682 won't start

[enigma]

I've got a 682 GT that won't start.

I have not yet fixed the electrical starting issue (intermittent issue -doesn't occur often- where I don't even get a starter click probably due to a safety switch corroded or shorted somewhere) yet but...

I used the tractor this past Saturday and then my last 5 minutes of it running, it was running very very poorly - poor power from it and sputtering. I had to increase/decrease the throttle to make it sound better. It never did die out but I think that had I not played with the throttle, it would have.

Anyway, I shut it off after using it but 10 minutes later, needed to move it to put it away. Well, it wouldn't start at all. It appeared to be the electrical starting issue again. So, I got it pulled back into my garage.

**** Now, the tractor won't start at all. Turn the key and the starter clicks as it should but gas ends up leaking out of the exhaust pipe. Yes, may be I flooded it. So I let it sit overnight and tried again this morning - same thing with the key in the start position for may be 10 seconds. I pulled the spark plugs and see the plugs are covered in gas. So, it would seem that gas is in both cylinders and through the engine enough to come out the exhaust.


Any thoughts on whats wrong? Or where to start looking?


Yes, I know - also need to fix the electrical starting issue. However, even with that, THIS problem wasn't occurring.

Thanks in advance!

-Bob

[J-Mech]

Sounds like a leaking needle valve in the carb.

[enigma]

Thanks J-Mech. I did clean the carb and replaced the needle / etc (whatever else came in the carb rebuild kit - I think it was the needle and gaskets) shortly after I bought this CC last summer. It ran fine after doing that and I've used it a few times so far this year and it has ran fine until now.

I haven't messed with the carb yet this year but I guess I can open it up again.

Thanks

[jimbob200521]

I'd bet a dollar it's the fuel pump. Seems like a common issue with that tractor/engine. Not hard to fix, just annoying. Pull your oil dipstick and smell it, I bet it smells like gas. Order a new pump, install it, and be done with it.

But whatever you do, drain that oil/gas asap! Gas in the cylinders/crankcase is bad bad bad for a machine.

Good luck!

[J-Mech]

Originally Posted by jimbob200521

I'd bet a dollar it's the fuel pump. Seems like a common issue with that tractor/engine. Not hard to fix, just annoying. Pull your oil dipstick and smell it, I bet it smells like gas. Order a new pump, install it, and be done with it.

But whatever you do, drain that oil/gas asap! Gas in the cylinders/crankcase is bad bad bad for a machine.

Good luck!

Ryan is right. If your still getting gas in the crankcase then it may be the fuel pump. HOWEVER, that doesn't explain the gas coming out of the exhaust. I had a fuel pump one time that was starting to disintegrate. Kept plugging the needle valve in the carb and flooding the motor. My 682 just did the same thing. I ordered a carb kit and a fuel pump for mine. I don't like to tear things apart twice.

[enigma]

Thanks guys!

Anyway to test the fuel pump?

[jimbob200521]

Originally Posted by J-Mech

Ryan is right. If your still getting gas in the crankcase then it may be the fuel pump. HOWEVER, that doesn't explain the gas coming out of the exhaust. I had a fuel pump one time that was starting to disintegrate. Kept plugging the needle valve in the carb and flooding the motor. My 682 just did the same thing. I ordered a carb kit and a fuel pump for mine. I don't like to tear things apart twice.

I really don't want to admit it, and kinda have been hiding it, but remember that 682 I had that without much investigation I thought had blown up on me? You know, the one I traded for a set of Ag's and wheel weights? The one that spit gas out its exhaust and such? Well, turns out the guy I got rid of it to replaced the fuel pump and it's still going strong to this day. So, it is possible that gas is coming out the exhaust due to a bad fuel pump if you crank it enough

[jimbob200521]

Originally Posted by enigma

Thanks guys!

Anyway to test the fuel pump?

There is a line going to the fuel pump from the tank, and then one going to the carb. Remove the carb end of the hose and crank it a couple times. That'll tell you if the diaphragm is bad and allowing gas to leak into the internals.

[J-Mech]

Originally Posted by jimbob200521

So, it is possible that gas is coming out the exhaust due to a bad fuel pump if you crank it enough

No, not unless the needle valve is stuck open. That's the only way. Or if the crankcase is full of gas.... but a quick pull of the dipstick would tell you that.

[J-Mech]

Originally Posted by jimbob200521

There is a line going to the fuel pump from the tank, and then one going to the carb. Remove the carb end of the hose and crank it a couple times. That'll tell you if the diaphragm is bad and allowing gas to leak into the internals.

You don't have to remove the hose to do that. If the engine isn't running, and the internals are bad, cranking on the motor would make it leak.

To the OP: If your oil has gas in it, just replace it. Not really any other way to tell. If it's the original FP, it's due.