Holley Carb. 3367

[Matt B.]

I started up my 66 today and noticed fuel leaking profusely from the rear of the carb right where the fuel line tube enters the rear block. See photos. I removed the rear block of the carb to investigate. I thought I felt a crack under the tube housing but was mistaken. Any suggestions would be appreciated.

Thanks in advance, Matt

[Larry S.]

Re: Holley Carb. 3367

Maybe the small o-ring on the end of the fuel line tube. Replace it but use vaseline or a little oil to keep from ruining the o-ring during installation.

[Bill I.]

Re: Holley Carb. 3367

Where is the O ring It's not on the tube. Bill.

[Stuart F.]

Re: Holley Carb. 3367

I'm not that experienced with Holley's, but I did have a #4165 spread bore for a while and one of my pet peeves with it was the transfer tube O-Rings. The darn tube would work it's way out and I'd have gas all over the valley. True, a lot of the fault was mine because I tried to tune it with different jets and power valves as well as pump cams, etc.. Therefore, I had the sucker apart often. To me, I won't have any carb that has gaskets or O-Rings below the fuel level ever again!!! They are junk!

Stu Fox

[Clem Z.]

Re: Holley Carb. 3367

Where is the O ring It's not on the tube. Bill.

look inside the float bowl where the tube goes in. holley has a redesigned tube and seals that is much easier to install

[Larry S.]

Re: Holley Carb. 3367

Where is the O ring It's not on the tube. Bill.

Bill, it's either inside the float bowl (probably damaged or deformed) or it fell off when you removed the fuel tube. Like I said before, use care when installing a new one (lubricate it) or the fuel tube will destroy it.

[Clem Z.]

Re: Holley Carb. 3367

Bill, it's either inside the float bowl (probably damaged or deformed) or it fell off when you removed the fuel tube. Like I said before, use care when installing a new one (lubricate it) or the fuel tube will destroy it.

also put the "O" ring on the tube not in the float bowl when you install the bowls

[Matt B.]

Re: Holley Carb. 3367

Larry,
I found the o-ring still seated in the housing. I removed it and it's still soft and plyable. But I did not notice any movement in the plunger that the float pushed against. Should I be able to see this movement, or is it so slight you can't see it. Could that be the root cause of my leak instead of the o-ring? Or both? Is the plunger a part that's readily avaliable?
Thanks

[Larry S.]

Re: Holley Carb. 3367

Larry,
I found the o-ring still seated in the housing. I removed it and it's still soft and plyable. But I did not notice any movement in the plunger that the float pushed against. Should I be able to see this movement, or is it so slight you can't see it. Could that be the root cause of my leak instead of the o-ring? Or both? Is the plunger a part that's readily avaliable?
Thanks

Matt, that I don't know (either question). Perhaps another member does know. Sorry.

[Jim T.]

Re: Holley Carb. 3367

Larry,
I found the o-ring still seated in the housing. I removed it and it's still soft and plyable. But I did not notice any movement in the plunger that the float pushed against. Should I be able to see this movement, or is it so slight you can't see it. Could that be the root cause of my leak instead of the o-ring? Or both? Is the plunger a part that's readily avaliable?
Thanks

Matt I believe you are talking about the needle and seat. If there is debris stopping the needle from seating, the fuel bowl will spill. Just take it apart and examine.

[Matt B.]

Re: Holley Carb. 3367

Matt I believe you are talking about the needle and seat. If there is debris stopping the needle from seating, the fuel bowl will spill. Just take it apart and examine.

I do not see any debris but I also do not see any movement in the needle valve. See photo. Looks like my problem is a sticky needle valve. Could this cause the fuel to leak out the fuel feeder tube? How does that needle and seat piece came out so I can replace it.
Thanks again.

[John M.]

Re: Holley Carb. 3367

Matt,
Remove the screw on the top of the bowl and then turn the nut on the needlevalve counterclockwise until it comes out the top. Check it, clean it and replace. But, if the fuel was coming out of the transfer tube boss it's either the o-ring or the tube.

[Matt B.]

Re: Holley Carb. 3367

Thanks, I will give it a try when I get home from work.

[Bill I.]

Re: Holley Carb. 3367

Matt, suggest you go to vintagemusclecarparts.com, click on the tech section on the left, It will be a BIG, BIG help. Bill.

[Matt B.]

Re: Holley Carb. 3367

Bill,
I got the sticky needle valve and seat out in less than 30 seconds after reading the link you sent me. I'll be heading out to the auto parts store tomorrow at lunch to pick up a rebuild kit. I think the needle valve stuck filling up the secondary and leaking out the top at the fuel tube. I plan on replacing the valve and seat as well as the fuel tube o-rings. Thanks for the info.
Matt