At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
Re: where is the main fuel line intake on my holly 4...
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.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
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.
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, .
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
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.
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.
I have ran into this frequently.1984 ford,if it is a california vehicle,had a feedback carb.(electronic feedback control) with a computer. and they had 49 state vehicles. The 49 state vehicle is not electronic feedback. if the intake has been changed, it's going to be hard finding the right carb for it. a 2bbl won't fit a 4bbl manifold. Holly carb makes a replacement carb to fit many vehicles. check with your local auto parts person. they should be able to help you, or find one in the wrecking yard with everything to swap it out.
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.
×