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Where is the main fuel line intake on my holly 4 barrel carb?

I need to know where my main gas line hooks to the carb my old 2 barrel had a screw on gas line but on the new carb its akk hose hook ups

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If it has a hose hookup you attach it there with a clamp or if you do not have the proper fitting or fuel line end you will have to get the proper parts.

Posted on Dec 14, 2014


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1 Answer

How do I tell if my 57 Thunderbird is a 2 or a 4 barreled carb

Hi Holly:
- Remove air filter from top of carb.
- Look down at top of carb
- 2 holes (2 barrel)
- 4 holes (4 barrel)

Aug 28, 2015 | Cars & Trucks

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Car coughs when I step on the gas

One possible issue is the carbs are not staged. In most cases one has to be delayed from the other depending on the configuration of the intake manifold.
Another possible issue could be not enough accel pump travel or too late. Not enough fuel coming thru the accel pump circuit on one or both carbs.
Either way, its probably too much air and not enough fuel in the mix.

Feb 15, 2014 | Chevrolet Camaro Cars & Trucks

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Holly 4 barrel the 4 barrel will kick in untill the vechal is got a little speed up then it kick up hard i need it from the start

Sounds like you plunger is not working rt. may need a carb kit. good luck.Could try some carb spray in your carb.. or another possability is you got some bad gas somewhere, .

Mar 26, 2011 | 1982 Ford F 150

1 Answer

Ive rebuilt a holly 4 barrel carb and the floats have been adjusted right and its leaking between the intake manifold and the bottom of were the carb connects to the intake.what is the cause of that?

You have to have a carb base plate gasket. Mr gasket makes a decent product that i currently use on my 84 F150. remove your carb and inspect the base of it, remove any debris that may be causing it to not seal properly. good luck

Dec 28, 2010 | Ford Merkur XR4Ti Cars & Trucks

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77 malibu, 305 cid, HEI, 2 barrel rottenchester, hesitates on acceleration, sucks the gas, if you let up on the gas is catches, also in park you can step on the gas and it wants to die, once is passes...


Well, I suggest that you do consider pulling the intake manifold. the plugged passageway serves another purpose: to heat the intake manifold, and that helps the fuel vaporize. This job is ugly, but necessary.clean the passageways in the heads also.

Your main complaint, however, sounds likd an accelerator pump issue. When you press the trhottle, a dual squirt of fuel is to be discharged into the venturi of the carb. This little squirt is to feed fuel until air flow increases and fuel is pulled through the off idle circuit and the main circuits. Typically, you just need to rebuild your carb. A trick is to be certain that the inlet and output check valves are sealing, I usually use the old ball bearing (steel ball) and tap it in it's seat, then discard that bearing and install the new one. Usually the pump fails, but if the checkballs leak, you get fuel on 2nd press and not the first press of the throttle. You need it on each and every press....
Most people dislike rochester because they are complicated, but you can dial out most any problem, as they are so complicated, although the 2 bbl is tons simpler than the quadrajet.

My thought is the accelerator pump circuit...Observe it closely.

Nov 08, 2010 | Chevrolet Malibu Cars & Trucks

2 Answers

*UPDATE* 1984 Mustang Won't stay running


You need to check if the Idle control jets are set properly, these are the 2 screws near the base plate on this type of carburettor.

Screw them fully in, then on the primary side screw it out 2.5 turns.
On the secondary side screw this out 1.75 turns. This should get your idle up.

If this dosn't work then you have got problems with the idle jet system which means you need to pull the emulsion tubes out and jets out to clean them.

Also check that your Idle screw is screwed in enough to allow the throttle to be open enough to idle.

Hope this helps



Jul 15, 2010 | 1984 Ford Mustang

2 Answers

I need to adjust a carberater and get the 4 barrel to start working

Most likely you have a Holley carb. You may have a 460 engine. If you have the carb with a big vacuum pot in front of the carb, then you have a RPM governor. The RPM governor will work against the 4 barrel.

The main mixture for the idle jets can be adjusted like any old style carb. You may have plastic caps over the idle screws but take them off. Then use a vacuum gauge on any intake fitting and proceed to read the vacuum level as you turn the mixture screws. You want the mixture to reach a maximum RPM, then evenly turn the screw in until the RPM drops slighty and then balance for smoothest idle.

After this step adjust curb idle and see if this helps when the 4 barrel kicks in. Holley has different springs for the vacuum actuated secondaries and they are color coded. If the carb is original it should be right, but if the carb is of unknown origin you can check the proper vacuum spring, main jet, power valve and so on in a good Holley book. The mechanical secondaries are also listed with clearances to hand adjust.

By adjusting the mixture screws you have set the engine to idle just below peak vacuum pressure. This means you should have more vacuum to work the secondaries.

Feb 16, 2010 | 1983 Ford F 350

1 Answer

1961 t-bird carb adjustment

run both screws all the way in and twist back out 2 turns on both. then work with how the car smells. you can tell to rich or not

Feb 12, 2010 | Ford Thunderbird Cars & Trucks

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Carberator problem - holly carb on chevy 350 motor

You are correct, there is a float inside a holley 4 barrel fuel bowl.
Is the electric fuel pump regulated? If the fuel pressure is above 8 lbs, you could run into this issue or the float / needle / seat could have a problem or miss adjusted.

By the way, a 2007 GMC is not carbureted so I assume this is not the vehicle or it has been modified.

Good luck.

Apr 27, 2009 | 2007 GMC Sierra 1500

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