Touch The Gas, And BAM, She Goes!

Getting your carbureted engine to snap off idle like an injected one, can be a simple matter of fine tuning the accelerator pump. Here are the basics you need to know on both Holley and Edelbrock style carbs.
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[@electrolytics]

I've said it before and I'll say it 100 times yet....I wish I had these videos when I was 16.

[@Z_732]

Yep! Same here. Now I've learned the basics over time, lol. I still watch these though. Because not only do I learn a new thing here or there, but it also reminds me of things I forgot. Because as of late I havent had to tinker as much with the carbs because of the newer fuel injection in the driveway. Problem is, I still have my old stuff I like to play with. But since playing with tham has become rarer. I forget a lot of the little things.

[@johnwilburn]

No kidding. We had no such resources then.

[@tarstarkusz]

Shit, I wish I had been allowed to drive at 16.....

[@Z_732]

@@tarstarkusz when I started driving, I wasn't "allowed". I did it because I had to. It came with the territory, it was part of my job. So was fixing the old things I drove.

[@tarstarkusz]

@@Z_732 I grew up in one of the worst car insurance markets in the US. Having a licensed 16yo would have driven my parents' policy through the roof.

[@needmetal3221]

This shit used to take years to learn. Guys who knew didn't want to be bothered by stupid kids lol. My inner child thanks you

[@jakefriesenjake]

All they had to do was read the Holley book! 🤣🤣🤣🤣🤣🤣

[@hemisidetrack2767]

I'm 61 years old and 21 at heart. You are one of the top guys on the planet. You pass on your knowledge in a brilliant manner that is so down to earth. I have spent most of my life working on my own cars and motorcycles. I wish I could meet you and Cathy I'm person. What cool people you are. Good luck with the new work shop wish I could help you guys move shop. Hemi, Maori for Jim .New Zealand / Tasmania.

[@ben68442]

"remember, the middle hole is the happiest, you've got to play with it" Classic UTG

[@MrTheHillfolk]

I would be in heaven if the wife would say that just once.

[@jasonmarin4052]

That’s what she said

[@lautburns4829]

This is Classic .😜🤪😂

[@Volusiaev]

Is that the "third input?"

[@billbrillford7883]

Wo0o0o0o

[@mopartron3030]

Glad you mentioned initial timing, lots of people don't realize how much that affects off-idle throttle response. If you have a stumble and your initial timing is off you'll be pissing in the wind trying to adjust the carb to fix it.

[@jakefriesenjake]

I have 24 initial and 38 total, no Vac advance.

[@mopartron3030]

@@jakefriesenjake if you do any street driving I highly recommend getting vacuum advance hooked up. If it's set up right you'll gain noticeable fuel economy and your engine will last longer with no bad effects at all. It takes some time but is definitely worth it since it's basically free. I know there are videos on how to do it right, if not from UTG I know for sure some other channels.

[@gordocarbo]

@@mopartron3030 agree. not enough initial can make it run hot and not as responsive as it should be

[@metalbill]

4:12 Life lessons. The middle hole is the happiest... You gotta play with it.

[@dibsolives]

This is the dude you spend with Saturday night in your garage with a 12 pack and a grill. Thank you for the knowledge. Got a holley on my 66 chevy. Know what to look for

[@jeffpriem4888]

Great Content. I had had great success with Holley Double-Pumpers (ie; 750-850) on my mild built 440s. I never really liked Carter/Edelbrock - In 1984 I had a neighbor like UT. - Miss that valuable asset ... (I guess that I'm now the 54 year old neighborhood asset ... too bad no kids are playing with Cars these days)

[@glenholmgren1218]

Tuner Boyz are!

[@thehappytexan]

Make sure your brake booster isn’t leaking vacuum from a bad diaphragm. A lot of guys think they’re brakes suck because that monster cam they just put in doesn’t make enough vacuum, when their booster has been leaking for years and the engine in stock form just simply made enough vacuum to mask the problem.

[@flintlockwood3580]

I can’t believe KZbin censored the closed captioning when talking about timing being “retarded” vs advanced. It’s a technical and medical term not a “bad” word.

[@GideonWallace]

with all the craziness in the world, it's hard not to believe anything.

[@frankstrobel4350]

it's a silly world we live in..... "we" need to cancel the cancel culture.....there are more of us then the cry babies (a lot more....we are just quiet right now )

[@GideonWallace]

@@oldpolak5203 this generation grew up on a book called "if you give a mouse a Cookie" where this little mouse asks this kid for one item and continues to ask for more and more until that child gets fed up. I'm 27, my parents are immigrants from communist countries my father of which barely escaped alive. I grew up as an outsider watching this culture Fall apart, and hearing the commentary of my dad before things got to the point of him fleeing. it's nothing extraordinary, it's not impossible that the US will go under if allowed to continue its course. we are in strange times, and although Tony made a video saying they won't take racing... they're trying to take kids parents and swap their genders (yet raise the smoking age) which is 10x more crazy. car guys are very simple, we like facts, input and output. no other machine can be maintained by an individual, and take them across a continent. Car guys love freedom and individuality, honestly it's the only thing that keeps some guys from lashing out and becoming total dick heads in society. At the same time do not be discouraged, because Communists have used that as propaganda time and time again do not be discouraged, do not give up. talk with your friends, with similar ideas and sit in on a city hall and just troll the hell out of your retarded local politician they may start to get the idea when a lot of people start coming in commenting or even interrupting them when they should be interrupted.

[@bbb462cid]

I can easily beleive it. No-no words used to be an Orwellian joke. Welcome to the new, happier world.

[@MichiganRay]

Didn't know KZbin had closed captions? But not surprised. I understand what is being said here so I would never have looked for it. I don't have time to waste looking for something like that when I am actually trying to learn something. Now I have to figure out why I just wasted time writing this and not reading a post that applies to a carburetor.

[@easygoing2479]

I love it when Uncle Tony talks breaker-points and accelerator pumps. Today, everyone's thinking and reasoning abilities are marinating in so much out-of-touch and abstract digital technology that no one even recognizes any longer which way is actually "up".

[@gregfielder4763]

Great video, UT! I’ve tried my hand at carb adjustment many times over the years, with spotty success. This gives me a better understanding of the mechanism that I’m sure will help me going forward. Thanks for what you do.

[@edwarda2689]

I've got 650 Double Pumper on my 350 and I came across across this video trying to find out why my El Camino stumbles on hard acceleration, after the first 3 mins of watching I went to go check the adjustment to find the damn arm isn't even resting on the bolt but instead is above it! your video has FIXED my issue and additionally I now understand my Holley and carburetors in general a little bit more. You explained things well especially for a younger enthusiast such as myself.

[@evdawg7757]

I'm extremely lucky to grow up at a family car dealership and watching old timers (old now) show me tricks from carburetors to auto body and painting. Being 31 yrs old and knowing this old school stuff isn't in those ASE tests. Having that upper hand against a young ASE certified tech is priceless. I love that I can still learn new things from others like you.

[@justahick3236]

This solved my edelbrock and holly carb problems this information is priceless thankyou for teaching my generation how things work

[@MadMexism]

Uncle Tony is the man! Damn.. and people think fuel injection is complex. Much love and respect Tony. Im 39, and my first car was a 1974 Chevy impala. Put a cam in, and some long tubes. Converted it from a two barrel to a Edelbrock 750 cfm four barrel. i was in highschool, and it was the late 90s. oooh do i miss that car. that son of a gun was a torque monster. Oh, forgot to mention it was bored 30 over, and had a 400 crank thrown in. Bought it from my good ol mechanic teacher in high school. Bought it from him for $800. Keep up the great content.

[@todhurley3756]

Another great video Uncle Tony.

[@MrDaChicken]

Love these simple tips that make such a huge difference. There are less and less people to share this knowledge. And for young people that have experience with new gen programmable cars..... The combination of any 5 or 6 of these little tips from Uncle Tony. ( sounds weird even to type. I'm at least as old as Tony lol ) , would make a full second or more difference at the end of the run. And huge advantage in roll on, in the street say. It would be the rough equivalent of that first stage one tune on an otherwise completely stock new vehicle. As in... no amount of money you spend after that will ever make as much of a difference. My cousin was a motorcycle mechanic with a fondness for British and Italian bikes, as well as cars.. And had a 455 Buick that would snap to redline like a 340 dodge smallblock. Was amusing as hell...

[@jeffschmehl925]

Thanks for the videos Tony. My dad passed about 20 years ago he would have loved you!

[@jackpinesavagerepair1918]

Thank you UT, your wealth of knowledge is extreme and thanks for sharing

[@realmccoy8722]

Men like this are few very well explained I appreciate you being clear and direct

[@justin1978]

You’re the best uncle Tony! Watched three or four accelerator pump videos before I finally got to yours and now I understand it 😀

[@wheels-n-tires1846]

Glad you hit the initial and crucial "make sure everything else is ok" part!!! Sooo many times, ive popped a hood, only to find filters that are more dirt than filter, plug wires filthy and laying on everything, electrical connections that look like Caribbean coral, and when asked when plugs were last changed I get responses alluding to the fall of the Berlin Wall. You cant tune anything if the basics arent correct!!

[@rustbeltcustoms4049]

Thank you for your video!! Moving the armature screw worked perfectly!!

[@tonymayhew191]

I was watching a video on webber carburators, And I thought the dude that was telling you how to make them operate correctly said ( Don't use that stop screw for tuning purposes! It's only purposes is to keep the throttle blades from coming back and connecting with the bore wall inside and causing it to scare or damage it when the throttle is released real quick as you displayed for us here on your video! And I thought that was a very good way to describe the function that screw that we all have turned the hell out of when we were rookies still learning! But I thought of all the grief that would have saved me through the years had someone had explained that as simple as he did! In regular man words ( Just crack it open enough to keep it from contacting the wall of the bore inside, And then don't f#%k with it anymore then that or shits gonna start going down hill real fast from there on trying to get the thing to perform correctly! 🤔

[@Z_732]

Thx for the info UT. Its nice to have the little things entombed here so I can come back. If I ever need to.

[@mikepoint4983]

What a breath of fresh air , these carb how to vids are great . This video reminded me of the video when you you were adjusting the carb on your dart and you threw a part on the side of the road lol . Cheers

[@Joe-xj2tb]

Thank you for taking your time to pass your experience to others much appreciate and much respect

[@mylife-gi2vb]

Thanks for the tips! This will help with my cj build.

[@rickhaile2190]

Thanks Tony. Good info. Did'nt think of checking clearance after r and r of fuel bowl.

[@mistythebest]

Keep up the quality info, old school is a dying art. i"m well versed in old tech but still pickup tid bits from you. keep up the good work! From across the pond (Australia)

[@superrodder2002]

I try to remember as I'm reinstalling a Holley float bowl to rotate the bowl by hand clockwise as I tighten the bolts so the bowl is tweaked the same way each time to save readjusting the accelerator pump arm. Its a little thing but every little trick helps

[@lambrokedrc5998]

Darn, kids always screwin' around 😁😂🤣 K.I.S.S. don't over think it! I needed that refresher! THNX!

[@BustinThumbsForGazzo]

Man you're just a hell of a guy to put all this information out here. Thank you.

[@JDWorkshop-wn9tt]

Great info as always! I enjoy the carburetor tech tips for street/strip. So many want to convert to EFI. I still like a carb on these cars. I just don’t know all the tricks. Thanks for sharing the carb stuff!

[@nathangarcia2153]

Jgmtawgmtkwtgmt

[@pablopickasso4098]

love the hole in the middle!!! but it can get you in a heap of trouble, thanks Uncle Tony!!!

[@lawrenceburchett7411]

A good basic primer on carbs , just got done with trips on a Yamaha outboard , complete rebuild and setup , lots of fun .The problem is yu don't mess with that stuff in these days of injection very much. , thank you .

[@shfr1747]

Basic rock solid info , cheers. I would always go to look for an air leak causing bog or hesitation. You know like worn shaft bushes or simply loose hold down nuts etc. I have a Holley 780 on my 351c which i had overhauled at a carby shop (many years ago) but yeah couldnt loose the bog. Thanks Tony looks like all it was was that adjustment gap on the arm. Cheers , Thankyou.

[@69dodgecharger440]

My 71 New Yorker has a big stumble with a Carter! Thanks now I understand it better!

[@jeffneis553]

THANKS FOR ALL YOU DO, HELPING ALOT OF PEOPLE. Jeff

[@kbergren2878]

Uncle Tony I appreciate your automotive knowledge. Like a previous comment I am 62 and still working on my junk. Current battle is the quadrajet on my '74 454 chevy pick. Bad stumble under acceleration. I do what I can and get professional help when needed. I heard Dan from DD Speed shop talk about your channel.

[@UncleTonysGarage]

If the accelerator pump is working, try looking into the ignition. Retarded timing is my bet

[@drtb69]

Thumbs up Uncle Tony! I always learn something here. Great video.

[@thomasfesta3406]

Great Video Tony! Great job explaining the details.

[@youngsolja1779]

Your a very smart guy thanks for passing this valuable rare info on to us all

[@j1238066]

Great informative video !! My holley stumbles at half throttle might try opening rear barrel screws half turn more than front now they're set about same

[@isaaccarrillo2277]

Thanks for sharing . Ure very right it's better to adjust pumps and the little cam before changing Jets or nozzles

[@L.A.Concrete]

Man I love the carburetor stuff when I was 19 we had an old Ford f-650 and the carb went bad so I said I would rebuild it and my dad’s friend said he will mess it up well he was wrong I did my research and it ran so good me and my dad were proud

[@Anthony-ue4zm]

I always laugh when Tony says when you ever you start to screw around lol

[@Ricks408]

Another great old tech vid Tony thx

[@scottlundy257]

Back in my day Holley sold a trick kit you could get and it had different cams for the pump arm and diff squitter nozzles power valves and other giblet's to tune your engine

[@troyfoster3551]

Thanks Uncle Tony! I’m going to have to try this on my 58 Chrysler Hemi. It’s got a little bog when I whack the throttle!

[@CravingClassics]

Killer video brotha! Excellent explanation as always 👊🔥

[@texasmopar5557]

I have been playing with pump cams trying to get my 340 to launch off of the 2 step. I was the guy neglecting the adjustment bolt on jet change untill now.

[@toddlytodd]

I was seriously just thinking about this issue in my 318 Barracuda.

[@ss67camaronut]

Dude! Just found this channel today-- first the distributor advance- now accelerator pump adj. --- best basic informative site I've seen yet! Wether you know a little, alot, or in between. Young or old, uncle Tony is great! I'm 55 and Tony just became my favorite uncle ;-) great channel-- SUBSCRIBED Thanx cant wait to see more . Will catch up on the past and anxiously await the new! 👍👍👍

[@johnnykruger5212]

I love this stuff!

[@jimgee2676]

i love carburator talk , thanks uncle tony :)i used to run a 750 dp and ran 11.13 @ 123 on a hot day so i decided to swap it and run my 1850s 600 vac carb which i use for driving to and from the track ...long story short i did every single adjustment to it that you just mentioned in this video , pump shot , cam adjustment etc etc and i dialed in that little carb and the car ran 11.21 @ 121 on the 1/4 .....so yes indeed everything you said in your video is key to dialing in a carb whether its for street or strip or a blend of both worlds , thanx utg :),,,btw i havent seen you throw carb parts to the side in a while like your first videos , i miss that

[@171apples171]

I had a 79 coupe deville when i first watched this video.. i somehow ended up going down the dreaded APT adjustment rabbit hole when youre dealing with a Q-jet. It was aweful lol made my own tool out of metal brake line to reach in there and make adjustments. Found a big empty parkinglot and made some clouds hahahaha

[@billcat1840]

Im a AVS guy myself. Could make a Quadrajet run circles around a Holley..I have a fuel injected 5.2 in my Dakota..with my knowledge of timing curves and carburetors Im considering going old school to get some adjustability. Researching how to get the 98 trans to work with this set up.

[@apocolypse11]

Some people be working on carbs for 40 years n dont know the importance of the accelerator pumps. Or jet sizing this guy knows his stuff.

[@matthewcody2963]

Great job, very useful information

[@PorscheRacer14]

Well, maybe I can get my old Big 10 to finally get up and go!

[@growinlegit]

That's what she keeps telling me. wasn't sure what she ment, thanks, now I know. lol

[@DWBmotorsports]

One small thing to add. On a Holley design, When the idle speed adjustment screw is turned in either direction is will change the accel. Pump adjustment as well. So any time the screw is turned double check pump adjustment.

[@davewalters6348]

Very good point

[@JasonsGarargeandrvrepair]

great info guys !

[@louiswright6516]

Thank you UTG

[@drtb69]

Yes accelerator pumps do help throttle response on a stocker or mild built engine on moderate performance engines mechanical secondaries ..proper bend in mechanical Holly rod..and metering block with proper power valve and jets works better.. On the afb-carter type carbs...I.E.) Edelbrock I feel jetting, metering rods and springs do most of it. On the street car..a stall convertor, rear gear ,matching cam-spring set up and proper cfm set up carb with proper timing works for really snappy take offs.

[@surehealer5324]

You should show a video on how you tuned the carburetor on the slant six in detail

[@bcbloc02]

I need to address this issue on the 361 in my d600. Pretty sure it just has failed accelerator pumps from sitting most all the time. That thing idles great but goes dead when you crack the throttle blades until it gets really warmed up.

[@65sohc]

Tony, you need to check out the Thompson Performance Powerblast Plate. I know it sounds hokey but just watch it in action on KZbin. It is essentially a little brass plate that installs above the pump squirters. It converts the pump shot from a stream to a fine spray for much better atomization. One look and you'll be a believer.

[@brucejones7389]

If I ever can find another Dart. I will apply all of your techniques to it

[@mrkultra1655]

Thanks Tony

[@davidkuhn3970]

I have a stumble when I let off on the throttle. Idles good , accelerates good. Edelbrock carb.

[@Mylee837]

Good advise dude you saved me money!

[@brucebeamer2298]

I thought there was only two holes down there 😂. Great info 👍👍

[@cfmechanic]

I agree with checklist first. Plugs and wires need to be good before condemning carb. Had a bad wire that caused a bog on the hit. Thought carb but found wire.

[@Timman57]

Just your friendly reminder that a proper APT (at part throttle) setting on your quadrajet and a FAST brand APT adjustment kit so you don't have to take apart the carb to adjust it, really does make a difference.

[@edge2sword186]

Squirters can make a big difference when you tailor them to the pump cam .Both need to work in concert to get maximum response .

[@prun8893]

Like most of us with a holley and an edelbrock available.....the AFB is on the car and the holley is on the shelf.

[@ericwilkes238]

Im 74 finly have time for some fun toys thanks for explaining

[@jballs1118]

Good video sir I have a 65 mercury comet straight 6 I did the timing, gap the plugs, change the carburetor and now when I put it in drive and go for about 100 meters the cars dies on me. Also the carburetor started to leak from the left side. Don’t know what am doing incorrectly if you can please give me your opinion thanks 🙏 have a good day. You are very knowledgeable in this types of vehicle

[@bbb462cid]

Back in the day I had two dual divorce-choke Q-jets, 795 cfm. I'd run one on the car, keep one in reserve, and every year I'd send the 'old' one to my Rochetser guy for a freshen up and put the 'new' one on the manifold. Hard to beleive what just a year of regular use did the carb. Today...I think I'm gonna do the same but with a DI head, lol

[@Dag0421]

There are 2 trains of thought on the accelerator pump adjustment. One is what you said here but the other is at wot make sure the pump is not bottomed out. That is where you need the clearance. Which is it?

[@thomaseutsler5443]

I love your videos! Watch them all the time! I do have a question tho. I have a Holley 4160 750cfm vacuum secondaries. Off idle punch is great but half throttle it bogs and tries to die. Fresh rebuild, new diaphragms and power valve. Everything else checks out great. I was running an Edelbrock 600 and everything ran great and I switched to this Holley and driveability went into toilet. Any suggestions? Idles great, responds great but driving at half throttle it cuts out

[@MikesBigBlock]

what about a intermittent pump shot on a holley 4412 i got good fuel pressure clean carb motor is mechanically sound but when you give her full throttle sometimes it will give a nice full shot & some times not

[@andyclark3611]

What’s the deciding factor in going from a 30cc to 50cc pump accelerator?

[@garygarza9074]

Great info. 👍

[@alan6832]

My 225 Lean Burn Holley 1 barrel '82 model 1945 smog carb I don't think has multiple holes but does have a U shaped bendable linkage. Can I bend the linkage for more pump? or do I need to drill more holes?

[@CrazyWoody1989]

I've got a practically new holley 600 on a completely stock 350 and it ran great on there for a while but now it idles high when it warms up and has a bog on any kind of even mildly hard acceleration. Acts to me like a vacuum leak but I absolutely can not find one

[@russelljackson7034]

Right on

[@Bigredbowtie]

I literally just got my international running and was wondering why it would bog down when I gave it gas...well I hop on KZbin the very first suggested video😂

[@damonkirkland2845]

I have a p-80 I don’t know the size it’s on a 1956 Ford fairlane with a 272 y block 3 speed top loader I’m thinking it’s to big stays running in idle but when I pull off its die down or burn tire then die back down

[@sheldonbaxter9558]

Not sure if you will get this. I have a ford 390 with a 4 barrel Holley 600. At idle she runs great but at higher rpms she starts to backfire. I just installed a HEI distributor and this is when I started having the issues. Do you have any thoughts?

[@jamesmarze9850]

Thank you tony!!! ;)

[@brettfrowde]

Your a legend

[@guitarprepnplus1]

Hi what about a flat spot at 4000 rpm? Then wakes back up. Advance sticking?

[@gordocarbo]

on a holley 850 front squirters is there supposed to be a checkball under the squirter or just that rod? Since carb was new d.side of the squirter dribbles then squirts. Changing squirters same thing. Im lost...thats my hesitation when I blip the throttle at idle.

[@Omar_torres]

Unlce tony. I have some carburator questions. Do you think i can send you some pics and where.... i have a 1998 ford festiva 1.3. As far as i know the carburetor is made by aisin. I have a small buy/hesitation when you barely tap on the gas. So it hesitate everytime you take off. Its only in the beginning. After that its fine and runs good after that.. i changed the accelerator pump thinking it was that but it didn't help much.. the carb has a knob and also a adjusting screw. Do ypu know where to start and how i can send you some pics of how the carburetor looks like

[@smrobinson6627]

I used a thompson power blast plate on a holley fixed my hesitation

[@1997LT1Camaro]

My holly six pack accel squirter doesn’t have the 3 holes. I noticed it has cam actuation, do you just replace the cam ramps for different levels of squirt aggression? Thanks

[@prayfawind]

my 4160 Cab on my 390 engine, i had to spray gas into the Carb for the car to start it wasn't spraying when you press gas, , i rebuilded the carb now it's spraying but now i have to press the gas to start the car once i stop pressing gas car turns off, any suggestions please?