I have fuel coming out of a hose that comes from the engine back to carb and it will smoke like crazy when at high rpm if the hose is connected. I disconnected the hose at carb and the fuel with oil will come out.The tractor is a Troy Bilt 17.5 HP/ 42 inch. I have posted a pic with the hose that is shooting the gas mixed with oil. I have marked the hose with a red x. Any help will be appreciated. Thanks: Jim
fuel issues
- Thread starter jimmy828
- Start date
If it came into the shop this is what I would do. First check the oil level and smell it. If the level is above the full mark or it smells like gas I would change it. Second, looking at the amount of dirt on that engine I would be pulling the carb and rebuilding it. Third, I would take a look at the the plug and air filter, if they are not in good shape I would replace. Here is a procedure I use for cleaning and rebuilding that type of carb. Good luck.
Needle and seat replacement
Remove the carb, and then remove the float bowl. Check the float bowl jet (which is the bowl screw) and make sure the jets both horizontal and vertical are clean and open. Tip the carb upside down and remove the float pin and float with needle attached. Look in the float needle passage and you should see the red float seat at the bottom of the passage. This is where a #5 crotchet hook would come in handy as you need to remove this seat. If you have no hook, but compressed air, you can blow through the fuel inlet and try to pop the seat out. Put your thumb over the passage to prevent the seat from flying who knows where. No air or hook try bending a stiff paper clip to dig the seat out.
I would either give the carb a good 24 hour soaking or have it ultrasonically cleaned at this time.
With the seat out clean the passage way with carb cleaner. Now you must find a drill bit slightly smaller than the passage way, to be used to press in the new seat. Apply a very, very small amount of a very light lube to the new seat. 3-1 oil or lighter, to help seat it better. Carefully insert the new seat in the passage way with the rings on the seat down toward the carb body. Slowly and carefully force the seat down with the back end of the drill bit. Once it is seated, check to see that it did not flip and the rings are up. *Next check to make sure that the float does not have any liquid in it. *If it does, replace. *If everything looks correct, attach the new needle to the float and install with the float pin centered. It everything is correct, the float should seat level to the carb body, when looking at it upside down. If everything looks good reattach the float bowl, making sure that both the bowl gasket and the nut gasket seal properly. Reinstall on the engine and test unit. Remember to have patience and take your time. Good luck, but I don't think you'll need it.
PS: *On the side of some Tecumseh carbs you will find a plastic cover. *Under this cover will be an idle jet. *Remove it and check to see that the jet is open both horizontally and vertically. *You should be able to push the old float needle wire through the vertical opening.
Needle and seat replacement
Remove the carb, and then remove the float bowl. Check the float bowl jet (which is the bowl screw) and make sure the jets both horizontal and vertical are clean and open. Tip the carb upside down and remove the float pin and float with needle attached. Look in the float needle passage and you should see the red float seat at the bottom of the passage. This is where a #5 crotchet hook would come in handy as you need to remove this seat. If you have no hook, but compressed air, you can blow through the fuel inlet and try to pop the seat out. Put your thumb over the passage to prevent the seat from flying who knows where. No air or hook try bending a stiff paper clip to dig the seat out.
I would either give the carb a good 24 hour soaking or have it ultrasonically cleaned at this time.
With the seat out clean the passage way with carb cleaner. Now you must find a drill bit slightly smaller than the passage way, to be used to press in the new seat. Apply a very, very small amount of a very light lube to the new seat. 3-1 oil or lighter, to help seat it better. Carefully insert the new seat in the passage way with the rings on the seat down toward the carb body. Slowly and carefully force the seat down with the back end of the drill bit. Once it is seated, check to see that it did not flip and the rings are up. *Next check to make sure that the float does not have any liquid in it. *If it does, replace. *If everything looks correct, attach the new needle to the float and install with the float pin centered. It everything is correct, the float should seat level to the carb body, when looking at it upside down. If everything looks good reattach the float bowl, making sure that both the bowl gasket and the nut gasket seal properly. Reinstall on the engine and test unit. Remember to have patience and take your time. Good luck, but I don't think you'll need it.
PS: *On the side of some Tecumseh carbs you will find a plastic cover. *Under this cover will be an idle jet. *Remove it and check to see that the jet is open both horizontally and vertically. *You should be able to push the old float needle wire through the vertical opening.
Thanks Rivets for your reply. The info was very helpful. I thought it would be some kind of fuel/carb problem. I don't know much about working on these little engines and your help is much appreciated!! I'll let you know how it works out for me.
turbofiat124
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- Mar 23, 2011
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I had a problem with the carb on my14hp Kohler engine. Usually if the float valve is not sealing, fuel will leak out of the fuel bowl vent hole when the engine is not running. But for some reason this carb seems to vent into the intake manifold (emission reasons?). So when the engine would sit overnight, fuel would fill the crankcase and hydro-lock the engine.
I rebuilt the carb which did nothing. I replaced the seat. Still nothing. After about four times of this I finally put a fuel shut-off valve between the tank and carb and never had anymore problems. Unless of course I forgot the shut the valve off!
So I drilled a tiny hole in the intake pipe between the air cleaner and carb just in case. That way fuel would leak from the hole instead of into the engine.
I rebuilt the carb which did nothing. I replaced the seat. Still nothing. After about four times of this I finally put a fuel shut-off valve between the tank and carb and never had anymore problems. Unless of course I forgot the shut the valve off!
So I drilled a tiny hole in the intake pipe between the air cleaner and carb just in case. That way fuel would leak from the hole instead of into the engine.
Got mower fixed. I disassembled the carb and clean it out good, replaced the filter,plug, changed the engine oil and put a shut valve on fuel line. Working like it should now. I repaired it last week but late on posting back. Thanks guys for the help!!:smile: