Bog us usually caused by a bad accelerator pump. They are usually
included with a rebuild kit. You just have to make sure the pump in
the kit is the right size. A friend on mine rebuilt his carb and still
had bog. I took his carb apart and found that his pump was too big in
diameter. He just squeezed it together and stuffed it in its hole. I
found him the correct size pump and the bog disappeared. An
accelerator pump simply squirts raw fuel into the carb on acceleration
to prevent bog.



wrote:
Hey folks, saw a thread earlier on the topic & wondered if anyone could
help. I've had probs with the stock (carter) 4bbl carb on my Merc 4.3
The bog is really irritating. I was told to just get a "square four"
Holley and be done with it. I'm OK with this if the Holley really is a
better carb. My mechanic really wasn't able to adjust the carter that
well. One problem is finding a holley to fit. There is a Holley 600
listed for OMC/Volvo- but I dunno if it will fit my manifold.

Anyone know of a carb & an appropriate adapter for my application?
Should i just say to hell with it and go to TB fuel injection?

THANKS!