Which tubing connect to the carburetor (small for 2.5mm ID fuel line)

hello sir, fuel line routing for ryobi,poulan trimmers, looking at machine from left side,front green line from tank to bottom of port on primmer bulb. rear line from tank which has filter inserted through tank with small white ring pushed up against tank & filter fittings, goes to port at bottom of carburetor.top line from primmer bulb goes to top port of carburetor. that is the way they go on.it is important to make sure you have the same fuel line I.D. and O.D. are very important! also if old line dissolved it will get in carburetor and clog ports & small screen inside.clean inside of carburetor with carburetor cleaner & air pressure. to get your parts and numbers ,go to mtd parts.arinet.com, parts,791-683398,fuel line assembly.hope this helps
.hello sir,routing fuel line for craftsman,homelite, trimmers,fuel tank over engine, looking at machine from rear, shall fuel line on left with filter attached goes to bottom port of carburetor fuel line from right side coming out of tank with inside tip attached goes to bottom port of primmer bulb,top line on primmer bulb goes to top port of carburetor fuel tank under engine,fuel line routing,looking at machine from left side, left fuel line coming out of tank(drain back only) goes to right side small port of primmer bulb, left side larger fuel line from primmer bulb to top port of carburetor fuel line coming out of tank (larger line) on the right side with filter attached goes to bottom port of carburetor when replacing fuel line it is very important to use the same ID and OD line,when the lines dissolve small pieces will get in the carburetor clogging small passages and screen,it is advisable that you clean out carburetor and use a new filter.hope this helps, DON'T FORGET THE 4 THUMBS UP,,,,any comments welcome,thank you.