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Check gas cap first for vent being plugged as this will create a vacuum in the tank and prevent fuel delivery. Test when problem occurs by immediately loosening cap and retightening to see if restarts right away you might even hear air going into the fuel tank.
If it doesn't restart, possible coil. Coils are usually affected by the increase of heat when running having too high resistance in the electrical windings or possible moisture.
Tank should not have a breather, the fuel cap does that function. Check your fuel lines and where they penetrate the tank. Today's fuel will eat the fuel line over time and there is also dry rot. The fuel lines on these need to be monitored over time to ensure continued safe operation of small engine equipment.
The small green rubber thing sounds like the duckbill vent for a gas cap. Since the gas cap vent sits right over the open hole of the tank, I would check the underside of the gas cap. See if the little rubber vent is there. Normally, they will use a small clear nylon connector to hold the return line inside the tank. The small green thing sure sounds like a fuel cap vent. Here is a link to the diaphragm carburetors site with a tutorial on tuning these little carburetors. I will give you one from Zama and one from Walbro....Zama first.
Replacement fuel lines should be readily available at your local lawnmower repair shop. Your TroyBilt hedger uses fuel line that is 3/32" (2.4mm) interior dimension, 3/16" (4.8mm) outside dimension, with a 3/64" (1.2mm) wall dimension.
Most manufacturers don't offer replacement line, only fuel tank assemblies. Find your local shop, and try to get the TYGON brand...it is yellow. Tygon lasts the longest. You should be able to buy it by the foot for less than $2 per foot. You will need 2 feet of hose to replace both lines.
Make sure to clean the in-tank filter when replacing hoses.
No biggy, you need to buy the same size fuel line tubing, preferably from the dealer, and replace it by undoing the tubing fasteners, little clips you undo with a pair of pliers. Before doing this, make sure you cut off the fuel line valve which should be right under the gas tank, if none, empty the gas tank in a seperate container. Good luck.
Check your fuel lines. It is probably getting air into the system. Also check inside the gas tank to make sure the fuel pick up line is still attached.
If you need more assistance please provide an exact model number and I can better help you.
Sounds like fuel tank vent problem , air has to get into tank
sometimes its vented by fuel cap but a lot of hedge trimmers use
a duck bill valve right thru tank or hooked to hose .
To test if this might be the problem loosen gas cap when it starts to die .
good luck
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