This is what I use to find leaks:
Dave M vin 03572
Not sure I would try guess fixing everything at the moment. With storage also brings out rodents that can chew a mess into things as well.
That being said, I would keep it simple. Just because you have filled it with 91 does not mean it's ethanol free fuel or that the fuel has not gone bad. 4 months for storage of fuel to us may seem short but it's not.
Read this article: https://www.bellperformance.com/blog...-ethanol-in-it
I would run it as dry as possible and fill it with fresh fuel. Once this is done and you still have issues then go deeper.
You may just be creating a mess due to a simple case of bad fuel. Been there done that.
Just my 0.02