Question about Harley Davidson Harley-Davidson Motorcycle Desktop Telephone

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1200 sportster gas leak

I have a leak at the bottom of the petcock. It looks like a small breather hole.

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  • teksus May 02, 2009

    I have a 1997 Harley 12 Sportster that also has a similar gas leak. The gas comes out of the little petcock behind the fuel line and it only leaks when the engine is on and running. I thought it was becuase there should be a hose attached to it so that it would leak on the ground. Not really sure what to do, I think it may be an easy fix.



  • teksus May 11, 2010

    97 1200 sportster gas coming out of the petcock while driving?

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2 Answers

Did not say whay year but hd went to a vacumn activated petcock to shut the fuel off for you when you kill the engine. the little pinhole is the pressure equalizer for the diaphram so if it leaks, the diaphram has a hole in it. not sure but hd might make a rebuild kit, if not, i would replace it with an aftermarket without the diaphram shut off. you just have to remember to manually shut the fuel. you will also have to plug the vacumn line. why i suggest this is if you are wot too long the loss of vacumn signal will shut the fuel off and cause a lean condition which will increase combustion temps.

Posted on Aug 13, 2008

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You will need a new petcock. The internal seals are gone.

Posted on Aug 06, 2008

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Hi: My 2004 Harley will only run when leaving choke on, as soon as I push in choke the bike shuts down, also backfires when giving it gas when choke is still on, do you have any ideas what maybe causing...


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1 Answer

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02 sportster 1200 brake light not working


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Front suspension on a 1968 sportster


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Hi,

Have not worked on an HD but my thoughts and additional guesses would be:
1. fuel contamination (water at bottom of tank);
2. primary pump (in my case it was inside the fuel tank & might not be present in your bike);
3. fuel lines & clamps to & from primary pump or to the carbs;
4. in line filters;
5. vacuum controlled fuel valve (oppose to the usual manual petcock)
6. if it were the MAP sensor, bike wouldn't even run a block away + idling would be rough;
7. by chance are you using a Power Commander?

Also your post "bike will start and run fine for a few blocks then die" indicates that indeed fuel got into the carbs before but not when running meaning the bike used what was inside the bowl and was not replenished.  Alternately, the fuel flow to the carbs might not be sufficient and there is a leak or a blockage somewhere.

As said might not work for your bike but has come across some of the above on numerous occasions.

Good luck and Kind regards.

Ride Safe.

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