Hi everyone. I am the guilty party that has been rebuilding these pumps. I work at Then And Now Automotive. I had a ringing in my ear and followed it to this forum. Truthfully, I got here from a link that Mike Meyer sent me. I just thought I'd check in and let you guys know that I do exist.

Welcome Mike, Glad to see you found your way here, I got your email yesterday thankyou for getting back to me so quickly, once the sun comes up I'll measure that large brass nut that holds the one way valve for the fibre washer size.
Regards
Mike

Should be 1 1/4".

"Mike-Casella" wrote:

Hi everyone. I am the guilty party that has been rebuilding these pumps. I work at Then And Now Automotive. I had a ringing in my ear and followed it to this forum. Truthfully, I got here from a link that Mike Meyer sent me. I just thought I'd check in and let you guys know that I do exist.

MIke, Nice to meet you. BTW, I am sending my CAT22 fuel pump to you today for rebuild. Have seen and heard nice things about your work. Ray

I've been chatting with Mike at Then and Now via email the past few days about these 22 fuel pumps and he comes across as a great guy who is happy to go the extra yard, I'm hoping when he get's a chance he introduces himself here and what they do at Then and Now because it seems they offer all kinds of useful services like hand making steel backed rubber mounts for engines and transmissions, like the one's I needed to make for my 2 Ton track frames a year ago, and he said yesterday he was rebuilding a oil pump on a 1922 Maxwell, so it's not just making kits and rebuilding Stewart Warner fuel pumps that fills in his day.
Regards
Mike

I'll be watching for it Ray. Thank you.

I'll see if I can put something together showing some of the unique things I get into here at the store. You'll have to give me a few days to do it, we're going thru some miserable weather here on the east coast, and the internet connection is on and off.

Here are some before and after pictures of Ray's fuel pump. This pump is not made out of Bronze like most of the Cat pumps, but it is still an original piece. This was made during the time that AC was in the process of taking over Stewart Warner's fuel pump business. This one is entirely cast aluminum. Aside from the aluminum cast body and fuel section, many of the internal parts are very different from the Stewart Warner bronze pumps.

Before



After


Before


After

"Mike-Casella" wrote:

Here are some before and after pictures of Ray's fuel pump. This pump is not made out of Bronze like most of the Cat pumps, but it is still an original piece. This was made during the time that AC was in the process of taking over Stewart Warner's fuel pump business. This one is entirely cast aluminum. Aside from the aluminum cast body and fuel section, many of the internal parts are very different from the Stewart Warner bronze pumps.

Before

After

Before

After

Mike, looks great. thanks for the post. I'll call to settle up. Ray

Very nice work Mike, thanks for the photo's, I didn't know that AC took over Stewart Warner, I mentioned to you I have two AC pumps here and two Stewart Warners and other than the fuel bowl filtration system, one being small discs in a two stacks and the other being a fine mesh screen, I can't see a lot of difference in them and I've wondered if it was a Cat design built by both companies at the time.
Regards
Mike

Here's a little history lesson on these Stewart Warner pumps.

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The Bronze Cat pumps were first made by Stewart Warner in the 1929 - 1932 period. In 1932 Stewart Warner lost a patent and copyright suit brought against it by AC Spark Plug, maker of AC fuel pumps. AC won, and along with damages was awarded all Stewart's contracts to supply pumps to car, truck, equipment, and engine makers, and the entire Stewart factory and all tooling and rights to it.

While that took Stewart Warner out of the mechanical fuel pump business, they remain suppliers of electric pumps and other instruments into the present day.

As soon as AC could, they replaced the Stewart contracts with their own, and the Stewart pumps with AC designs to fit the same applications. Original Stewart pumps would say "Stewart Warner Traffic Tested" on the fuel cover. By 1934 there were effectively no Stewart pumps being made with one exception - Caterpillar. Either their contract with Stewart had been too strong to break, or the quantity of pumps involved was valuable enough that AC continued until about 1940 to supply a Bronze pump to Cat made on the Stewart tooling, while other AC products were there own zinc die cast castings. The original Stewart tooling was changed to say AC and AC part numbers were applied in place of Stewart ones.

The Cat pumps therefore occur in several versions;
All Bronze with Stewart number castings.
All Bronze pumps with Stewart castings with AC numbers.
Bronze top (fuel cover) pumps with die cast body section.

Because there were running changes in pump design, that influenced the parts required, but not the fit of the entire pump to the application, AC separated pumps into application groups. In Cat there are 3 different groups, and within each group, there are 4 to 5 different part numbers, and with consolidation, we have managed to get the number of kits down to 3.

There are a couple of these Bronze pumps that aren't very forgiving when it comes to rebuilding them yourselves. One of the more difficult parts on these pumps has to do with the pull rod that the diaphragm is attached to. It is a rather poor design that in my opinion, should never have been used in this application. I saw an opportunity to improve on the design, and took it upon myself to re-design the pull rod. It's not something that I can include in a kit as of yet, so for now if your pump needs one, it would be better to send the entire pump in for rebuilding.

Another area of misery has to do with the outlet valve. As we all know, moisture and thin metal don't get along very well, and the loser always seems to be the metal. There is a thin piece of metal with three legs that are held into the underside of the large hex nut in the fuel section by a tiny bent over edge. Under that piece of metal is a spring, and a hexagonal shaped disc. If the metal is subjected to moisture, then rusts, then breaks, you're in trouble and the rebuild project comes to a screeching halt. This problem is being looked at to see if I can come up with a solution.

I'm going to leave you with this info, but don't fear, I'll be back with some more stuff to ponder....

Mike