mcculloch pro mac 10-10 fuel cap leak

[Mike Ray]

I have the old chainsaw bug in my old age , picked up a nice running pro mac 10-10 , but the gas cap leaks. The vent bushing , duckbill and spring are missing from cap. I'm going to pour out the gas when I get to feeling better( Cold/allergies) and see if some of it might be in the tank ,but i'm doubtful. So do any of you folks have a DIY fix or parts or cap you will part with? Thanks in advance

 

[Wood Doctor]

Perhaps you could contact Mark Heimann. I think he likely has Mac caps. I checked my boneyard and cannot find one. Check the rubber washer seal under the cap. It could be cracked or missing and rather easy to replace.

 

[Mike Ray]

thanks, its obvious the brass tube that hold the duckbill valve and spring are gone

 

[fly2mike]

I have the same problem with the fuel cap on my old ProMac 10-10 saw. The duck bill and everything else is missing. I never even saw what was there originally because I picked up this saw at a garage sale. I've been fixing it up a little bit at a time and it runs great. The only thing left to figure out is this business with the fuel cap vent. I tried to make an older Homelite Duck bill work, but it just fell into the tank.

 

[heimannm]

There are two McCulloch threads in the stickies section, try searching in those threads and you will find many posts on servicing the fuel caps.

I have parts, and or rebuilt caps available if you can't make progress on your own.

Mark

 

[fly2mike]

Hey, thanks for the reply! I ended up making a small brass insert to capture a Homelite Duck bill I had on hand and hoping it will work.