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Ask Hank F. Your Own Question
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14575
Experience:  Certified on Onan and Generac generators
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I have a 5500 onan marquis generator, problem is it shuts

Customer Question

I have a 5500 onan marquis generator, problem is it shuts off durring operation.
Oil it to the top of the full mark and new
Fuel filters and air filters are new
Seems to happen under a load
Any ideas?
Dan
Submitted: 7 months ago.
Category: Small Engine
Expert:  Hank F. replied 7 months ago.

What is the model number?

Customer: replied 7 months ago.
5500 marquis
Customer: replied 7 months ago.
5500 marquis gold
Customer: replied 7 months ago.
Sorry 5.5 HGJAB-1038D
Expert:  Hank F. replied 7 months ago.

What fault code is set in the controller?

Go to the genset and use the switch on the set itself.
Press 'Stop' 3 times within 5 seconds. The light in the switch will start flashing.
If the light flashes 3 times, pauses for 3 seconds, and flashes 3 more times, press and immediately release 'Stop' one more time.
This will put the controller into Fault Read Mode.
The light will flash (X) number of times, pause for 1 second, and flash for (X) number of times again. Count the flashes before and after the pause.
This will be the Fault Code.
Example: 2 rapid flashes, 1 second pause, 5 rapid flashes is a Fault Code 25.
There may be more than one Fault Code stored, so watch the light very carefully. If there is more than one code, it will display them all in order, and then start over again.

Be very careful not to misread a first level fault code (single digit code) as a second level fault code (double digit code).
The way to tell the difference is by the length of the pauses.
There is a 1 second pause between digits of a second level code, and a 3 second pause between codes.
For example, if it is flashing 2 times, 1 second pause, flashing 2 times, 3 second pause and repeating, then this is a second level fault code of 22.
If it is flashing 2 times, 3 second pause, flashing 2 times, 3 second pause and repeating, then this is a first level fault code of 2.

What Fault Code are you getting?
.

Customer: replied 7 months ago.
36 is the fault code
Expert:  Hank F. replied 7 months ago.

You probably have a bad fuel pump.

Run the genset until is shuts down.

When it shuts down, immediately check to see if you are getting fuel from the pump.

If not, the pump is bad.

Expert:  Hank F. replied 7 months ago.

Was this what you wanted to know?