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Hello, Jon Was going to say good morning, but I think it's probably near midnight where you are (grin)! You have a truly classic tractor. the FE35's have the reputation for hard starting, but they run almost forever. And you can still get parts, world-wide, at reasonable prices. A remarkable record for a 40 year old machine! I'm guessing that you have the 4 cyl Standard 23C in your tractor. In our similar unit, this problem was caused by a dirty injector, missing intermittently just like a dirty spark plug. More pronounced at idle. Isolated the culprit by cracking the injector feed line retaining nuts a bit, one by one. The loosened line caused a miss, just like removing a spark plug lead. BIG SAFETY TIP: when doing this, be very careful to avoil fuel spray. That high pressure fuel can penetrate like a hypo needle, and the results can be fatal! Wear safety glasses or a face shield, a heavy jacket, and gloves. Loosen each nut just a hair - until you hear a change in sound, not enough to get a fuel spray. The culprit injector went to our CAV depot, and after about $60 CDN, worked great. There are three fuel filters in the system: the glass sediment bowl and screen on top, and two replaceable filter cartridges between the bowl and the injector pump. We change at every second oil change, or annually. Cheap insurance. Had some water in one once, cut the injector pump shaft off. Cost a cool $1000. If you're getting full power, the filters are not restricting fuel flow, but if they haven't been changed in the last year, I'd strongly recommend doing it. The system should be purged of air after the change - there are two 5/16" head bleeder plugs on the side of the injector pump. With a pail on the ground to catch fuel, loosen the top one, and pump fuel through the system with the toggle lever on the fuel pump until the air bubbles stop and clear fuel comes through. Takes a while - you have to fill the two filters. Tighten the top plug, loosen the bottom one and repeat. Take your time and get ALL the air out. If you don't, the tractor will start, then stop from lack of fuel, and you have to bleed the injector lines - a LOT more work. Hope this helps. Good luck!
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