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This could be a number of things. Clogged air filter/fuel filter/carburetor/fuel tank lid breather hole, cracked fuel line or primer bulb, or clogged spark arrestor in muffler. Here's some links that will help to change the bulb, fuel cap, fuel lines, rebuild carb, replace spark arrestor, and troubleshoot. Homelite Tune Up
Check that the carburettor and fuel lines are clean. If the unit has not been used for a while the gas (petrol) will evaporate leaving the oil behind to choke up the fuel system. Dirty fuel will do the same. When adding fuel use a funnel with gauze filter in it and always empty the fuel tank and then run the motor until it dies when you've finished work.
The line on my new 26cc Homelite would also feed out by itself. That started me thinking the line was wound backwards. I wrapped the line in the opposite direction as was shown on the bump feed reel and now the dang thing works although the bump feed needs to be "bumped" pretty hard to work. Is it possible that the reel was manufactured with the (string direction) arrows pointing the wrong direction? The new 26cc unit is also underpowered compared to my older 25cc trimmer.
If all those items you mentioned are ok, then check the Air filter! If it's been sitting around, it may be plugged up or it may have insects that have built nests inside... Also, there should be a fuel line back to the tank for pressurizing the system... Make sure the gas cap is tight, and the return line is snug in the tank.
Ok you have to be 100% certain that you reassembled those hoses correctly, if any one of them is incorrect you are dead in the water as far as getting fuel properly. Tell me 2 things, Why did you feel they needed to be changed? and now that you've done it does the new primer bulb pump fuel at all, and maintain a full bulb of fuel after 15 min?
Not sure about your particular set-up, but there is usually two fuel lines running from the fuel tank. One goes to the carb and the other goes on a fitting on back of the primer bulb. The primer bulb will have a second fitting with a line going to carb. Sounds like either a clogged or leaking fuel line to me. Hope this helps and good luck.
I had this same problem, would run a couple of seconds, stop, and you couldn't start it again.
Had good gas/oil mix 50:1 and 25cc Homelite. Had replaced the fuel filter, gas, spark plug, and took carb apart and cleaned with carb cleaner and primer bulb worked fine. None of that fixed it. What did? Take the muffler off and see if it will start and run with the muffler off. If it does, chances are the muffler is clogged. Also check the exhaust ports and clean them out if plugged with black oil carbon residue.
My muffler was clogged up, took it off, cleaned out the exhaust ports, there was some oil that was in the muffler(oil that didn't burn during combustion). It now starts and runs like a champ on first or second pull.
check the fuek lines for hole and leaks, check the fuel filter and clean if necessary. remove the carbuerator and inspect the gasket; it should be soft and flexible, if it seems hard or brittle replace it. clean the carb with carb cleaner sray (available at any local auto parts store) and compressed air. make sure you get inside the small fuel rail holes. if that doesn't work have the carb repaired at a service center or replaced.