The gas tank on my stilh 420 blower is craked and keaking need to replace tank

Russ please explain "it runs at over 1/2 throttle".

replace your fuel lines first... you will need to remove the tank for this... then check to see if the carb is adjustable... if not replace it

Why are you trying to remove the fuel tank just for broken fuel line?
These can be normally be replaced while the tank in still mounted using the appropriate tools.

As for removing the tank you probably need to remove that starter assembly or may need to fully disassemble the casing.

Hi
Stilh recommend 0.020 inch (20 thou), however I have found that 0.025 (25 thou) or 0.6 mm provides a better start and run arrangement.

Regards
Jacko from down under

Ok first off drain all fuel out of the saw replace the fuel tank filter, then clean out the air cleaner, pull the spark plug out and with some and paper sand the spark plug so that it's clean. NEXT mix some new gas mix and add to the tank try putting the choke on full and pull rope about a dozen times then put choke in partial open and try starting. If it does not start pull spark plug and pull starter rope and see if you have spark if you do add a capfull of gas mix into the spark plug hole and tighten the spark plug down and try pull starting if it fires off and dies then you have a cracked fuel line and need to replace the fuel line. When you have the plug out spray a small amount of WD 40 into the sparkplug hole and pull the rope a few times to get rings lubracated then add the gas. If it won't start post here and I will give you more directions to test for starting again. HOPE THIS HELPS AND THANKS FOR USING FIX-YA.

Check the fuel lines for cracks/breaks. If they are o.k., then:

Youwill need to disassemble the carburetor and spray withcarb.cleaner.Make sure the small screen is free of debris. (Should beable to see daylight through it.)

Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152),to clean the small portals in carb. These portals can become blocked. Reassemble and start.

If the carb. parts are more than 4 years old, you may have to replace them.

If you need further assistance on:
1. Fuel line replacement or
2. Carburetor kit replacement

Just let me know.

Jim

If it is under 2 years old, I would take it to a warranty repair center. The carburetor have been giving some problems so they have needed to be replaced because they are sub standard quality.

This usually is caused by the diaphragms in the carb are stretched or stiff and are not responding properly to turning the engine on its side. also check to see if the fuel filter is able to move around in the tank as you tilt the engine.

How old is it?

Your brief description of the problem points toward air in the fuel lines.

Remove the engine cover, and try to see how flexible the fuel lines are. If they are hard and brittle, it's time to change them.

If you need further assistance let me know.

try the fuel filter and make sure you have proper oil pressure!! Remeber if you have tried craking to many bad times then the plugs are going to be fouled out!! Means that they are going to be drowned with gas and need replacing!! Also make sure your fuel pump is coming on!! You should hear a hissin or a hummin noise back from the fuel tank!