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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14621
Experience:  Certified on Onan and Generac generators
19372534
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I have a onan 7000 gen. It shuts down and brings up code 36,

Customer Question

I have a onan 7000 gen. It shuts down and brings up code 36, which is for low fuel cut off. There is not a low fuel cute off wired into this and in the manuals wiring diagram it does not show it either. My mechanic here has done some trouble shooting and the only thing we can come up with is the ecm is doing something. Seem's only to happen when it is hot and working hard. The ecm is $1,100 to replace from oman but I think you can get aftermarket ones. Thanks
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: first time
JA: Do you plan on doing the work yourself?
Customer: yes I have a shop here
JA: Anything else we should know to help you best?
Customer: no that is it
Submitted: 7 months ago.
Category: Small Engine
Expert:  Hank F. replied 7 months ago.

Code 36 is not Low Fuel Cut Off. There is no code for low fuel.

But the low fuel cut off is not an electrical item - it is in the pickup in the fuel tank. The fuel level simply drops to a point below the pickup tube, and the genset can't get any more gas.

Code 36 is Engine Stopped Without Command from Controller. It IS almost always a fuel issue.

If the genset is running for more than about 10 minutes before it shuts down, this is usually a bad fuel pump, although there are other things it can be.

Customer: replied 7 months ago.
In the manual that is what code 36 says. When this happens there is no spark or power going to the fuel pump when you are cranking it over.
Expert:  Hank F. replied 7 months ago.

What is the model number of the genset?

What is the part number of the manual you are using?