Question about McCulloch 26cc Gas Blower Mcb3208

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Cant figure out where fuel lines go on mccullogh chain saw

Mccullogh fr4618 where do fuel lines go? They are all rotten. I got a new pump bulb and fuel lines but I dont know where they go. Please help Thank you very much

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Fuel lines: one comes from the tank...has a filter in side the tank...runs up to the intake of the carb... you can tell by hooking up the lines to the carb, and put one into a gas supply... press the prime bulb... if it pulls gas, thats the one to hook into the tank...if not it 's the other... there should only be two lines a fuel supply and a return pressure line. Clean the air filter while you've got it apart....

Posted on Jul 01, 2009


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Sorry to hear of your predicament. It's upsetting but not that hard to fix.

You'll have to drain the gas out of the tank first and toss it if it isn't fresh. Remove the filler cap. Take the cover off the saw and possibly the air filter if it's in the way.
Turn the saw upside down and shake the fuel filter to the opening of the gas tank (it's inside the tank) and grab it with a needle nose pliers and pull it out. If the line was that bad, you'll want to replace the fuel filter also.
You'll need to get new fuel line, which is clear tubing. You'll need about 6-8 inches of tubing.
Attach the new line to the fuel filter and feed the line into the gas tank and through the hole in the bottom. Pull it all the through to the interior of the saw. Feed the line around to the small metal tube on the carburetor. Before you connect to the carb, cut the excess line off.
If your saw has a priming bulb, connect the line to the fuel entrance on the bulb.

I hope this helps. If it does, I'd appreciate a 4 thumbs up vote. Thanks,

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How you put the prim bulb on a fr4618 chine saw

If you buy the new one first.You will see that they just snap in and out.It will say on the back of the bulb carb and tank in very small letters.Reinstall the fuel lines just as it says.You need to unbolt the pull rope side cover to get to it.Don't worry nothing will fly out at you.

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I'm trying to replace the fuel lines on the primer button of a small McCullough chain saw. The old ones had dry-rotted and fell off, and I couldn't determine which line goes where. My first configuration...

The primer is just a small pump--it is supposed to draw fresh fuel through the carburetor and expel it back into the tank. There are also just two lines on the carburetor--the upper one should go straight to the fuel tank and filter, the other goes to the intake side of the pump. Just pick a port of the primer (remove the other line for the moment), and try to pump fuel into the bulb (make sure the bulb is not decayed as well)--it should fill with fuel if you have the correct connection--if not, just place the line from the carburetor on the other primer port and try to pump again. If still no fuel, something is plugged in the carburetor or the fuel filter. Hope this helps!

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1 Answer

Trying to put back together a poulan chainsaw and cannot figure out where the tubes go into the carborator

The line from the tank that has the filter on it's end is the main feed to the carburetor and goes to the upper port on the carburetor. The lower port on the carburetor goes to the primer bulb which is supposed to pull fuel from the filter to the carburetor and out to the primer, then it outputs excess fuel back into the tank. When the lines are connected correctly and fuel in the tank, pump the primer--it should begin to fill the bulb with fuel after several pumps. Usually, the primer ports are found by trial and error until it works. Hope this helps!

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Chain saw, there is a line from primer to the carb, then what? I cant tell if coming out of the carb it goes back to primer or in the fuel tank? Then should there be a line from fuel tank to the primer?

Similar to this, typical fuel system.
Fuel Line Replacement by
  • The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
  • If the saw is equipped with a primer bulb, an output line from the carburetor connects to the suction side of the primer (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill as it inflates).
  • The pressure side of the primer returns displaced fuel to the tank as it is depressed.
Take lots of notes and a few digital photographs to help with reassembly. HTH

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Poulan or Craftsman gasoline chainsaws are reasonably inexpensive, parts are available, and given a little TLC perform well.

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1 Answer

Fuel leak

hi jaspunkin

check the fuel line,tubes and the integrity of the fuel tank,

regards savumihai71

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