part number?

[RandyArizona]

You may find it easier, and more cost effective to "find a new tech."
First question, I have... HAVE YOU looked at/touched the pump in the aircraft itself? What does it look like?
Any numbers on it?
Next: A search is quickly done:
the pump 1426033-3, has been replaced by: This product has been replaced by this part number: C291504-0201
The C291504-0201 has been replaced by: XC18000-B Or in the aircraft spruce website:
Cessna Single-Engine & 337 Aircraft 18000-B C291504-0201 Fuel Boost
08-07083
$916.00

Unless you have angered your mech tech, I am at a loss as to WHY he has dropped the ball here?!
Best of luck in finding a new mech, or finding a new pump..
Regards,
Randy

[YankeeClipper]

He didn't drop the ball--he said new is difficult to find but he could send out for overhaul with about a 2 week turn around. Then I started to look around for new. I think I still agree with him.

I saw what you refer to there, but when you go to the eligibility list, it does not include models before Echo. Even though Spruce and others say that 18000-(x) replaces 291504, it only means it replaces it where the 18000 has a PMA. I went on the FAA site and saw that it too only mentions Echo onward. I wondered if it "really mattered" since hey--same old part--why not same replacement part? Nope. If it ain't PMA'd for your aircraft it ain't legal. And while we all know it "won't matter" in any practical sense, again, it could become a liability some day if the FAA ever found their noses in my (likely wreck of an) aircraft. I called both Textron and McFarlane (who also carries the Weldon 18000) to ask if I can just use the 18000, and both said not legally.

[RandyArizona]

Well then, it appears you have your answer.
Why did you ask, if the answer you accepted, (and evidently called Textron and McFarlane) got their answer?
My first two questions still stand.
Have you seen this pump? Touched this pump?

Aircraft spruce page, weldon pumps.. listed at the top is PMA"d pumps,
17 boxes down is :

Cessna Single-Engine & 337 Aircraft 18000-B C291504-0201 Fuel Boost
08-07083

So, PMA'd, and listed for 337 aircraft.... Part number is correct, and if you call Weldon, I am pretty sure they will tell you it is the correct number.

OR

Don't take my word for it... Ask Weldon.

640 Golden Oak Parkway
Cleveland, Ohio 44146, USA
Info@WeldonPumps.com
PH: 440-232-2282

FX: 440-232-0606

Regards,
Randy

[RandyArizona]

I just thought of one other thing....
YOUR maintenance manual, parts manual is up to date? Correct?
Latest and greatest version?
Perhaps a newer version has the correct part number listed, or lists a superceded part.

Regards,
Randy

[YankeeClipper]

Originally Posted by RandyArizona

Well then, it appears you have your answer.
Why did you ask, if the answer you accepted, (and evidently called Textron and McFarlane) got their answer?
My first two questions still stand.
Have you seen this pump? Touched this pump?

Aircraft spruce page, weldon pumps.. listed at the top is PMA"d pumps,
17 boxes down is :

Cessna Single-Engine & 337 Aircraft 18000-B C291504-0201 Fuel Boost
08-07083

So, PMA'd, and listed for 337 aircraft.... Part number is correct, and if you call Weldon, I am pretty sure they will tell you it is the correct number.

OR

Don't take my word for it... Ask Weldon.

640 Golden Oak Parkway
Cleveland, Ohio 44146, USA
Info@WeldonPumps.com
PH: 440-232-2282

FX: 440-232-0606

Regards,
Randy

Well quite a lot transpired between 2:47p and your response.

I called Weldon during that time, for example, and they said that they had no PMA for pre-echo. In fact, the way they concluded that was by both of us browsing together to the FAA site where the PMA documents are published. We found eight of them, none of which mentioned anything before the echo models.

I have not seen or touched the pumps myself.

I saw the box you mean that only says 337, but if you click on the link for the part on that same line (for further details) it once again only lists Echo onward.

Good question about the parts manual... I'm still new to a lot of this; where can I find an updated version?

[Frank Benvin]

I bought my pumps for my 1967 337b from https://aircraftaccessoriesofok.com/

Duke 4140-00-15 This was the physical part # on my pumps Luckily I had a couple spares from a 1967 337b parts plane

They had them in stock but you must return your cores There is a core charge which they return if your cores are good I had some extra pumps kicking around so I sent them in and they confirmed that they were good cores so i was never charged the core charge

I had to replace my pumps with an original the dukes the other pumps for the newer 337's are not certified for the older models

Pull the panel and see if you can see the part # on your pump

Hope this helps

Frank

[YankeeClipper]

Oh I know those guys...got a governor or two from them. Didn't think to call them for an overhaul of the pump though.

Thanks for the suggestion.

[SteveG]

After a cold flight yesterday my C337A has come down with a runny nose (boost pump overflow drip). I can't add much to the previous posts on this topic but... Repair or replace options now seem to be: Dukes overhaul at $1350 + $600 core, McFarlane (CJ Aviation) at $975 + $50 core or Weldon at $925 + $100 core. As previously discussed the McFarlane & Weldon pumps do not have the A thru D models included on their applicability lists. I'm just wondering if anyone has actually installed one of the non-Dukes options with the blessing of an IA or if everyone has eventually opted for the Dukes overhaul. It just seems crazy to pay $425 additional for an "overhaul" that no doubt reuses the same motor, housing, head casting, etc. such that all one is actually receiving is a reseal than to buy all new just to satisfy some obscure paperwork when all of the part numbers are interchangeable. I'm leaning towards the Weldon pump but if anyone has any experience with that solution I'd be grateful for your hard earned experience report. Or any further thoughts on the matter from others.

Thanks, Steve G.

[Frank Benvin]

Originally Posted by SteveG

After a cold flight yesterday my C337A has come down with a runny nose (boost pump overflow drip). I can't add much to the previous posts on this topic but... Repair or replace options now seem to be: Dukes overhaul at $1350 + $600 core, McFarlane (CJ Aviation) at $975 + $50 core or Weldon at $925 + $100 core. As previously discussed the McFarlane & Weldon pumps do not have the A thru D models included on their applicability lists. I'm just wondering if anyone has actually installed one of the non-Dukes options with the blessing of an IA or if everyone has eventually opted for the Dukes overhaul. It just seems crazy to pay $425 additional for an "overhaul" that no doubt reuses the same motor, housing, head casting, etc. such that all one is actually receiving is a reseal than to buy all new just to satisfy some obscure paperwork when all of the part numbers are interchangeable. I'm leaning towards the Weldon pump but if anyone has any experience with that solution I'd be grateful for your hard earned experience report. Or any further thoughts on the matter from others.

Thanks, Steve G.

See my post above You need to replace with the dukes with dukes The other ones are certified for the newer model 337's not our older 337's The fuel pumps in the older models are in the wings the newer ones are located in a different place the engine compartment if i remember correctly My mechanic told me to replace with the certified ones for my 337b I am located in Canada

[YankeeClipper]

I'll ask my IA tomorrow how we resolved. I don't recall breakfast, so...

[Learjetter]

One could use the grace in AC 20-62 and use the new pump in place of the old one. Just confirm same form, fit, function and that it’s a PMA’d article.

It would take a mechanic to deem it a minor alteration (logbook entry) or an IA to write it up as a major alteration (Form 337), or even get a field approval from the FSDO, depending on how conservative the owner is and how worried the mechanic is.

Personally, if it was mine, I’d call it a minor and go fly.


-LJ

[SteveG]

Dear Mr. Benvin, Thanks for the reply. I do understand where you are coming from however I do think Canada's maintenance engineers, as I believe they're known, and the regulations they operate under, are more restrictive than most. While it is true that later models relocated the pumps from the wings to a position closer to the fuel strainers, in the nose gear wheel well for the front and in the upper engine compartment for the rear, the pumps used are all the same make, model & part number. And so it escapes me why units PMA'd & STC'd to replace that part number should be rejected as unacceptable just because the early aircraft were omitted from the manufacturer's eligibility list. I've spoken with an IA who, although somewhat reluctantly, said that he could approve the installation so long as it involved matching part numbers or their equivalent. But I do not wish to cause him any discomfort unnecessarily.

Dear Mr. Clipper, Thanks. My short term memory is also measured in minutes, not hours or days.

I've not committed to a purchase as yet and so I remain interested in anyone's experience with any of the aforementioned pumps. The one I just pulled out has a date of manufacture of 5/6/1977 and so I suppose the Dukes has served a useful life although even 48 years probably only amounts to maybe an hour or so of run time. Given their limited use the motors would likely last forever, it's the seals that perish over time. And I believe that the rotor vanes have undergone a redesign so that may be a small improvement as well.

[SteveG]

Dear LJ, Yes, it's the form, fit & function argument along with compatible part numbers that I believe makes this PMA by other than the OEM solution acceptable. Thanks.