I have a Holley list 9029, 4150 series marine carb that appears to be leaking from the idle adjustment needle seals and primary pump diaphragm. Can these be replaced by themselves or do I need a rebuild? The carb seams to work fine, it just leaks when the engine is off. I've never messed with a carb before, i usually just take em off and have them rebuilt but if I can just replace these parts i'll give it a shot.

Thanks,
James

you might as well buy a rebuild kit, it'll come with the seal.  chances are if those are dry everything else is too. its just a little cork deal...

I figured might as well get it rebuilt, no point in wasting $40 for a band aid fix. I've taken all my carbs to a shop in El Monte but they Quoted $180 for the Holley over the phone. Sound right? all my other carbs (Edelbrock & Quadra jets) were $130 

If your not in a huge hurry I'll rebuild it for you.  I'll be back in SoCal (Redlands area) Sunday late.  I'll do it for 40. Plus the cost if the kit.  I can get a quote for the kit before you decide.   Anyway, it'll take a couple days to get it apart, dipped and cleaned.  Then just a short time to reassemble.

Okay, Please don't laugh but I have not clue as to what I'm looking at
I've taken my carb off of the manifold and am trying to drain the fuel. On my Edelbrock I just moved the linkage until all the fuel squirted out and I was done. Moving the linkage on the Holley only squirts fuel out of the primary, the secondaries do not move at all. Is there suppose to be any linkage that attaches the two? Also if I move the secondaries by hand no fuel squirts out??? Now I've never even looked down a Holley let alone own one but I can't find the jets for the secondaries???  The only items I've removed have been the throttle cable and spring. I have taken some photos of the sides and top. Looking up the List# 9029 tell me this carb should be a 715CFM with mechanical secondaries. Can someone be kind enough to tell me what I'm missing or if I'm doing something wrong

Thank you in advance,
James

You have a vac sec carb there. If u want to drain it just turn it upside down.  The primary and secondary jets are in the metering blocks, same blocks where the idle mix screws are.  Take off the float bowls and youll see the jets...

In fear of sounding like a complete moron, how are the secondaries vacume? I don't see anywhere to hook up a vacume line, are they pulled open by the intake? Also, another dumb question but why wont the secondary jets spray when the linkage is moved? What are the jets under the phillips screw in the primary?

Thanks,
James

That carb has been rebuilt with a non Holley kit previously.  I would highly recommend getting a genuine Holley kit, but now you need to get the correct adjusting nut and jam screw for the needle and seat assembly. 

What's on there currently can easily cause you to damage the threads for the needle and seat (float adjustment).

but now you need to get the correct adjusting nut and jam screw for the needle and seat assembly. 
What's on there currently can easily cause you to damage the threads for the needle and seat (float adjustment).

Do these parts come in the holley renew kits?
Also, just curious, how could you tell it has a non Holley kit?

Do these parts come in the holley renew kits?
Also, just curious, how could you tell it has a non Holley kit?

1st question = NO

2nd question =  I could tell by the Jam nut on top of the float bowl.  The original Holley design uses a floating nut to adjust the height of the needle/seat and a flat headed bolt to tighten everything 

The aftermarket design uses a slot on the top of the needle/seat and a regular nut to jam everything together.  The problem is you can over-tighten the jam nut and pull the threads out of the float bowl 

The Holley kits do not come with the nut/jam screw in there kits because these are non wear items and shouldn't need to be replaced.

The good thing is the parts you need are the same on all Holley's that have that type of needle/seat.  So, you might be able to find some good used around (unfortunately I don't have any hanging around).

If not you'll probably have to go to a speed shop that carries more than a couple Holley gasket to get the parts you need.

Thanks everyone for all the tips and offers to help. I called the Carb shop back the other day asking if they had the OEM adjusting nuts and jam screws. The guy remembered me from the other day and asked if I was going to bring it in for a re-build and i told him I was expecting a price around $140, not $180. He then responded with "$140 is fine" So I decided to take it in. Got it back yesterday all nice and clean, correct adjusting nuts and jam screws, tuned,  W/ a 6 month warranty too

Thanks again guys

that thing looks bitchin.  hopefully it runs like a champ now.  did he happen to jet it and power valve it to your application? 

Here is a picture of the manifold:

And here is a picture of the gasket, you can see in the pic it does not cover the hole completely.


After a bit of research the gasket that was given to me is for a 350 not a 454 I talked to the wife and apparently the guy I talked to was out to lunch when she picked it up. She said some kid grabbed that gasket for her after she told him I had an adapter plate I'm pretty sure he will give me the correct one if I go back but I need this done  by Monday and the shop is only open while I'm at work. Does that gasket have to be 1/4" thick? can I just get a standard Q-jet gasket and cut the spread bore part out?

Looks like you need a new manifold. I have an edelbrock performer rpm air gap coated with endurashine. Thale manifold looks like its polished. Hit me up if you are interested. $250

Thanks for the offer, and i do plan on changing the manifold eventually but i need this boat ready to go by the end of Monday.

There has to be something out there, I know this because there was a nice thick gasket on there that covered those ports perfectly, but I threw it away hopefully someone knows...

maybe its just me but that is a quadrajet manifold and you have a 4150 carb.  two different configurations...

you need the correct manifold for your carb... the primaries on your carb will probably work but the secondaries wont.

I know it's best to match the carb to the manifold but this is how my dad set it up. Holley->Adapter->Manifold.
Why wont the secondaries work? This is how the boat has been since the 1980's without issue.