I never thought about it's the fuel tank screen. One thing I noticed is that the the needle in the fuel gauge keeps moving back and forth. Sometimes it shows I have 1/4 of gas, sometimes it shows empty. I think the fuel guage sender is also bad.
I think you are right that I need to have the fuel tank screen cleaned. Do you think I should let the garage do it or I can do it myself? I have the factory manual and I hope it has all the information I need.
Thanks for your help.