How To Adjust The Accelerator Pump Arm on a Holley Carburetor

Tom Kise demonstrates how to properly adjust the accelerator pump arm on a Holley carburetor.

Subscribe now to make sure you don't miss any of our new products!

HOLLEY ON SOCIAL:

[rodbacon]

Old video, still very useful for us old guys. Thank you.

[TomMoore-hwcw]

Very professional advice in my opinion 👍I'm working on a 65 loadstar with a very old 2barrel holley .. still kicking . 💪

[markdudley]

.015" at full open throttle as far as "available travel" is key; not .015" gap at full open throttle. You're checking to make sure there's .015" of travel left until the pump arm bottoms out at full open. When you're checking with a feeler gauge, you want to make sure you're not compressing the spring on the adjusting nut and you are actually getting .015" of additional movement on the pump arm.

[AZpatriot.]

I would be nice if you guys did a video on the secondary metering plate upgrade for the 1850.

[bobbyoshomebuilt]

Zero lash the thing and put the dam feeler gauges away. Some where long ago someone came up with that stupid feeler guage check, which is absolutely useless. All that matters is the spring does not bottom out, which is nearly impossible unless you crank the thing WAY beyond where it should be.

[brkooduh]

thank you Holley for the new video on this. you actually cleared up a couple things for me. :)

[thedobermangang]

when you changing the power valve do you have to change the jets at the same time

[oldrover]

Good Video, I just learned something, thanks.

[troygibson]

I have a question on my holley. It had a hesitation in it and I had someone adjust and it got the hesitation out of it but now I have to ease into the throttle from dead stop or it want to really take of like I stomped the gas. Is that a possible accelerator pump adjustment. It wouldn’t bother me to bad but it wants to spin especially if it wet. No posi in it so the one wheel spins easy.

[jperkey]

I have a 4160 600cfm on my stock 302 and it stumbles and coughes and dies really bad unless im high in the rpms! Is it too rich and I need to jet down??

[DynoPete]

So if I have "0" lash at idle but when i open the throttle full the pump arm bottoms out then what do i do??

[FaithROK]

You don’t disengage fast idle before doing this?

[roosterable]

Great video and teacher but, Its just not that simple if you just bring it to zero its under adjusted because play in the squirter lever , you almost have to preload it a little so it squirts of touch new 750 so no its not worn out seems like 10thou on preload to me anyway absolutely need road test car for proper results

[The_Vaporizer]

Holley are great at leaking fuel all over your loved classic

[bensonhowell]

Spoken like a true Edelbrock user D. Aldridge. Must not know how to properly tune a carburetor let alone anything else.

[The_Vaporizer]

Wanna waste money and be pissed all the time? Buy a Holley!