Man I really im banging my head against the wall with this tractor and could use some guidance. My grandfather gave me his old Case 448 18HP Onan garden tractor as I thought it would be a great fixer upper. So far I replaced the following...
- New Battery
- New Plugs, coil and spark plug wires
- New condensor and points
- Rewired the entire wiring harness
- Drained and replaced all fluids and oil
- Rebuilt carb and diaphragm/fuel pump
- Replaced fuel line and fuel filter
When I first fired it up, it ran great for about 30 minutes... then fell flat on its face. It wont start unless I choke it. Runs for a few seconds and stalls out again. I have taken the carb off about 3 times, cleaned it, rebuilt it. The last time I took it off, it ran good for 20-30 minutes and same behavior.
I checked double checked the fuel filter and even added a mechanical inline fuel pump to see if that would help, same behavior.
Now heres the thing...If I slowly drip fuel through the top of the carb, it stays running. My thoughts are either 1) The float is slowly deteriorating and clogging the jets or theres dirt in the fuel line or tank somewhere or 2) the fuel pump isnt working right.
Honestly, I rather buy a new carb off ebay for $40 rather than spend $50 on a new float and that NOT be the problem. I noticed that the B48M motor came with like two other carbs that year, but they didn't include an attached fuel pump. Could I replace mine with one of those and use an inline fuel pump? Or would that pump too much gas into the carb and cause issues?
Assistance would be greatly appreciated!