Accelerator pump rod placement

[gearhead0991]

Hey i have a 85 ranger 2.8 5 speed. With a 2150 E57E-BA carb. I recently rebuilt it and the instructions for accelerator rod placement said that i should have have 4 holes for adj. Well i only have 3. It was orginally in the top hole. But just wanting to know which one it shold be in. Thanks

 

[RonD]

Use second hole(middle)
If acceleration seems to tapper off before jets take over then switch to top hole.
If engine bogs a bit(floods) on acceleration switch to bottom hole.

Accelerator pump pushes extra gas into the air stream when throttle is pushed down, this allows for quicker rich fuel/air mix for acceleration, the amount of extra gas you want depends on the engine volume, carbs are usually not made for a specific engine displacement, with a larger engine you may want more extra fuel pumped in, smaller engine less fuel.
Which is why there are adjustments like these.