McCullough chainsaw fuel issues

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  #1  
Old 04-23-16, 10:26 AM
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McCullough chainsaw fuel issues

I have a McCullough chainsaw that needed the primer bulb replaced. When I went in to install it, the fuel lines were brittle and fell off in my hand. I went and got a pack of replacement line (one thicker yellow and one thin blue one) and refitted them to the primer and carb as indicated on the diagram. The diagram shows the two holes into the fuel tank as side by side, but mine are one over the other, both the same size and no indication which goes in or out. But because the old ones fell apart, I don't know which line went to which hole.

The thin blue line can be inserted into either hole and I can see fuel residue on the end when I remove it. The yellow one has to be forced into the hole and then only goes in about an inch or so and stops, so it doesn;t reach into the tank. I thought about using the blue for all of it, but the larger nipple on the carb is significantly larger then the thinner line. Needless to say it still doesn;t run.

ANY help or input would be greatly appreciated, thanks very much.
 
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  #2  
Old 04-23-16, 01:50 PM
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Fuel Lines

One line is the fuel return from the primer bulb. The other is the fuel pick-up line and will have the fuel filter attached to the end inside the tank.

I use this tool to pull the fuel lines into the fuel tank:

10-1/2 in. Jumbo Curved Clamp Pliers
 
  #3  
Old 04-23-16, 07:14 PM
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The larger line should be the return line going straight from the primer to the tank. The smaller line goes from the filter to the carb. Both lines going to/from the tank will fit tight enough to be fuel tight with the tank.
 
  #4  
Old 05-12-16, 10:51 AM
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Starts but dies

Well I got the lines correctly installed on the primer bulb and now correctly hooked up to the carb and fuel tank. I can get it started briefly then is just dies out. Only runs for like 20-30 seconds and stops. Also seems like the throttle trigger is a little stiff, but I thought I put the linkage in the top hole and it seems to lay right along the carb and connecting into the trigger slot. Also, the instruction diagram for the fuel lines keep referring to a "filter" on the end of the line in the fuel tank, but there was nothing on the end of the old line I removed from the tank to replace them. Could it be laying in the bottom or the tank or does this model not have one or ?

I am DETERMINED to get this baby going so any more help is appreciated.
 
  #5  
Old 05-12-16, 11:10 AM
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The filter broke off and is in the tank. The carburetor will probably need to be cleaned with it being run without a filter. There is a tiny screen inside that stops up quickly without a filter.
 
  #6  
Old 05-12-16, 05:48 PM
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okay cheese, I'll drain the tank and go from there. thanks!!
 
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