I have a weedeater 85T. It will start on full choke and run a few seconds if I pump the throttle then it dies. Wont even start on 1/2 or no choke.
I have changed the sparkplug shot carb cleaner in the intake(as soon as its burned up it dies also) . blew out the gas filter, put new gas in the unit ( I empty the tank each fall).
Also when I pump the fuel prime bulb after 2 pumps it stays in the ''pushed in'' position like it cant draw gas.
Check to see if your feul line is cracked or it is drawing air . Check your clamps that hold the lines on . One other thing you can check is to see if any bolts are loose that hold the carb on . Best of luck Ed.
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Press primer bulb 6 times
Move throttle lever to start position
Move choke lever to full choke position
Pull starter rope sharply until engine attempts to start, but no more than 5 pulls.
Move choke lever to half choke position. Pull starter rope sharply engine runs. If engine hasn't started after 5 pulls, repeat all steps above.
After warming up for 10 seconds, move choke lever to run position.
Manuallib.com has a manual for this model available for free download
You haven't provided a lot to go on here but I'll take a stab in the dark. If you are somewhere that is unusually cold, maybe you just need to let it warm up. Could be the choke is not working, could be the choke is closing but wont open because the heat riser passage in the intake manifold is plugged up with carbon, could be the fuel pump is weak or the filter is plugged and the carb is starving for fuel even though the tank is full.
To check the choke operation, take off the air cleaner lid before you try to start it and operate the throttle by hand while watching the choke plate. It should snap shut. If it does rack the throttle two more times, start it up and watch the choke plate. it should open just a little (maybe 3/8') on a cold day let it run on fast idle for a few minutes, as it starts to warm up the choke should open more. And be fully open after a little while. Given it's age it would not surprise me at all if the carburetor is not working right. If you are going to take it to a shop, look for a mechanic in his late 40's. I know that sounds weird but most of the young guys out there have never even seen a quadrajet let alone rebuilt one.