Carburetor leaking fuel!!!

[patrickt]

On second thought, pull the bowls off and inspect what it looks like in there and see if you have gobs of white crap peeling off the metering block. If so, replace it. If you have something that's making your needle/seat stick open, you have to at least look for what it might be. A stuck N/S can be a potential fire hazard. In my gallery I have pics of some of my metering blocks that the ethanol gas just ate to pieces, while other blocks seemed immune to ethanol.

[patrickt]

Here, this is what I'm talking about:

[SBSerpent]

I pulled the bowl off to inspect. The float looks fine and does not have a hole in it because I can shake it and hear no fluid inside. I submersed it in water and saw no bubbles. I then submersed the entire bowl assembly with float and needle into a glass bowl of water and the float closed the needle and stopped rising right where it should according to the sight glass. I blew into the fuel inlet with the needle open and then turned the bowl upside down so that the float closed the needle. Free flow of air with it open; no flow of air with it closed. The rubber conical stopper at the top of the needle looks fine.

Dunno, maybe by removing the bowl I dislodged whatever was keeping the needle open. Gonna re-assemble and see what happens. First need to get a new bowl gasket.

If I want to replace the needle/seat assembly, how do I figure out which one I need? Summit racing has tons on their website. Search by using the Holley part number?

[patrickt]

The rebuild kit will come with a couple of different N/S combinations. It will also have all your gaskets. On my Holley, two of the needle and seats looked like they were an exact match. One was .110 and the other was .097, but the instruction sheet that came with the kit indicated that the .110 was the correct match for a needle and seat marked with an “H” on it (which my needle and seat did). Here's a tip: Put a dab of Vaseline on the black O-ring; it makes the job way easier.

[SBSerpent]

Originally Posted by patrickt

The rebuild kit will come with a couple of different N/S combinations. It will also have all your gaskets. On my Holley, two of the needle and seats looked like they were an exact match. One was .110 and the other was .097, but the instruction sheet that came with the kit indicated that the .110 was the correct match for a needle and seat marked with an “H” on it (which my needle and seat did). Here's a tip: Put a dab of Vaseline on the black O-ring; it makes the job way easier.

Is there a specific rebuild kit that I need to order? Again, Summit Racing has lots of kits. My carburetor is a Holley Street Avenger series, p/n 0-83770.

[Gaz64]

I'd say it is a .110 needle and seat.

And this would be the whole kit you need:

https://www.holley.com/products/fuel.../parts/0-83770

Roll onto service parts, then down to 37-935:

https://www.holley.com/products/fuel...t/parts/37-935

[patrickt]

Yeah, that looks pretty good. Summit will have it at your door by Wednesday,
https://www.summitracing.com/parts/h...5/applications

[SBSerpent]

Originally Posted by patrickt

The rebuild kit will come with a couple of different N/S combinations. It will also have all your gaskets. On my Holley, two of the needle and seats looked like they were an exact match. One was .110 and the other was .097, but the instruction sheet that came with the kit indicated that the .110 was the correct match for a needle and seat marked with an “H” on it (which my needle and seat did). Here's a tip: Put a dab of Vaseline on the black O-ring; it makes the job way easier.

Why Vaseline and not just grease or a dab of oil? Is this to lubricate the new O-ring such that it slides easier into the chamber of the fuel bowl during installation?

[patrickt]

Originally Posted by SBSerpent

Why Vaseline and not just grease or a dab of oil? Is this to lubricate the new O-ring such that it slides easier into the chamber of the fuel bowl during installation?

Yes, lube up the O-ring so that it slides in and sits nicely. There's probably better lubricants, but I've used Vaseline on them since I was a young teenager (and I'm now in my 60's). It's never let me down yet.

[hauss]

Originally Posted by patrickt

Yes, lube up the O-ring so that it slides in and sits nicely. There's probably better lubricants, but I've used Vaseline on them since I was a young teenager (and I'm now in my 60's). It's never let me down yet.

I used vaseline on a rubber once now they call me dad.I would be very careful using it again . By the way you know what they call men how use the withdrawal method? DADS!

[Gaz64]

What fuel pressure do you run?

Can you see the seat size stamped at the top of near the flats?

Although your water test can give you a little idea, it doesn't compare, since fuel has a different density (lighter), the float is displaced at a different height.
Also fuel will creep past a bad needle, and past a bad o-ring.

Gary