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I'll let you all troubleshoot this one.
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Posted by The Red on February 23, 2000 at 06:19:18 from (206.246.187.2):
Never mind its a JD 4400 combine. Never mind it has a GM 292 straight 6 engine. Just think of it as one of my Farmall Hs with an electric fuel pump. I opened the fuel strainer valve and fired it up yesterday after sitting since Dec. 9 out in the cold. I shot some starter fluid in the carb. and it roared to life on all 6 cylinders in less than 4 cranks. I was pleasantly surprised to say the least! I let it warm up for about 10 minutes, raised the grain table and ran it up and down the lot re-positioning it so we can get a backhoe in there. Once I started moving it, it began to sputter for a good 20 seconds then die. There is 15 gallons of gas in the tank BTW. By the time I climbed out onto the engine deck, spray some starter fluid in the carb and re-cranked, she would start right up smoothly for about 2 minutes, begin sputtering again for a good 20 seconds and die. I did adjust the carb last time I ran it and it ran nicely for 30 minutes. Note that last time I ran it I moved it only 10 feet or so. After a couple of times running 2 minutes, then sputtering and then dying, I called it a day. As I was shutting off the fuel strainer valve, I noticed a bunch of green crud in the glass fuel strainer bowl. The sputtering is exactly how my F20 sounds when I shut the strainer off and let it die on it's own. Now below is what I had done to this green bean eater since early November. Flushed the fuel tank with 15 gallons of gas. A lot of green varnished gas came out in the first 5 gallons of flushing. New fuel strainer assembly, new gas line between the fuel strainer and the new electric fuel pump. Original line between the fuel pump and the rebuilt carburetor. New points, condensor, distributor cap, plugs and plug wires. The old fuel strainer was plugged with "playdo" type of 7 year old varnished gas. Now note this. The electric fuel pump is a transistor type and gives out a distinctive chatter. When I started having problems, it was sounding muffled. My analysis is that I need to remove the fuel tank and have it flushed which I should have done while I was rebuilding this. I think the fresh gas in there is breaking up some varnished gas in the bottom of the tank. I will next time unhook the fuel line at the carburetor and make sure fuel is flowing through the old line OK. I could possibly have a partial block in that line. The engine was too hot to try that yesterday. This is a great board (biased ain't I) so I thank you in advance for your opinions.
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