I have a 2020 Hisun 450. It was only 17 hours old when it started to malfunction. All google searches say replace injector and add fuel filter. Mine had a fuel filter but who knows how rough that is. So I also ordered a K&N fuel filter. Hisun sucks, if they work well they'll hit or miss. Save money and buy a used brand.
Universal Fuel Tank Lock Ring Tool For Chrysler, Dodge, Ford, GM, Nissan, And Jeep Wrangler - Easy Fuel Pump Senders Removal And Install Tool
44 Review
Lucas Oil Fuel Treatment Quart - Tan Color, 1QT Size
31 Review
Hy-Per Fuel Complete Gas System Cleaner By Rislone
24 Review
Restore Your Diesel Engine Performance With Archoil AR6400-D Fuel System Cleaner
31 Review