My name is ***** ***** I will assist you with your question today.
I'm an independent contractor and I don't get paid until a rating has been made.
We can go back and forth as needed to help resolve the issue you are having. Follow ups are free after ratings, so rate in confidence!
The way these systems work is the senders tell the ECM when to turn the fuel transfer pump on to keep the fuel at about 2-3 gallons apart from each other. If at anytime, you get a 5 gallon difference, the fuel transfer pump will shut off for the ECM will tell it to not pump thinking the second tank has a leak. If you have the generator feeding off the same tank that the engine does, this is wrong. The reason is the tanks will never balance out as you are driving after running the generator all night long. The generator is supposed to be running off the second tank, not the primary one the engine feeds from.
Now if you fill both tanks up and then not use the generator at all and are still having transfer issues, there is then either an issue with the sending units (new ones can have a dead spot in them and should always be tested prior to install) or the wiring to the ECM. Most times if it is a wiring issue, it is at the plug next to the transfer pump. It gets moisture in it and corrodes. Check to make sure there is no corrosion there and then check for dead spots on the sender units with a ohm meter. Also, transfer that generator fuel line to feed off the second tank. This way after using the generator for the night, the tanks will balance out and then the transfer tank pump will then activate to keep the tanks balanced as they need after driving for a little bit.
You want a 5 star service and I want to provide a 5 star service. Please consider that I don't know your skill level as well as I can't see, touch, smell, hear the vehicle/machine in question. Please provide as much detail as possible and I will provide as much back.
Once an answer is provided, you should see a rating screen. Please rate my personal service to you. The ratings are my personal feedback, they are not the site feedback.
Thank you for allowing me to assist you through Just Answer!