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Generator won't start until we provide 12 volts to fuel

Customer Question
Generator won't start until...

Generator won't start until we provide 12 volts to fuel shutoff solenoid otherwise won't start. We changed all sensors. Thanks

Mechanic's Assistant: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?

Yes

Mechanic's Assistant: Do you plan on doing the work yourself?

Yes I am

Mechanic's Assistant: Anything else we should know to help you best?

Onan 12500 quiet diesel generator.

Submitted: 4 months ago.Category: Small Engine
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Answered in 1 hour by:
3/28/2018
Technician: JON, Small Engine Technician replied 4 months ago
JON
JON, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1,875
Experience: Certified Small Engine Technician
Verified

Hi, my name is***** me review the issue, and I will be more than happy to help resolve it as quickly as possible. I will return in under 5 minutes

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Technician: JON, Small Engine Technician replied 4 months ago

if the fuel solenoid on the bottom of the carb?

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Customer reply replied 4 months ago
It's s diesel generator and it's located on end of fuel rail.
Technician: JON, Small Engine Technician replied 4 months ago
Sorry, I just seen this was a diesel gen set. I'm strickly a gas tech. Sorry, I will opt out in hopes of a diesel mechanic to assist you soon
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Technician: Hank F., Technician replied 4 months ago
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15,988
Experience: Certified on Onan and Generac generators
Verified

Hello, my name is ***** ***** I am going to assist you with this.

What are the model and serial number of the genset?

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Customer reply replied 4 months ago
Model12.5hdcab11506a
Serial dooo087764
Technician: Hank F., Technician replied 4 months ago

Ok.

This unit does not have a fuel solenoid. It has a governor actuator.

Have you tested the wires going to the actuator to see if they have 12V while cranking?

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Customer reply replied 4 months ago
They have 4-6 volts. We add 12volts and generator fires up. We have replaced both sensors. Temp and oil.
Technician: Hank F., Technician replied 4 months ago

The temp and oil switches have nothing to do with this - they are both bypassed during cranking.

The actuator gets its voltage straight from the control board.

If you are only getting 4 - 6 volts on the actuator wires, either the wire is partially broken between the control board and the actuator, or the control board is bad.

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Customer reply replied 4 months ago
That the board in the air box. If so they can be pricey w no returns.
Technician: Hank F., Technician replied 4 months ago

Yes, that is the board on the air intake resonator.

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Customer reply replied 4 months ago
Do you have any recommendations on testing board. I have heard problem could be that generator getting weak. I don't believe this due to when we provide 12v to actuator it will run 2-a/c units and entire racing rig forever until we take 12v away. Also if you still thinking the board where best place to buy part from. Thanks
Technician: Hank F., Technician replied 4 months ago

There is no way to directly test the board.

As I said earlier, the board directly powers the actuator. Either the wire between them is bad, or the board is bad.

A weak generator has nothing to do with it. The generator is not producing any power while it is sitting still, and only minimal power while cranking.

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Technician: Hank F., Technician replied 4 months ago

Was this what you wanted to know?

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Technician: Hank F., Technician replied 4 months ago

Hello, was this what you wanted to know?

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Technician: Hank F., Technician replied 4 months ago

Due to your refusal to respond, I will be reporting you as a non-compliant customer.

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