753 shutting down (like running out of fuel)

[Kuchball]

Thanks for the idea, I will concentrate more on the temp stuff next time I have some time. I will make sure to let ya'll know what is causing this when I find out...

Well its been awhile since I have done anything with my issue. So far this winter pushing snow around I have had ZERO issues, I just ran it for a few hours on this past sat. Anybody know if a relay/fuse that would be opening up when it gets hot in the summer. Or is there any kind of over heating sensor that could go bad, then shuts it down.

 

[farmshop]

Well its been awhile since I have done anything with my issue. So far this winter pushing snow around I have had ZERO issues, I just ran it for a few hours on this past sat. Anybody know if a relay/fuse that would be opening up when it gets hot in the summer. Or is there any kind of over heating sensor that could go bad, then shuts it down.

Have you tried putting a test light in place to see if the power drops out to the fuel shut off when it dies? Or try disconnecting the shut off and wiring it in the run position?

 

[walio123]

Have you tried putting a test light in place to see if the power drops out to the fuel shut off when it dies? Or try disconnecting the shut off and wiring it in the run position?

The lifting pump has a rubber membrane that expands when heated when it is old and can not pump fuel. When did you do the test with a separate ken and electric pump where did you tighten the hose from the electric pump? On the lifting pump or directly on the injection pump? If it tied it to the lifting pump, the membrane actually limits fuel flow form electric pump. A solenoid that opens when heated is not available unless your machine is equipped with a BOSS, but in this case it should display an error on the screen.It may be a shut off solenoid with a partially distorted isolation between the bobbin windings, and upon solenoid heating it gives a partial short and relaxes a little stop lever.

 

[Kuchball]

The lifting pump has a rubber membrane that expands when heated when it is old and can not pump fuel. When did you do the test with a separate ken and electric pump where did you tighten the hose from the electric pump? On the lifting pump or directly on the injection pump? If it tied it to the lifting pump, the membrane actually limits fuel flow form electric pump. A solenoid that opens when heated is not available unless your machine is equipped with a BOSS, but in this case it should display an error on the screen.It may be a shut off solenoid with a partially distorted isolation between the bobbin windings, and upon solenoid heating it gives a partial short and relaxes a little stop lever.

I took out the primer bulb and put the 12v fuel pump in place of the bulb, wired a switch on the pump. So far this winter I have not even turn on this secondary pump. I installed a new lifter pump last summer as well. The part that stinks now in the winter is that it is working so I can't test the hold part of the shut off. I have not done anything with the shut off solenoid, and it is an older machine no BOSS.

 

[walio123]

I took out the primer bulb and put the 12v fuel pump in place of the bulb, wired a switch on the pump. So far this winter I have not even turn on this secondary pump. I installed a new lifter pump last summer as well. The part that stinks now in the winter is that it is working so I can't test the hold part of the shut off. I have not done anything with the shut off solenoid, and it is an older machine no BOSS.

Summer or winter, there is only difference in the time the machine will warm up. Once you have worked for 2 hours, even in winter, the machine has reached its operating temperature in all cases. So the problem was in something you changed / I suppose a fuel filter or a lift pump /. It can not be air in fuel line, an solenoid also.

 

[Kuchball]

Summer or winter, there is only difference in the time the machine will warm up. Once you have worked for 2 hours, even in winter, the machine has reached its operating temperature in all cases. So the problem was in something you changed / I suppose a fuel filter or a lift pump /. It can not be air in fuel line, an solenoid also.

I would agree with you that there shouldn't be a difference, but all the trouble shooting I have done and changing filter and fuel pump, lifter pump was done last summer. Now since winter I have not be able to duplicate the problem. That is why I was trying to think of something electronic that would get hotter in the summer. I am all out of ideas.

 

[walio123]

I would agree with you that there shouldn't be a difference, but all the trouble shooting I have done and changing filter and fuel pump, lifter pump was done last summer. Now since winter I have not be able to duplicate the problem. That is why I was trying to think of something electronic that would get hotter in the summer. I am all out of ideas.

The only electric thing in this engine that can shut it off is shut off solenoid. But it has to extinguish the engine abruptly, not gradually with a slowdown in speed, All the tests you have made of it exclude this and lead me to the thought of a weak membrane of the lifting pump. The difference in the temperature of the fuel in the winter and summer is high. During winter the fuel is very cold and can cool the membrane and it works properly enough. Electrically or electronically cause this problem I just can not see.

 

[Kuchball]

The only electric thing in this engine that can shut it off is shut off solenoid. But it has to extinguish the engine abruptly, not gradually with a slowdown in speed, All the tests you have made of it exclude this and lead me to the thought of a weak membrane of the lifting pump. The difference in the temperature of the fuel in the winter and summer is high. During winter the fuel is very cold and can cool the membrane and it works properly enough. Electrically or electronically cause this problem I just can not see.

Good info and that makes sense also. I can always try a different lift pump. Thank you!!

 

[farmshop]

Good info and that makes sense also. I can always try a different lift pump. Thank you!!

The electric fuel pump you installed should push through the factory lift pump unless there is a blockage but then cool down wouldn't help with that. I would put a piece of clear hose somewhere in the system so you can see fuel flow when it decides to act up

 

[Kuchball]

The electric fuel pump you installed should push through the factory lift pump unless there is a blockage but then cool down wouldn't help with that. I would put a piece of clear hose somewhere in the system so you can see fuel flow when it decides to act up

I haven't switched on the fuel pump I installed this winter at all. I just tried that this past summer. The lifter pump I did put in was a cheap one off amazon. So like Walio123 said, it may have a weak membrane. Maybe I should get a OEM lift pump and try that. I always try that cheap route, and it ends up costing me more...Damn

 

[walio123]

I haven't switched on the fuel pump I installed this winter at all. I just tried that this past summer. The lifter pump I did put in was a cheap one off amazon. So like Walio123 said, it may have a weak membrane. Maybe I should get a OEM lift pump and try that. I always try that cheap route, and it ends up costing me more...Damn

o not hurry to buy anything and spend the extra money. As the machine now works normally, do not look for damage now. It could have been a little trash under the one-way valve of the lift pump, which had come out of there. Just if it happens again, connect the electric pump to the fuel filter and the other filter hose directly to the injector pump.

 

[1994 753]

Hey everyone, thanks for the add. I have been reading through some older posts, and can't find the answer. I have a 753 C-Series, 512726223 with about 800 hours on it. The issue is, is that after about 20min loses power and shuts off. I have replaced fuel lift tube and filter, lift pump, hand primer, fuel lines are all good, multiple fuel filters. I have tried with my fuel cap cracked, I have ran out of different fuel source and same thing. Primer has never been sucked flat. If I walk behind it while my son drives, i can keep it running with the primer bulb. It seems like when it gets warm, that is when the problem happenes. If I let it sit for 1-2 hours, no difference. But if it cools all the way down like I've waited 6 hours, then it is fine for another 15-20 minutes. I did just get a new fuel cap since they are cheap, just haven't had a chance to try it yet. Great stuff on this site, and thanks for any of your guys help/knowledge...

I had the same problem. There is an injection pump breather,(it has a knob that screws in and out) mine had vibrated completely shut. I'm not sure how much it's suppose to be open but I opened mine half way and it fixed my problem.

 

[Kuchball]

o not hurry to buy anything and spend the extra money. As the machine now works normally, do not look for damage now. It could have been a little trash under the one-way valve of the lift pump, which had come out of there. Just if it happens again, connect the electric pump to the fuel filter and the other filter hose directly to the injector pump.

Sounds like a plan to me, thanks for all your ideas and help on this. I will update when the weather warms up this spring.

 

[Gil]

751 runs when cold then quits after 10-20 minutes