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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14740
Experience:  Certified on Onan and Generac generators
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I have an generator that at it starts the fuel pump does not

Customer Question

I have an generator that at it starts the fuel pump does not keep up. Then it runs out of fuel and dies. I can prime it up again but this keeps happening. I replaced the pump, but same outcome. I thought that maybe the line in the tank could be bad, but I put a line into a can and same outcome. Seems like the pump isn't running when the engine starts?
JA: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?
Customer: I put the line into a open can.
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: No
Submitted: 9 months ago.
Category: Small Engine
Expert:  JON replied 9 months ago.

Approx how long will it run? What engine is on this machine?

Customer: replied 9 months ago.
Two minutes
Expert:  JON replied 9 months ago.

What engine is on the machine? What model machine?

Customer: replied 9 months ago.
It is on a Generac GN-480 OHVI Q-55G
Customer: replied 9 months ago.
Text works fine
Customer: replied 9 months ago.
This generator is mounted on a RV, line runs into vehicle fuel tank. Tank is full of fuel.
Expert:  JON replied 9 months ago.

Okay, sorry for this, but this is out of my expertise as I am not familiar with RV Generators. I will OPT OUT and let another expert take over to help you. Please do not respond as it will lock me to the question again and others will not be able to help. Good Luck, and sorry I couldn't be of assistance

Expert:  Hank F. replied 9 months ago.

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

What are the Item and Serial numbers of the genset?

Customer: replied 9 months ago.
The generator is a Generac Highline Q-55G, GN-480 OHVI. Model 09592-3 Serial(###) ###-####5500 Watts: It is mounted in a National RV.
Expert:  Hank F. replied 9 months ago.


Remove the cover from the control panel. Be careful - those 4 screws are tiny and easily dropped.

Inside the control box, you will see a 2-pin tab with 3 wires attached to it. All 3 wires will be numbered "14".

Connect a test light or a voltmeter set to DCV to that tab.

Start the genset.

While the genset is cranking and running, that tab should read 12V.

Does it?

Follow the fuel pump wire. Does it connect to this tab?

Expert:  Hank F. replied 9 months ago.

Have you had a chance to check this yet?

Customer: replied 9 months ago.
I have a framily emergence, I will call when I get back home. Thank you
Expert:  Hank F. replied 9 months ago.

Not a problem.

I hope everything works out for you.