How to change the fuel lines in the 128 Ld Husqvarna Trimmer

I answered this yesterday didn't I? I looks like someone deleted my answer because this is still on the main page even though it has been answered by me. It is a shame because the other Answer had diagrams and 3 videos.

https://www.google.com/search?q=Husqvarna+model+21LCN+String+Trimmer.+Fuel+line+diagram

Try this adjustment.
https://chaika.net/how-to-adjust-the-husqvarna-128-trimmer/

buy new ones and replace one at a time, HUSQVARNA 128LD

Fuel Line Fitting PART NUMBER: 530023877


128LD HUSQVARNA TRIMMER Manual

They are juat a pull in fitting. Get access to the fuel tank, the broken fuel line should just pull out the tank. The new full line goes back in through the top, just pull through into the tank until the hole in the tank sits between the 2 flanges on the fuel line.

Rod, Carb. may need adjusted, try loosening gas cap and start to see if cap vent plugged, there is a in tank fuel filter that you could fish out and remove to see if it is plugged. If still not running remove muffler and clean spark arrester screen, if screen plugged the trimmer will do this.
Check the attached links,instruction and guides, Good luck
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Check INSIDE the fuel tank. It is possible the fuel line inside the tank has deteriorated and the filter broke off. That would cause fuel line to FLOAT in the tank instead of lie on the bottom. This could easily be the cause of no fuel in primer/purge bulb. You probably need to:

Install new fuel filter..........Install new fuel Lines.......Install new primer bulb........Clean carburetor.

So in some respects, you are probably correct....no fuel filter equals bad fuel entering carb (but if none in bulb, doubtful much fuel (dried up maybe ) in carb.

You should remove and replace all the fuel lines (including the one on the fuel filter inside the tank). You should get a new fuel filter also. You need to remove the carburetor and install a rebuild kit. It is highly doubtful you will be able to get it to run for more than a second or two because the parts inside the carburetor most likely are dry rotted and very stiff. Open up the carb and check the condition of the diaghragms and gaskets. If they are stiff, the carburetor will not work. Taking these steps will allow you to avoid the frustration of not being able to start the machine. A Husky is a good machine and will perform well if it wasn't abused too bad in the 5 years it was missing. Hopefully the engine itself is still in good condition. A compression test would verify this.

Dirty air filter, dirty fuel system, ie carb, lines, fuel tank. Poor air fuel mixture srew adjustments.

Have it replaced at a lawnmower repair shop.
1.) Have them check the grommet (black round rubber like a thick coin with 2 or 3 holes), replace it if it is crumbly. It holds the fuel line and the fuel vent line - if your trimmer has it. Grommets on the average cost about $6.00. Not all trimmers have fuel grommets, some of them only have holes right on the fuel tank. 2.) Replace the fuel line with Tygon fuel line hose. Tygon can withstand UV light, petroleum, high and low temperatures while retaining its shape. Just make sure the replacement tube is of the the same inside diameter. For a small piece of Tygon hose, ave. cost no greater than $8.00. 3.) Replace the fuel filter. The one inside the tank, connects to the end of the fuel line. Fuel filter, good ones are about $4.00.

Actually the fuel is pumped in by the carburetor. The carburetor work both vacuum and pressure when operating the pump. There is one line in the tank with a fuel filter normally attached; the other line is a return line is normally just inserted a short distance in the tank. To access the filter use piece of wire with a small hook on the end and carefully fish out the line.

If installing new lines change them one at a time as not to reverse their attachment to carb, When inserting the lines into tank cut them on an angle to help get them started then cut the supply line square before installing the fuel filter.