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Anyone know of a high quality vacuum petcock?

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I had a bad petcock. Fuel came out of the vacuum line. No big deal. Replaced the petcock with https://www.amazon.com/Petcock-Assembly-Suzuki-GS1000-44300-44011/dp/B01N6RD8BA. Now that one wants to shut off every other time. And went it does not. Fuel comes out the carb over flow tubes. I want to paint the bike. But, I do not
trust a $16 petcock on a $1000 paint job. Do the Pental vacuum petcock work 100% of the time? Or does anyone else know of a vacuum petcock with an off switch? All the vacuum petcocks that I have seen are RES/ON/PRI. So if the petcock leaks there is no shutoff.
 
The OEM Suzuki petcocks are fine. The don't have an OFF position but it doesn't matter. Check Parts Outlaw for a good price.
 
Thanks for the tip on the price! Still $300. But, I will give it a go.
 
I've bought two petcocks from Georgefix on Ebay.... And compared them in detail with the originals... They appear to be identical so I suspect he uses whoever is supplying Suzuki... If he has the model you are looking for he is cheaper.......
 
I agree ...Georgie's petcocks look good..mine had a better casting finish than the original unit - likely due to improved manufacturing techniques .
 
I bought a George petcock that looked identical to the OEM...only it failed right away. It was the leverless version with the check valve in the back cover (check valve didn't work).
 
Steve said:
Give us a clue what bike? :pray:

.
Click to expand...

He must be looking for a petcock for a 1000.

Although the link shows one for 60 bux, I don't believe it will fit the 1000 model. I could be wrong though but when I looked, it seemed like it was a no go.

Personally, when the time comes to replace mine, I think I will go with the Pingle. Can't see 300 big ones for an OEM.
 
tom203 said:
Parts outlaw shows one for gs1100e for about $100
Click to expand...

That's a different p/n than the one he linked to in post#1. He is looking for one for a 79 GS1000.
Not sure what the difference is, but if the one for the 1100E will work, then I had better buy one.

I based my assumption on the fact that in post #3 he mentions $300 for OEM.
 
Last edited:
That is correct. I have a 1979 GS1000EN. The spacing between the mounting holes is 44mm. In 1980, I think they when to 34 mm. In any event, my $16 petcock that is an OEM replacement is still leaking. I checked the carbs and it was #2 that was leaking. So, pulled the carb and compared #1 and #2 (#1 was not leaking so I was using it for reference). Looked at the float height, needle and etc.... All looked good. Put it back together and it did not leak! Filled the gas tank to the top and put it on PRI and #1 started leaking!!!!! WTF. So, I might have switched one part in number one and to number two. Next I am going to put parts in #1 (float, needle and etc...) in number two and see if the leak moves back to #2. But, during the troubleshooting I installed a manual shut off in the fuel line. I am glad I did. I shut it off and I am going to work on it next weekend. Fixing this should not be this hard. Even when I get the new petcock, I think I will keep the shut off valve in place.

This is my first classic bike. I knew what I signed up for. It is a challenge.
 
Just got my Suzuki OEM petcock. I took it apart. The guts are different from the $16 one. For example, the rubber washer on the end of the stem that plugs the hole when the bike is off. Completely different. The plastic stem tower that did not have a hole in the $16 one; has a hole in the Suzuki OEM one. The outside of both petcocks look the same. I will update the thread once it is installed. They do not make Suzuki OEM petcock anymore. But, hopefully Suzuki makes a rebuild kit for it with OEM parts.
 
Put the OEM petcock in. Problem solved. Just finishing out the thread. If you need a new petcock buy a OEM rebuild kit. The $16 petcocks on ebay ones are junk. My bike still leaks when I have it on PRI when it is parked in the garage. But, I think that might be the float needles. That is my next project.
 
If you really want the problem solved, don't leave your bike parked with the petcock on PRI. PRI (prime) should only be used to fill the bowls after the carbs have been serviced or the bike has been sitting long enough for evaporation to occur. You should only leave the petcock set to PRI for about 30 seconds or so, then turn it to ON or RES. The float needles were never designed to hold fuel back while the bike isn't running.
 
blittlej said:
Put the OEM petcock in. Problem solved. Just finishing out the thread. If you need a new petcock buy a OEM rebuild kit. The $16 petcocks on ebay ones are junk. My bike still leaks when I have it on PRI when it is parked in the garage. But, I think that might be the float needles. That is my next project.
Click to expand...
It is most likely the o-rings around the needle seats. They keep gas from bypassing the needle and seat. Get an o-ring kit from cycleorings.com.
 
jsandidge said:
If you really want the problem solved, don't leave your bike parked with the petcock on PRI. PRI (prime) should only be used to fill the bowls after the carbs have been serviced or the bike has been sitting long enough for evaporation to occur.
Click to expand...

The OEM ones work fine, as long as you follow the above advise.
I rebuilt the OEM a couple times then got a different petcock (non-vacuum).
 
Aaaah good to know. So, there is nothing wrong with the needles. The PRI position was not designed to do that.
 
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