|Question from a customer:|
I rebuilt the carb ( my first one ever) and put it back on the boat (2005 Merc 4.3L). It started right up and ran great out of water. I took the boat out yesterday (Sunday) and again started up great ran great except for one issue. The Accelerator pump is not closing completely when I have boat in idle after running it open and is causing motor to idle to high but if I manually pull the "cable" to idle position it will idle right at the recommended 900 rpm. Is there something I need or can do to fix this? Its like the accelerator pump is hanging up right at the end.
|Without it sitting in front of me, I'm at a bit of disadvantage, but let's see if I can give some clues.|
1st you need to make sure there isn't something in the throttle linkage causing the problem. Isolate the carburetor by disconnecting the linkage, open the throttle wide open, then let go. Does it return to idle position? If it does, then the problem is obviously in the linkage somewhere. Lets assume it isn't and go from there. Remove the link from the accelerator pump arm. This eliminates any sticking of the throttle plate, or rod problem. Again, we will assume the accelerator pump is still sticking.
Here are some possible problems:
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Posted by Mike on 5/7/2013 to Mercarb
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