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Follow up: 350 with low carb fuel level

R

riverbend

Well-known Member
It runs better but no definitive answer to what the problem was.

Compared to my H, the 350 flows 25% more fuel through the carb in the same amount of time. The H must suck fuel out of the tank when it is working. I checked the fuel level with an open ended tube stuck over the drain fitting. When I opened the throttle it would suck air into the bowl through the tube and run just as poorly as the 350. Back to the ignition side.

The problem started last summer, it wouldn't idle once is was warmed up and would not restart once it died. Eventually it got so it would hardly idle and wouldn't take any throttle. Bad coil ? Subbed a coil from a good running car, same problem. I replaced the plug wires, plugs, cap, rotor, condenser, points (did look burnt but weren't that old), each in turn and nothing ever made a difference. Finally got the bright idea to 'look' at the spark with my timing light. Sure enough it was dropping out. Reinstalled the old coil and it runs fine, even idles when warm. Tomorrow I'm going to plow with it and see how it acts.

Greg
 
25% more may not be enough fuel flow. What you did on the H is either not a valid test, or is telling you that it is running on the bleeding edge of not having enough fuel flow for some reason. I'm not 100% sure on that, so hopefully one of the other kind folks here can validate or refute what I've said.
 
The H starts easily, runs great, pulls hard, plugs look good, doesn't diesel when shut off, etc. I don't think the fuel flow / level is inadequate. Attaching a tube to the drain was the only way I could figure to check the fuel level in the bowl. I was very surprised that it was as low as it was.

Greg
 
Level in the bowl should be looked at with a vinyl tube with it shut off. There will be false indication if running. Jim
 
Hi Jim,

Can you think of a way to measure the fuel level when the tractor is running ? Not that it matters but now I'm curious. I figured that the liquid would find its own level in the open ended tube. With the carb vent I didn't think that the vacuum would affect the fuel level any more than it normally does to operate the carb. Capping the tube seems like it wouldn't let the fuel in or out of the tube.

BTW, the tractor ran great today. Idled when hot, restarted when even the deck was warmed up.

Greg
 
With the air tube off the air cleaner to carb removedm, it should be about the same at idle. At higher speeds it might vary a 1/6". There is a bowl vent that is internal to the bowl casting. It has a small washer and a felt "fiter" in the bottom of the carb bowl. Make sure it is not plugged up. Regular felt from a sewing/fabric store is fine to use. jim
 
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