Echo pb 265l wont start. primer bulb shows fuel in the bulb when pumped but when I attempt to start not even a cough. Blower starts and runs when i spray fuel directly into carb but soon shuts off when out of fuel. I have disassembled carb cleaned and blew it out thoroughly and repaced gas still same problem ???

Press the primer bulb several times. If no fuel in bulb, identify the fuel line that connects to fuel filter inside of the tank. Verify filter is connected and no cracks in line.

Then disconnect the other fuel line (fuel return) at the carb. Pump the primer several times. If still no fuel move the fuel line at the carb to the other port. Leave other line off (for now). Pump primer several times. If fuel pumps, fuel lines were connected wrong. Connect return line... start.

The primer bulb pulls fuel from the carb into the bulb and dumps back to the tank, so either the tubes are not connected too the correct conections on the carb, or there is bno fuel getting to the carb from the tank ( fuel filter ) or if the primer is on the carb itself there in a red one way valve under the bulb which maybe faulty.

The bulb pulls fuel from the carb into the bulb and back to the tank, if the bulb does not fill it is because there is a fuel blockage, either in the fuel filter in the tank, or the screen in the carb itself.

if it has spark and doesn't fire on starting fluid try taking off the muffler and run it if ok open the muffler and clean the screen off

first check for spark when it first dies then see if its getting fuel start there

It is very easy to flood this item mind you its easy to flood all petrol trimmers. If plug is wet simply turn the switch to off and pull cord at least 15 times you should get the engine to start coughing keep pull cord but do not turn the petrol on do not prime it either. It should catch. If it does not push the primer once and pull cord

have the carby overhauled
the pump diaphragm and the float diaphragm rot with the fuel ( especially if e-mix is used )
check that the primer bulb is soft and not cracked

I've been fighting with an Echo PB-251 blower and an Echo SRM-225 string trimmer since near the end of last lawn season (this is the forth season I've had them). Along comes a thread on a firearms forum and lo and behold the answer to the problem is spelled out in terms even I can understand.

After reading that thread (which attributes the problem of the engine bogging down when throttle is activated to collapsing fuel lines) I was going to just replace the fuel lines, but I discovered that there are kits that include new fuel lines, rubber grommets, filters, clips and cap seals for about $13.00 each. Hell, the kit for the SRM-225 even provided a new primer bulb. Ten minutes after the UPS truck delivered them to my door I had both machines running like new again. If you've tried other things and it still hasn't worked I highly suggest you try this.

check fuel lines and filter if they are good then may need a carb kit

If its a two cycle engine it sounds like its loading up on fuel.. Need to lean out the fuel on the carb. Not much or it will be to lean an stick the piston..