Echo Gas Blower 135 MPH390 CFM Blower PB250 - Answered Questions & Fixed issues

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

if there's a primer just hook the lines up. when priming if the gas is going back into the tank then its correct. if not then swap the lines.

You probably have the needle in the carb not shutting off or going back to shut off the fuel. What you need to do is rebuild the carb and most lawn shops can sell you a kit to do that. You can see videos on youtube.com as to how to do it if you are not familiar with the rebuild process it is not hard to accomplish. The kits are around $8.00. Hope this helps.

take it out of the muffler and put in a vise. heat it up with a butane torch get it cherry red. take a wire brush and brush off the carbon build up. should just fall off.

Just like every 2 stroke engine. Take carb off, take off both ends and clean. Count the H and L adjustment screws turns so they can be put back the same amount of turns. Take out and clean holes

Clean your carb...

I would say that Daren is on the best track here for repair. Myself i agree with the fact that your carb has some sort of blockage. Start with a good carb cleaning. Good Luck....

Two very good answers, if you go to use the 50:1 ratio you will probably not be wrong most new stuff mixes with the 50:1 ratio these days if your not comfortable mixing the gas, Menards has premixed can for sale, as do most of the big box stores. Very good for novice mixers who don't want to keep alot of fuel around and let it go bad. Great alternative to mixing!

Consider the flywheel. This model uses a flywheel with a built in key. If that key is bent or broken the timing would be off which would explain the backfire. You can source a replacement unit from eReplacement parts. Unfortunately the flywheel is 44 bucks and you have to be able to dismantle the unit to replace it. These blowers cost 200 dollars new. So you have a little wiggle room here. If the flywheel is good you may have a bad coil which can cause timing problems or weak spark. But those are 76 bucks so look at the flywheel first.

the new carburators do have adjustments but consumer is not allowed to adjust do to epa regulations find an echo dealer or echo repair tech with tools to do job everyones answer is carb clean carb clean damages diaphrams and seals in carb never use carb clean on lawn and garden equipment.

Check plug, fuel mix and then clean carb real good. Good luck....

One question: Is the unit equipped with a primer? If so what does priming do? If it wont prime do the following: Check your fuel lines to verify they arent collapsed or blocked. Also replace the fuel clunk in the gas tank. Check fuel cap vent for blockage too. Finally, make sure the fuel lines havent been crossed. Good luck and be careful!

Check if there is a spark arrestor in the muffler out let, if this is blocked with carbon, or the exhaust port is blocked with carbon you will get this

pull carb off, dissemble it and replace needle and diaphram (carb kit) and clean it thourghly and then also make sure your tank vent is working properly cause if not it will drain your fuel tank also and fill your crankcase and cylinder with fuel !

Sounds like fuel line problem. Empty fuel tank,remove black fuel line grommet,check for line break or disconnection.If line is broken , purchase fuel line kit with grommet as a set if lines or grommet are deteriorated.

Look on the carb for 2 screws side by side. where those screws go into the carb, it will be stamped with an "H" and "L". Open the screw that is next to the "H", counterclockwise about 1/4 turn at a time with the engine running, that should solve it.

You need to pull the hose from the tank and check it. Also check the carborator. I would pull the carb and soak it in oven cleaner for about 10 minutes. Spray it very good then rinse it well. That should clear things up.

I wrote you an answer on how to remove the blower fan, did I miss something ? or are you removeing the flywheel?

remove black fan cover and then take schute off the blower and remove philips screws to split the case and use an impact to remove bolt and fan comes off

It could be a couple of different things. Here are my Tips for this problem:
www.fixya.com/support/r6078121-fuel_line_relacement_trimmer_weedeater

Good Luck!

Jim