My 766 gas tractor is stalling out on me after mowing with a brush hog for 15-20 minutes. It runs great for 15-20 minutes then it acts like it's running out of fuel, almost stalling. It's not overheating. It doesn't misfire. Just loses power. The previous owner put an in-line fuel filter between the sediment bulb and the carb. I've replaced that and also replaced the coil wire but it didn't help. Someone said the fuel in the tank can be getting too hot - that sounds odd to me. I have no idea what to try next. Any ideas? Appreciate any advice (other than "junk it")
- Thread starter Jim Mecca
- Start date
glennster
Well-known Member
first suspect is the in line filter. pull the filter and see if it has any crud in it. also, it may be a fuel filter for a pressurized fuel system, not a gravity flow. if you are going to run an inline, try a napa 3032 or 3031 filter, depending on the size of your fuel line. check your fuel flow at the carb to be sure you are getting enough. from there , i would look to air cleaner for debris, possibly a mouse nest or mud dauber wasps. if thats all good, look to the ignition coil or condenser.
erik dekeyser
Member
I had trouble like that with a 140 and it was dirt at the top of the sedemint bowl. An easy fix is to remove the drain plug at the bottom of the carb. and blow some air with the air compresor up through the bottom of the carb. It worked for me .
Andy Martin
Well-known Member
I have also had a ring of organic debris floating around in the fuel tank, occasionally plugging the sediment bowl inlet. It was very hard to track down.
The solution is to check the tractor quickly when it dies. Immediately pull the carburetor drain plug and see if it still has pleanty of gas. If it has gas, see if it has spark. You may have a coil or condenser getting an open circuit when it gets hot, and 20 minutes is about right. As soon as it cools down it will run again, so check it immediately after it dies.
I have never had trouble with an inline fuel filter on a gravity fed Farmall but have had several instances of plugging inside the fuel tank. I have also had condensers and coils go bad only when hot. I almost killed a hired hand one time, he was brush hogging and thought he killed a crank start A. He cranked on it until the condenser in the magneto cooled down and it would start, on a 100 degree day. He was a lot more of a man than me.
The solution is to check the tractor quickly when it dies. Immediately pull the carburetor drain plug and see if it still has pleanty of gas. If it has gas, see if it has spark. You may have a coil or condenser getting an open circuit when it gets hot, and 20 minutes is about right. As soon as it cools down it will run again, so check it immediately after it dies.
I have never had trouble with an inline fuel filter on a gravity fed Farmall but have had several instances of plugging inside the fuel tank. I have also had condensers and coils go bad only when hot. I almost killed a hired hand one time, he was brush hogging and thought he killed a crank start A. He cranked on it until the condenser in the magneto cooled down and it would start, on a 100 degree day. He was a lot more of a man than me.
Pull off one of the plug wires asap when it quits
to see if you have good fire to your plugs. It could be a weak coil, but first I would replace the condenser. Pull the gas line to the carburetor to see if there's a full flow of gas. Use a clean container to catch the gas. If that carburetor has a main adjustment screw near the bottom of the carb I would open it one full turn.
Some tractors had a solenoid on the carb to shut
off the fuel. Take a look at yours to see if your carb has that. It may not be opening fully. Hal
to see if you have good fire to your plugs. It could be a weak coil, but first I would replace the condenser. Pull the gas line to the carburetor to see if there's a full flow of gas. Use a clean container to catch the gas. If that carburetor has a main adjustment screw near the bottom of the carb I would open it one full turn.
Some tractors had a solenoid on the carb to shut
off the fuel. Take a look at yours to see if your carb has that. It may not be opening fully. Hal
teddy52food
Well-known Member
You are very lucky that the float didn't collapse.
Allan in NE
Well-known Member
If it "runs great" for a time after you let it set and cool down again, you've got a bad coil.
Allan
Allan
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