D2 Pony Motor Fuel System

I am 79 years old and have been an ACMOC member for almost two years now. I am helping my son(52) with a Cat D2 that he acquired about two years ago and we need some help.

The D2 is s/n 5U9768 with 877 hours on the meter and looks to be in very good condition and runs extremely well.  The machine came to us with a broken sediment bowl on the Pony motor.  The previous owner removed the sediment bowl assembly and jury rigged an inline filter in place of the original assembly.  We have the original parts including the broken bowl.  My son wants to return the components to their original installation but we have been unable to find a replacement glass bowl.  Help here would be appreciated if anyone has any idea how we could locate one.  Also, we are not sure how the original sediment bowl assembly was physically mounted.  The assembly is located on the right side of the D2 under the Pony motor gas tank (pictures attached). We have been unable to find a D2 locally with this configuration for comparison .  The mounting location seems to vary from machine to machine.  If someone out there has one like ours, I would sure appreciate some close-up pictures showing how the sediment bowl is mounted to the D2. 

As I mentioned earlier, we have been unable to locate a replacement glass bowl. I read somewhere, ACMOC website I think, that Cat some time ago had offered a metal replacement but that does not seem to be available any longer.  I was thinking about turning one out of a piece of aluminum round stock if we cannot find a glass one.  Help here would really be appreciated. Thanks in advance.

Hello Larry - I am sure others will chime in on this thread - do a google search - "glass sediment bowl fuel filter" - As memory serves me - the fuel sediment bowl assembly was threaded directly into the bottom of the tank and had a valve to turn on or off. It was and is best practice to fill the carburetor bowl, shut off the fuel, start the engine and then turn on the fuel, once you have the diesel running, shut the fuel off at the tank for the starting engine. Let it run out of fuel! Saves lots of issues down the road. -- cts

you were able to buy aluminium replacement bowls but that defeats the purpose somewhat to see the crap caught in it.

your better off with the generic filter its is finer filtration. get one for a lawnmower they are smaller and not as obnoxious. also if they get broken just about any small engine shop has them and they are cheap.

Brillman I think has exactly what you are looking for. I can’t find my book. You can order it

I have always stayed away from in line filters because they were made for fuel pump systems. Now I am using filters made for ATVs which are gravity systems. That does not look like a bad filter you have there, I do not like the loop in the hose. On my D4 there was so much rust in the tank I changed to plastic tank, inline filter, and plastic valve with fuel hoses and clamps. No more problems. I kept all the original parts of course.

Larry, I have 5U1164, and just re-made all the pony fuel lines. I also did not have the original sediment bowl so I used one that is commonly available for small sized tractors such as a MH Pony. These are similar in size to the original. I have attached photos, and you will see that I did not locate the bowl in the original location, primarily for ease of access. I am personally not a fan of rubber lines, but that's just me. Keep in mind that there is (or should be) a filter screen in the valve on the left side, check that. Mine had disintegrated so I made a new one from a similar type screen filter for a Ford 8N.

And another

Anything that works is good with me. But I think it really needs to have a shut off. Nobody wants to fill the crankcase full of gas. If run without a shut off it will happen someday.

I have neighbor that needs pony fuel system parts every few years. He got one of the metal fuel bowls last year I think it was. You most likely found a parts person that had not had a call to for anything this old before. Even with a old part number you need to add 0 to get to the correct number of digits for the computer.

All kinds of arrangements work, some look better than others. Bear in mind there is very little elevation in the system and air locks are very frustrating.

That’s right Wimmera. With a full tank of gas it work fine. Let it get about half down and if that filter isn’t just right or even if atmospheric pressure changes you are out of luck. So this man is absolutely right in wanting that area of his machine exactly right. He doesn’t want a no go

That is a really nice job there Kurt.

Mine is setup with rubber hose, plastic shutoff valve, and then the factory second shutoff valve with an internal screen. I hate it, and want to hard-pipe it as close to original as I can. In my research you have to get lucky to find an original sediment bowl/shutoff. The factory fuel lines/fittings are unique, but the ferrels are still available from Cat to solder onto metal tubing for connection to the factory valve. Again I really like Kurt’s job of adapting in an available sediment bowl/valve and just very well might do that myself.

I do have a picture of an original that I took at Veercat’s last spring…