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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
I would connect a portable tank and run from that with new fresh fuel to see if it still has the problem. I would test your fuel system for water, also check for vapor lock, if the fuel sat for 2 years then it's very well the injectors will need to be sent out and professionally cleaned.
I am just seeing if you still need assistance with this problem? The reason I ask is because I see that your question has not been answered sooner and I wanted to make sure if you still needed help.
In some cases a question may sit due to several different reasons. My objective that I wish is to make sure that if you still need help that I can at the very least reach out to you and attempt to help you.
At this time please feel free when you are ready to reply back to me and ask to continue working with me, another expert or if you no longer need help please just let me know exactly what you wish to do.