Question about McCulloch 16" Electric Chain Saw 35 HP

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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 didn't work.

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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!

Posted on Nov 10, 2010

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  • martrpjr Nov 27, 2010

    I have an older model Mac 4600 chain saw...the fuel lines around carb have rotted off...thre appear to be 3 diff lines....one to fuel filer 2 more but do'nt know how to route them....is there a diagram I can access to properly repair?

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1 Answer

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You should have 2 to the tank, the one with filter coming from tank goes to nipple on right side of carb, the nipple on left side by primer bulb goes to primer bulb and other from primer bulb back to tank as return line, how it should work is when you push primer bulb it pulls fuel from tank through carb and back to tank on return line so watch in tank orleave one line out that you think is return line and see if gas comes out when you prime, but remember it goes through the carb first before it goes back to tank, had a pic but too big to put on site sorry, 2StrokeJim

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Mr Tittle;
It isn't good but it's all there is.
What little fuel system system detail there is can be found here:
Poulan.com
http://www.ordertree.com/modelinfo/POULAN-WEED-EATER/75.59.html
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Fuel Line Replacement by SmallEng.com
http://www.youtube.com/watch?v=JrXpU70Hmi0


  • The filtered hose from the fuel tank connects directly to the carburetor input connection.
  • If the saw is equipped with a primer, the output line from the carburetor connects to the suction side of the primer bulb (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill the bulb as the bulb reinflates).
  • The pressure side of the primer returns any excess fuel to the tank as it is depressed.
HTH
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Find the model of your saw and open the IPL and handle assembly drawing here:
Poulan.com
http://www.ordertree.com/modelinfo/POULAN-WEED-EATER/75.59.html
This is as good as fuel routing gets!!! If this isn't sufficient Find your nearest Poulan repair facility or try your friendly neighborhood chainsaw seller/mechanic. Resubmitting this question won't get any better answer. HTH
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