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JohnF2015, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1102
Experience:  Owner/Service Technician at S & J Small Engines
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Onan 7500 quite diesel generator will not stay running and

Customer Question

Onan 7500 quite diesel generator will not stay running and flashes
1 then 7 blinks for a fault code of 17
What does this mean?
Thank You,
Submitted: 1 year ago.
Category: Small Engine
Expert:  JohnF2015 replied 1 year ago.

Hi, my name is***** will be assisting you.

Code 17 is a fuel pump code, you either have a faulty fuel pump or the connections are bad going to the fuel pump. I am including troubleshooting steps outlined by Onan to help you troubleshoot the issue.


Some genset service procedures present hazards that can result in severe personal injury

or death. Only trained and experienced persons with knowledge of fuels, electricity, and machinery

hazards should perform genset service. See Safety Precautions.

Logic: Only Active Prior to 2001 – Open fuel pump circuit at control

Possible Causes: Wire connections, harness leads, faulty fuel pump

Diagnosis & Repair:

1. Verify that Last Fault is FC 17: Yes, continue diagnosis; No, troubleshoot actual last fault.

2. Verify fuel pump operation in prime mode, if pump operates fault condition has been cleared verify har-

ness connections, no further troubleshooting.

3. HGJAA, D Check continuity across fuse F1.

4. Disconnect genset control P1 connector, verify P1 pins are fully inserted and inspect pin condition per

PSB–676: insert, repair or replace pins as necessary.

5. Reconnect P1 connector, prime genset to verify pump operation and test run genset for fault occurrence.

6. Measure continuity between E2 fuel pump leads; replace terminals or fuel pump as necessary.

7. Measure voltage between fuel pump E2 + and ground while priming; replace terminals, harness leads

or control as necessary.

I hope that this information helps you. Thank you it has been a pleasure to assist you.

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