Holley accelerator pump adjustment
- Thread starter 6t4polara
- Start date
Try moving the cam to initiate the squirt sooner. Check for max stroke. Increase shooter size a little.
Mike
Mike
91r/t
Well-Known Member
My runner had the same issue off idle stumble. I run a 750 vacuum secondary on my 383 thats moderately built and had to up the squirter size a few sizes to solve it. All is perfect now. I believe mine came with a 28 size squirter which is relatively small. I run a 33 now I believe and its perfect.
Where is your timing?
Holley has a selection of different accelerator pump cams in addition to the different shooter sizes. Most of the cams also have more than 1 mounting position(screw hole). Trial & error.
Have you checked the adjuster at the accelerator pump lever? Should be loosely touching so your getting a squirt immediately after you touch the gas, a little slop equals a delay from the accelerator pump.
Ronnman
Well-Known Member
There are some videos on YouTube on how to adjust the pump. Check out the JEGS video starting about the 5 minute mark.
Ron
Ron
BSB67
Well-Known Member
This first.
Second, make sure that the idle mixture is not too lean. Slight stumble just off idle with light throttle is usually not the pump or squirter.
Yes and check those pesky float levels...or you'll be chasing your tail as they say.
That's good news, thanks for the follow-up.
Keep an eye on your plugs; the idle screws affect mixture beyond just idle and you don't want to fix one area and cause a rich condition in another.
The 1 1/2 turns out on idle mixture screws is the starting point in my 3310 experience, so good.
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