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Chainsaw is not getting fuel to carburator

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Check for dirty or clogged fuel lines. Blow out with a compressor, use carburetor cleaner. Wear eye protection, too.

Posted on Jul 03, 2010

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The 2nd line might be a vapor return line back to the fuel tank? I've dealt more with repairing bigger saws more than smaller ones. You should go to a Stihl shop&take a look at chainsaws about the same size as yours&take off the air filter cover&look to see where the carburetor lines go.

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Chainsaw will start but will not stay running.


1. Check Idle settings.
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Chainsaw dies at full throttle, idles fine and works with half throttle


hi

check the fuel filter,clean the gas tank,the carburator ,check the fuel pump(not to be tired).the fine filter inside the carb under the fuel pumpand the sparkplug.

by for now savumihai71

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14" Ryobi petrol chainsaw will only run for 10 seconds


You are on the right track. Keep priming which indicates the fuel mixture is too lean to run. In other words the fuel line is partially clogged up. A drop of water on the gas tank would cause this problem. The fuel is fed on the suction basis. So clean up the fuel tank, (disassembly the carburator) reservoir, needle, float, offrice and fuel filter. A can of carburator cleaner (spray one) is a big help.

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Need manuel to show how gas lines are run to carb. & pump bulb


HOW TO CHANGE FUEL LINE ON McCULL0UGH 2014 CHAIN SAWS.

I have successfully changed the input fuel line by purchasing Tygon tubing from a local lawn equipment dealer. I did not see the box he cut this from, but the tubing I bought measures 0.190" outside diameter. I gave him a piece of the old tubing and he matched it up. A 18 inch piece cost me $1.19.

The routing of the fuel line involves three pieces, one piece from the fuel priming bulb to the carburator is 3 inches long, a piece from the fuel priming bulb to the gas tank is about 4 inches long and the piece from the fuel tank is about 7 inches long. The priming bulb sucks air and fuel from the carburator and dumps it back into the gas tank. Therefore, when you press this repeatedly, gasoline will eventually appear in the bulb when the gas line to the carburator is full of fuel. The bulb may not completely fill, there will always be a little air in the bulb.

The fuel line in has a filter on the end within the fuel tank. If you find this has broken off, as I did, you have to turn the tank upside down and shake the filter and any pieces of broken fuel line out of the tank.

Replacing the fuel lines within the carburator compartment is easy if you remove the carburator first. To work on this you must remove the two screws holding the carburator to the engine. You may need to use a small screw Torx driver, although on my chainsaw, there was also a long straight slot on the head. The line from the priming pump to the carburator goes to the left hand line on the carburetor (as viewing from the top with the blade extending away from you. The input line will go onto the right line on the carburator.

The two lines into the fuel tank are located in the middle of the tank left to right and one about 1/2" above the other. The upper hole is for the fuel intake line. The fuel line passes through this hole and a second hole visible within the tank fill hole.
This was the trickiest hose to replace. How I did it was to use a piece of #12 copper electrical wire stripped out of its insulation. This was fed through the 7-inch Tygon tubing piece until it emerged from the far end. I also found it necessary to put a bull nose end on the Tygon tubing in order to get it to feed into the tank hole visible from the tank fill hole. Why? I don't know, but after 20 minutes of trying to feed the hose (both naked and with the electrical wire inside) into that second hole, I gave it a bull nose on the tubing by careful cutting with sharp scissors and using a sanding block. Perhaps McCullough has a special tool to do this, but a call to their 800 number could not get a knowlegible answer from the parts person.

After the Tygon tubing shows up in the tank fill hole, I pulled it further with needle nose pliers and was able to pull the copper wire back out of the tubing. I then cut the bull nose lead I put on the Tygon tube and installed the filter onto it. I found that a little oil on the nozzle and the carburator lines makes the tubing easier to slip on. The stuff the filter and Tygon tubing back into the tank fill hole and towards the front end of the tank so that it drops into the bottom portion of the tank. After attaching the intake line to the carburator, use the needle nose pliers to pull excess line into the tank.


Reassemble the carburator to the engine and you'll be good for another 10 years of happy chainsawing!

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1 Answer

0340 AV stihl chainsaw won't fire


Spray a little starter fluid down the carburator . It is starts then is is a fuel problem. Most likely a gummed up carburator. Remove and clean . 

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2 Answers

Chainsaw will run for 5 min then stalls out


I would change the in tank fuel filter. Do this by draining the fuel and fishing it out with a stif piece of wire it is conected to a rubber fuel line in the tank. Also check to make shur the screws that hold the carburator to the engine are tight.

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1 Answer

Chainsaw shuts down when chain engaged


hi gregory

I think it has a carburation problem.Check the fuel line and the fuel filter:

cheers savumihai71

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