• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Clear vinyl tubing on vacuum-petcock - bad idea?

  • Thread starter Thread starter WilliamGLX81
  • Start date Start date
W

WilliamGLX81

Guest
Howdy folks.

Since I replaced the petcock diaphragm and rebuilt it (successfully) and had the carbs off, and used clear vinyl tubing to build a carb-balancer, I figured vinyl tubing for the petcock's vacuum line might be great.
I noticed the vinyl is pretty stiff. I'm wondering if I might be getting air leaked into the intake between the vinyl and the nipples because it's a somewhat rigid material.

Has anybody confirmed this?
 
get the pipe nice and warm with a heat gun or similar so its nice and squidgy and flexible when you push it over the nipples. when it cools it will form a nice tight seal
 
It will work fine for a while. Could be helpful to see if the diaphragm is leaking.

Maybe not so good long term.
 
UK insurance companies can refuse to pay out in the case of fire if the fuel pipe is not rubber, the theory being that anything else gets warm and can sag or change, rubber will not. Just sayin..
 
Well, he's not in the UK, but I tend to agree with the concept.
icon_thumbsup.gif


As mentioned, you might use it short-term for some diagnostics, but please use the proper stuff for long-term. :o

.
 
tatu said:
UK insurance companies can refuse to pay out in the case of fire if the fuel pipe is not rubber, the theory being that anything else gets warm and can sag or change, rubber will not. Just sayin..
Click to expand...

but its only the vacuum pipe, unless he has petcock problems, there wont be any fuel running through it.
i have used the same pipe on my vacuum tap for years. i also use clear fuel pipe as well, so much easier to diagnose any fuel feed problems
 


I like Tygon (sp?) fuel line.Would not use vinyl line.Might be a few $$ more but well worth it.Get mine at the small power equipment store in town.
 
Vinyl tubing is a bad idea since it's not fuel proof. Get some tubing rated for use with gasoline and you should be good to go.
 
Best way to tell if the fuel tap is leaking gasoline into #2. we use extra battery vent tubes at the shop.


WilliamGLX81 said:
Howdy folks.

Since I replaced the petcock diaphragm and rebuilt it (successfully) and had the carbs off, and used clear vinyl tubing to build a carb-balancer, I figured vinyl tubing for the petcock's vacuum line might be great.
I noticed the vinyl is pretty stiff. I'm wondering if I might be getting air leaked into the intake between the vinyl and the nipples because it's a somewhat rigid material.

Has anybody confirmed this?
Click to expand...
 
if you think the valve is leaking fuel into the #2 port...
put a cap on the carb and run the bike on prime and see if it runs better.
check the vacuum nipple for fuel drips when running.
simple???
 
1) This is for the vacuum line, not the fuel line. I have "proper" black fuel line for that, but it's getting stiff on me. I might switch it to some of the clear fuel line that weedwhackers, etc. use.
2) I went to switch out the vacuum line yesterday, but the tubing I bought was too big. Does anyone know the diameters for the lines? I've seen them around, but can't remember what they were.
3) The vinyl does seem to be sealing pretty well, given that the spit I put around both ends of the fitting wasn't getting sucked in. I just thought it would be useful for the future in case the petcock leaks again. It doesn't leak anymore since the rebuild.

The reason I was asking is I was missing on #2. Turns out I've got a leaky intake boot or o-ring. I'm hoping I just squished the o-ring on installation when I replaced it, but I'm not holding my breath. Neither is my bike heh heh.

Cheers
 
WilliamGLX81 said:
Does anyone know the diameters for the lines?
Click to expand...
Would you believe that a quick peek at the parts fiche will tell you the answer?
icon_shrug.gif


The vacuum hose part number is 09355-45855-600. Looking at the second half of the number (after the "-"), it tells you that it is 4.5mm inside diameter, 8.5mm outside diameter, probably from vendor #5, and is 600mm long (quite a bit more than you need).

The fuel hose part number is 09352-70103-00B, which tells you that it is 7mm inside, 10mm outside (from vendor #3?). The length is not given in the part number, but I have received about 2 meters (6 feet) of it when I order it.

.
 
Tygon works great in just about any application and will resist just about any chemical. It stays flexible for a long time and you can also see readily if you have fuel flow.

:dancing:
 
I use a clear fuel rated vacuum line, though the main fuel line is black fuel rated.
 
tkent02 said:
Does this stuff tend to kink if you bend it or can you curve it around under there without problems?
Click to expand...

It's very supple, yet the tubewall thickness is heavy enough so that it isn't kinked on any of my bikes.

I buy the stuff in 10' lengths from him and cut it to size when I replace the lines on a "new" bike.
 
Tygon is not a single type of plastic. It is a brand name for a variety of polymers or polymer mixtures. Many of tygon branded polymers are fuel resistant. Some of them might not be. Some of them are also heat resistant, but not all.
 
You must log in or register to reply here.
Back
Top