I need the fuel line diagram for a Walbro carb. Wt 231 K1 I replaced the fuel lines but wasn't able to figure out how they go. The old ones were broken off.

Not sure... the 310 is 5cc smaller and fuel lines are different.

May be

https://www.ebay.com/itm/Carburetor-Carb-For-Echo-CS-440-CS-4400-Chainsaw-Walbro-WT-416-WT-416C/273678244421?hash=item3fb87e9a45:g:44oAAOSwpptcUVoZ:rk:4:pf:0

same issue with fuel lines but if throttle/choke links the same, save the $s. Look carefully close up images.

Spared my 20 yr old weedeater from garbage man with $15 china knockoff. Easier to start and uns better than ever before with OEM carb.

Walbro WT-820

I know of no diagram available for this. But if you have both lines out and visible you can just put them on the carb, fill the tank and prime it and see if fuel moves. If it does your done....if not....flip the lines and try again!

Hi Lee Miller
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Bud

This is superb, the one I'm trying to fix has been piped up wrong, the primer bul is pushing the fuel through the carb.

It will start and idle, but when ypu open the throttle it dies, from lack of fuel.

Usually the line with the filter on it that comes from the tank goes to carb. inlet first which is most likely close to the bottom side of the carb.nearest to the engine,then the outlet or return line on the carb.goes to the inlet side of the primer and the outlet side of the primer goes back to the tank. The primer draws fuel through the carb to the primer to the tank if its not? then correct the line connections until it does

The Walbro has two connections on it for the fuel line. My Walbro has one connection on the side of the idle screw and main fuel adjusting screw. This connection hooks up to the suction side of the primer bulb. Usually the shorter stem. (You actually **** fuel through the carb instead of pushing it through.) On the other side of the carb is the other hook up. It draws fuel from the tank. This line will connect to the side of the tank that has the filter. The other side of the tank is your return and it hooks to the other connection on the primer bulb. Usually the longer stem.

ok If you have a Walbro WT series carb "without" a built on primer bulb here it is. First off if the fuel lines disintegrated you MUST disassemble it and clean it out. The MOST infintesimle speck of gas line trapped, can allow good prime and bad operation. OK? Don't be lazy on this. Just be delicate removing the flaps gasket and diaphram. ZAMA GND-12 Is the replacement Gasket and diaphram kit fot that carb. Use a cleaner, compressed air or blow good thru it. OK Now...Primer bulb, Carb, and Fuel tank, re connects: Smaller Diameter line comes from Gas tank (Connect filter screen to this in tank) to the short Straight brass carb connector. Primer bulb suction goes to the bent carb brass connector. If small line brings fuel "in" this other line sucks it back "Thru the primer bulb" and the blow side of the primer bulb sends it back to the fuel tank! So...Small Line brings fuel "TO/IN" carb thru short brass connect on carb. Other carb connect goes to bulb suction "IN", Then primer bulb "Pressure OUT" goes thru the larger tube "back to fuel tank". Trust me I know how frustrating a simple diagram is to find online fo this set up. And if you have a carb problem on top of the hook up uncertainty you got frustration. Not only was online help hard to find (Mfg...etc NFG at all!) My local repairshop in BBrook NJ could not tell me how!!! and thats no lie! Walbro has a "generic" carb diagram but no "hook up info" specifically. Poulan don't list it either. And these things routinly fall to pcs. all 3 of mine crumpled together on yr. 3 of use.

On the wt-628 mostly it won't accept a carb. kit, best to buy new carb. and don,t waste your money.