Gas leak at petcock

[Skipper]

A little history first...  I've had the bike a couple months and it has a belly tank from R&M works. My understanding is the petcock was altered by removing the guts from the OFF side of petcock. My first question is concerning the fuel line that drains the fuel from tank to belly tank. There is no clamp on it and i'm wondering how it unhooks from tank. It has a yellow ring in the very end of hose. I need to know if i can just pull it off or is there some trick to removing.
 I have developed a gas leak at the petcock. Its a constant drip bout every 15 to 20 seconds.
  Can i remove petcock without removing tank? Since it's set up to flow in the off position "bellytank"  what to you think would be leaking?
 Thanks for any info  
    
 Forgot to ask "if" the petcock is really serving no purpose other than still being able to have a reserve, could i do away with it   

[Ricky-D]

If the off/on side of the petcock function has been removed, you have also lost the reserve function.

If it's non-functioning right now, then I can't see any reason for having it and a simple petcock would suffice..

Look carefully at where it is leaking.

There is more than one place the petcock could be leaking.

I'd suggest to have some way to stop the gasoline from flowing from the tank.

***

[Farther]

I have a R&M belly tank too.  Your petcock retains the reserve function.  I don't have a specific answer to your questions bu this is a good place to start for your answer:  http://www.rmworksinc.com/Information.html

[Gryphon Rider]

If fuel is leaking from the little vent hole at the bottom of the valve, the fuel diaphragm inside the valve needs to be replaced. Whenever I've had my valve off I also had the tank off and I don't know if it's possible to leave the tank on.

[Skipper]

Fuel is coming from top of petcock and running down back side

[ptgb]

A little history first...  I've had the bike a couple months and it has a belly tank from R&M works. My understanding is the petcock was altered by removing the guts from the OFF side of petcock. My first question is concerning the fuel line that drains the fuel from tank to belly tank. There is no clamp on it and i'm wondering how it unhooks from tank. It has a yellow ring in the very end of hose. I need to know if i can just pull it off or is there some trick to removing.

It threads into the fitting that was welded into the tank. Should be a brass-colored fitting above the yellow ring. Wrench to take it off.

Here is a link to my write-up on my belly tank install:

http://www.valkyrieguy.com/bellytank.htm

The petcock was modified to to be "open" all the time as it is now used as a vent for the belly tank. It becomes a simple valve that is only used to drain the "reserve" fuel down to the belly tank. When you turn it to reserve, it simply drains the remaining fuel down to the belly tank and then it becomes a vent again no matter what setting it is left on.

I have developed a gas leak at the petcock. Its a constant drip bout every 15 to 20 seconds.
 Can i remove petcock without removing tank? Since it's set up to flow in the off position "bellytank"  what to you think would be leaking?

Sounds like it is leaking at the point where the petcock threads onto the tank. I would take it off and check the threads, etc.  
    

Forgot to ask "if" the petcock is really serving no purpose other than still being able to have a reserve, could i do away with it  

It does serve a purpose; 1st, as vent to the lower tank, and 2nd, and more importantly, it still retains to reserve function for the Valk, if you run it without petcock you will lose reserve fuel.

The petcock is modified by moving the spring to the other side of the diaphragm to hold the diaphragm open all the time. The vacuum function to hold the diaphragm open is no longer needed or used.


Here's a link to Instruction Manual for the Belly Tank directly from R&M. It should answer most of your questions better. Also has the instructions for modifying the petcock if you have to get a new one or re-build the one you have.

http://rmworksinc.com/files/Belly_tank_instruction_manuel-pdf2.pdf

[Skipper]

Thanks for the help so far.  I have the tank off and the petcock out. There is some evidence it could be from the top of petcock as ptgb suggested. I have cleaned it up and the O ring shows no sigh of damage. If i reassemble, plug gas line and put it back on tank and add 2 gal gas i should be able to tell if this was it??

[Skipper]

Fuel hose from petcock to belly tank is rotten. Gonna shut down till i can get into town and get more fuel line

[Skipper]

New O ring in top of petcock and vent hose to belly tank and i'm leak free Thanks for the help folks

[Skipper]

I'm back to the start    same leak. Lasted 2 days and 115 miles. Can someone tell me where the O ring in the top of petcock is supposed to be. The one that was in it when i removed it was down in the petcock. There is a gruve cut out  where the plastic pipe coming from tank sits down in the petcock. The O ring was too big around to sit in the gruve so i slipped it over the end of plastic pipe as it seemed to be perfect for that. Must sit in gruve, if so i will need a smaller O ring

[custom1]

It goes around the end of the plastic tube/screen. And the screen fits down in the groove just like you said. Maybe the o-ring is bad or one of the surfaces is nicked. The screen/tube usually is stuck in the tank. Mine was and I buggered it up with a punch and some vice-grips getting it out. The best way to reassemble is to get a new screen and put it on the petcock, in the groove, with a new o-ring around the bottom of the screen and then put the whole assembly back it the tank.

Not my pic. I borrowed it from someone on here. The arrow is where the o-ring goes.