351 w/ Holley Carb 4160 - fuel inlet leakage

Ken and Pete have it covered. I'll add that proper tools are key for getting these joints to be leak free. The adapter is 1" and can be done with a thin adjustable, but a relatively thin 1" open ended wrench is preferred. For the flare fitting, you'll want a true fuel line wrench- 5/8" is most common. (This will prevent further damage from tightening with a typical open end wrench). Amazon sells a set with various sizes for pretty cheap (<$15).

You want to tighten the adapter to the bowl first, then finish torquing the flare fitting into the adapter last. While doing the latter, you'll want to hold the adapter in place with the 1" wrench (putting pressure in the direction that would loosen it in the carb bowl, to prevent it tightening along with the flare fitting). Both pieces need to be pretty tight to keep the joint leak free.

Here's a link to what you're probably calling Bolt A. Uunless somebody really mangled it you shouldn't need one unless you just feel like spending money
link

You should just need the gasket that Pete gave you a link to. It goes between the Adapter and the fuel bowl.

The flare nut threads into the adapter with no gasket or sealer or anything,

Do it the way Pete said.in his post

There is no gasket because that is a flare fitting and the nut tightens down on the flared end of the tubing to provide the seal with the mating surface inside the adapter.

it'll hold a lot more pressure than a carburetor ever sees.

Edit   I see that I gave you a link to what you're calling Bolt B and I'm calling Bolt A so I don't have a clue what you're calling Bolt A.

A picture sure would help right about now

Hey guys

I'm having some fuel leakage where the rigid metal fuel line (connecting the fuel pump to the carb) is leaking carb-side. Before I mention where it's leaking, here's how I (an unexperienced mechanic) see the pieces fitting together (parts below listed in order moving from the carb to the fuel line):

- Carb fuel inlet
- Bolt A - screws into the carb inlet at what I think is 7/8" or 1" ( can't find a link to this part; anyone know of one? )
- Bolt B - screws into Bolt A at something smaller ( http://www.skidim.com/images/R024025.jpg )
- Gasket - attaches to Bolt B ( between Bolt B and Bolt A; or Bolt B and the fuel line? )
- Fuel line - screws into Bolt B

So my issue is that I have slight leakage (1 drop every 20 seconds at 1,200 rpm; I found this while warming the engine up) that appears to be coming from between the carb fuel inlet and Bolt A. I had this issue a couple weeks ago and I was able to tighten Bolt A or Bolt B (can't remember which one actually tightened) and the leak stopped.

Bolt B is brass and looks pretty chewed up from where a previous owner probably tightened it as well. I'm wondering:

- Has anyone had this issue before? Where was the leakage?
- What side does the gasket go on (Bolt A side or fuel line side)?
- Should I just replace Bolt B and the gasket?
- Can anyone link to somewhere I can buy Bolt A?

Thanks!

--Chris N.