I renewed the fuel lines on my McCulloch Mac 2816 petrol string trimmer and now the engine starts but won't run for longer than 10 to 15 secs.
The fuel line arrangement is hard to understand as it seems to draw fuel out of the tank through the carburetter and then back into the fuel tank. I need a drawing or access to an online manual to view a breakdown view of the engine fuel lines etc. McCullochs site is woefull and I cannot find any mention of my petrol trimmer. Can anyone help.
Paul

paul boyle, September 2005

mine dose the same thing, i might rebuild the carburator. but also a tip, the original fuel filters need to be replaced. just get an echo filter. mine is a 1997 and you can get the manuals online free.

caidenw11, October 2012

Had this same problem. Put new fuel lines on. Found the problem. Part needed is a diaphram assembly metering. It is a diaphram on the bottom of the carburator. You have to take off 4 screws to remove the plate covering it. The diaphram should not have any holes or cracks in it. Found a web site that has a parts break-down and parts list.
http://www.oscar-wilson.com/MANUALS/MCCULLOCH/211703-03.PDF
Phone number of the parts place: 606-678-9623 Good Luck!

Tom, November 2009

you can downlaod the manual here:

http://www.google.ca/search?hl=en&newwindow=1&as_q=&as_epq=McCulloch+mac+2816&as_oq=&as_eq=&num=30&lr=&as_filetype=&ft=i&as_sitesearch=&as_qdr=all&as_rights=&as_occt=any&cr=&as_nlo=&as_nhi=&safe=off

Bill, June 2009

You do not need a new trimer. The large stem on the carb goes to the gas tank, the small stem goes to the primmer bulb and then to the tank. The primer goes to the front hole in the tank.

Rubber Duck, March 2009

you need new trimmer or answer from someone whu know. I have a same problem.

vats, July 2008

you need new trimmer.

vats, July 2008

Hello, the fuel line goes from the top connection toward the back of the carby to the hole that's toward the middle of the tank, this would have the filter on it, the other fuel line comes from the outer connection on the primer to the hole on the outer of the tank. The other (middle) connection of the primer goes to the other connection of the carby, the one closer to the pull start cord.

Steve, December 2005