Author Topic: Petcock question  (Read 4854 times)

Offline WTexCliff

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Petcock question
« on: July 10, 2012, 06:45:53 pm »
Hello, I have a question about the Petcock on my 2004 that I can not seem to find any reference to in the forum.  I was replacing a fuel hose because the one I had started kinking and cutting off the fuel.  Once I had it installed, I switched the petcock to prime to see if there were any leaks.  (I have overflow tubes.)  I noticed a couple of drops on the engine about one third from the left side.  After checking to see if the connections were tight, I turned it to prime again with the vacuum hose disconnected at the petcock.  I found gas dripping out of the vacuum line connection on the petcock.  I am not very experienced with this but this seems wrong.  Do I have a defective petcock or am I missing something here.

Thank you

Offline redzgrider

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Re: Petcock question
« Reply #1 on: July 10, 2012, 06:48:53 pm »
Sorry buddy, but that's a problem. There is a diaphram ported to the intake, that pulls a shaft with an o-ring. The o-ring pulls from a seat, and fuel flows. If there is fuel coming out of the vacuum port, then the diaphram is leaking. At the very least, you'll be runnning a tad rich...

Offline WTexCliff

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Re: Petcock question
« Reply #2 on: July 10, 2012, 06:55:57 pm »
Thanks for responding.  Now that I know that there is a problem I should probably go to Murph's for a new petcock.

Offline JDM

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Re: Petcock question
« Reply #3 on: July 10, 2012, 09:44:03 pm »
If you have overflow tubes why not just get Murphy's manual conversion kit for the petcock and eliminate the vacuum connection altogether.
If you have seen heaven, I am sure something scared the hell out of you.

Offline T Cro ®

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Re: Petcock question
« Reply #4 on: July 11, 2012, 03:55:25 am »
If you have overflow tubes why not just get Murphy's manual conversion kit for the petcock and eliminate the vacuum connection altogether.

Murph's Manual Conversion Kit is not going to cure a leaking petcock thus if the cock is leaking fuel you will need either (A) Rebuild Kit or (B) Replacement Petcock as well as the Conversion Kit if so desired. If going manual was the intent I would rather invest in a Pingle Petcock over another OE unit; better flow with a more positive shut off design.
Tony P. Crochet
(SOLD) 01 Concours Winner of COG Most Modified in 2010
Ask me about a set of Stick Coils & Harness or Precision Shift Linkage for your C10 Concours

Offline WTexCliff

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Re: Petcock question
« Reply #5 on: July 11, 2012, 10:24:52 am »
I ordered a new petcock from Murph's but I doubt I will stay with it long.  I considered the leak through the vacuum port on the petcock and the fact that the port enters on the engine side of the carburetor.  Not knowing how much gas had dripped in and determined to not be the first person to have overflow tubes and hydrolock, I pulled the plugs and turned the engine over.  I am glad I did, although I was not ready for the face full of gas that came out of the number 2 cylinder.  I guess I will give it a while to let the rest evaporate.

Seriously, I am thinking I would rather trust myself to turn the gas off more than a small rubber diaphragm.

Offline Vic Salisbury

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Re: Petcock question
« Reply #6 on: July 11, 2012, 10:36:40 am »
Murph has that new manual conversion

http://www.murphskits.com/catalog/product_info.php?cPath=1_94&products_id=483

and this conversion disables the diaphram side of the petcock and the petcock is completely manual, Off-On-Reserve
 It includes a new lever, back plate, all the sealing orings. A very nice set-up, works and looks great! 
Vic Salisbury
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Offline T Cro ®

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Re: Petcock question
« Reply #7 on: July 11, 2012, 05:28:32 pm »
Murph has that new manual conversion

http://www.murphskits.com/catalog/product_info.php?cPath=1_94&products_id=483

and this conversion disables the diaphram side of the petcock and the petcock is completely manual, Off-On-Reserve
 It includes a new lever, back plate, all the sealing orings. A very nice set-up, works and looks great!


Yes that is indeed a very nice set-up... I wonder what happened to the Bergman unit that he used to sell? This one may indeed address a leaky cock as well as converting to full manual.
Tony P. Crochet
(SOLD) 01 Concours Winner of COG Most Modified in 2010
Ask me about a set of Stick Coils & Harness or Precision Shift Linkage for your C10 Concours

Offline WTexCliff

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Re: Petcock question
« Reply #8 on: July 11, 2012, 06:34:59 pm »
Thanks for everyone’s comments.  I will probably end up getting a pingle petcock in the coming month or two.  Based on the directions in the COG Tech pages, it seems the most challenging part is carefully enlarging the opening in the gas tank slightly.  The conversion kit from Murph’s looks good and I am a little squeamish about assembling my own.  I like the idea of just plugging in the pingle and having it work.

Thanks

enim57

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Re: Petcock question
« Reply #9 on: July 11, 2012, 07:43:41 pm »
Mine started leaking again for the second time so I converted it to manual by my own methods, very simple and can be converted back to original. It still has on/reserve/off positions. The rubber boot to block off the vacuum port on the carburetor is part number 92068-006.

Back in the "good old days" they were all manual and I didn't have any leaking or hear of hydrolocked engines. My other bike has a manual fuel tap and I haven't forgotten to turn it off, I guess old habits die hard.

Regards, Russell

Offline jim snyder

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Re: Petcock question
« Reply #10 on: July 11, 2012, 07:49:51 pm »
Thanks for everyone’s comments.  I will probably end up getting a pingle petcock in the coming month or two.  Based on the directions in the COG Tech pages, it seems the most challenging part is carefully enlarging the opening in the gas tank slightly.  The conversion kit from Murph’s looks good and I am a little squeamish about assembling my own.  I like the idea of just plugging in the pingle and having it work.

Thanks

Hey WTex,
  Don't hesitate to do the Pingel install. I have been running the Pingel fuel valve
on my Connie for 3 years, and ran them on my dragbikes for 20 years. They are
quality units that will last longer than your bike. You can look at my webshots page titled "Pingel install" to see how much needs to be filed out.
"Somedays you're the windshield, and somedays you're the bug"
"An armed citizen is a patriot, and unarmed citizen is a victim"

http://community.webshots.com/user/kawadude

Offline Nosmo

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Re: Petcock question
« Reply #11 on: July 11, 2012, 08:46:45 pm »
Pingel.  Mine is a different P/N than Pingel recommends for the Connie, I just had to be dfferent.  Get the one they recommend, and you'll be happy happy happy.

And overflow tubes.

 8)
A life undreamed is a waste.  A dream unlived is a sin.

Offline JDM

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Re: Petcock question
« Reply #12 on: July 12, 2012, 06:44:51 am »
Thanks for everyone’s comments.  I will probably end up getting a pingle petcock in the coming month or two.  Based on the directions in the COG Tech pages, it seems the most challenging part is carefully enlarging the opening in the gas tank slightly.  The conversion kit from Murph’s looks good and I am a little squeamish about assembling my own.  I like the idea of just plugging in the pingle and having it work.

Thanks
I am sure you will not have any problems, and you will save your self a lot of money with the Murphy kit, and it comes complete and ready to install.  If you mess up on enlarging the hole in the gas tank you are SOL.  The tank is very light gauge materiel and to be safe you should do the enlarging by hand "no sparks".  HTH JD     
If you have seen heaven, I am sure something scared the hell out of you.

Offline RedEX

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Re: Petcock question
« Reply #13 on: July 18, 2012, 08:54:06 pm »
I'll second the Murph's replacement petcock.  Easy installation, no problems, works great.  I was really worried about any hydrolock problems, since when I bought the bike, the original petcock had been left in the prime position.  I've also had problems with the EX500, had to rebuild the petcock on that one after I noticed the oil level rising in the sight window.  So, call me superstitious, but now I always turn the fuel off when I turn the bike off.   Well worth the peace of mind. 

Offline WTexCliff

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Re: Petcock question
« Reply #14 on: July 23, 2012, 07:31:04 am »
I finally got the pingle in and installed.  Everything seems to be working great.  I even got up the ambition to install Snarf's block off plates.  That only took about ten to fifteen minutes.

Thanks everyone