19-06-2021, 09:19 AM
I had a similar problem with my RP and eventually had to bite the bullet and have the tank cut open and professionally cleaned out. It was expensive (about £200 from memory) but was worth it. I then sealed it with Rustbuster Slosh tank sealer that is guaranteed to be ethanol proof. (about £28 for a tin). The work was carried out in January 2019. I also subsequently replaced the fuel line from front to back. I have not had any fuel supply issues since.