J tubes
 

any issues replacing them on a holley

nope,they come out pretty easy.

Don't need them

Its my understanding you do ^^^^ in a marine environment.

Patients though. I use a little dowel or punch on the standard tubes and slip in so when you grip and turn you don't crimp the tube. Also reinstalling new ones I like to use a little blue loctite just to make sure they don't end up spitting out an exhaust valve or worse yet transferring from one bank to another. But like mike said they typically come out with a little twist and pull action.

Nope.
Not required

I have one on each carb that has a small crack, so for 30 bucks its piece of mind...........thanks guys

are you sure they are cracked,most have a slit or hole in them facing the carb in the middle of the bend.

ya Mike, its cracked up the side in the hole area, like it was pried up to straighten it

I bought an HP750 and a HP1000 cfm from AED, they turned the tubes 180 degrees with the small side facing the middle. They said the coast guard approved that setup.

Some of the rock crawler guys have a slightly different setup that accomplishes the same thing as the j tubes without the worry of siphoning fuel out of the bowls. If that's a concern of yours...

There is no USCG requirement for j tube carb vents.

Some of us tend to run like rock crawlers only at a much higher speed. I've been near every angle in and out of the water but not over backwards as of yet and only stuffed one boat. Lol. I like j tubes cause they make it easy to carry your carb. Hah

Even though there isn't a requirement for a j tube, there is a requirement that the carb not be able to leak fuel into the bilge. The Holley style vent system which would normally leak into the bilge accomplishes this by means of the j tube. Anyway that's my .02

Some people are concerned that the airflow by the j tubes will siphon fuel from the bowls even in an upright position. I don't know if this is a valid concern, but if it is the tubes the rock crawlers use prevents it.

Although was a big deal at one time to the CG I've yet to get cked for J tubes in over 30 yrs of boating and been stopped numerous times.

Here is exactly what the CFR reads:
http://i205.photobucket.com/albums/b...psjigjnwbq.png

http://www.uscgboating.org/assets/1/...YC.1002.01.pdf

It's all here. Start around page 40.

I think we get it VC. You've been doing your homework. What do they have to say about nude chicks aboard?

If it's stuck a little heat with a torch will get it moving...LOL.

So that would be float open and in the case of an electric pump it would be pumping for 30 secs?

The captain gets the right of first refusal.
It's all in the book john!

Bck, keep in mind the j tubes have windows in them to prevent fuel pullover/siphoning, unfortunately this is where the cracks originate.

I have to take a look a closer look at mine. This is the only pic I have and I don't see any windows.

I'm playin!!!

1, That's why I like Edelbrock. No gaskets below the fuel level and all of them are set up to dump down the throat without J tubes.
2, The race boat uses old style Holley 850's - 4150's. The front bowl's vent would dump outside the carb if over flowed so I did the J tubes on them just to be sure. Even the Holley 600 marine I'm using on my next project had J tubes because both vents on it would have dumped fuel outside the carb.