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Restrictive petcock

  • Thread starter Thread starter mixongw
  • Start date Start date
prism4 said:
Okay I went and got a rebuild kit put it all together and still have the drips?? I applied vaccum to the line and it does not hold. slowly escapes. What should it hold at?
Click to expand...

Then you either damaged the new diaphragm, don't have it installed correctly or something else weird? If you replaced all the rubber parts in the valve with new then you should be done.

Check your work. You say you apply vacuum and it doesn't hold? How are you doing this? Are you maybe applying too much and damaging it?
 
I've noticed a couople of things in repairing petcocks.

1) Some are beyond repair - the wear and tear on the petcocks results in worn metal parts as well as hard/cracked rubber parts. Corrosion of the metal, exposure to fine rust particles (grinding paste) ruin the seats / sealing areas in the petcocks. I reckon only 50%-70% stand a chance of being repaired when they are that old. The diaphragm versions seem to repair better than some of the manual petcocks.

2) Multiple petcock variants. I know with some of the Kawasaki petcocks the design changed slightly during the course of the production run. I have seen plenty of examples of petcocks where parts just will not fit correctly in one version, but fit perfectly in the other. Yet when you look-up the part numbers, only one part number for the petcock exists.

3) Rebuild kit O rings - on some diaphragms, the little O ring that seals works better if it's replaced with a slightly larger O ring. I'm not sure if the O ring is really the wrong size, or the spring behind the diaphragm is too weak - regardless, the result is gas gets by the daiphragm seal.
 
If he is still getting drips of gas out of the vacuum line it has got to be the diaphram or the mating surface of the cover/body. Or like Hoomgar said, maybe applying too much vacuum.
Somebody correct me if I'm wrong, but could you use a tiny bit of sealant on both sides od the edges of the diaphram? Maybe the housing is pitted?
 
I'd be much less worried about a slight drip from it if it is in the ON or RES position. Where I'd be concerned at this point is whether or not it pulls gas through the vacuum line. If you installed everything properly and didn't damage the new diaphragm, it should be ok. Because the vacuum chamber on it is so small, a tiny leak even in your test hose would leak the vacuum very quickly. If the vacuum causes fuel to flow and doesn't allow fuel to come into the vacuum line, you are probably pretty good.

As for stopping the leak, pull it back apart and clean the sealing surfaces really well and inspect to make sure you don't have really deep pitting or abnormalities in the surface. To clarify, where are you seeing the fuel drip coming from? Out the fuel line or around the lever? Did you pull apart the lever and change the o-ring on the shaft?
 
Hopefully I won't have to fool with another petcock. I got my solenoid valves installed. When the ignition is turned on, the solenoid opens for the main tube. I have a switch on my handlebars to turn on the reserve. It's wired through the switch to the ignition voltage and turns on the reserve tube. I used my old petcock and did some sawing and grinding (and some JB Weld) to come up with a two tube (main and reserve) port that bolts into the old petcock location on the tank. It works like a charm!
 
Ok I got it fixed. Thank God! but I like the idea of using solenoids to engage or disengeg the fuel. Can you post some instructions and pics so that we could do that as well . I appreciate everyones help.
 
prism4 said:
Ok I got it fixed. Thank God! but I like the idea of using solenoids to engage or disengeg the fuel. Can you post some instructions and pics so that we could do that as well . I appreciate everyones help.
Click to expand...
I'll see what I can do.
 
'79 GS750L fuel shutoff valve

'79 GS750L fuel shutoff valve

I'm following this discussion thread with interest. My petcock was vandalized, broken clean off. I can't find a replacement, stock or otherwise, locally. Any leads on where I might score one? Thanks for any help you can offer.
 
eBay. They are on there all the time. Many fit multiple models, so check the parts fiche to see which ones you can use.
 
Hopefully I won't have to fool with another petcock. I got my solenoid valves installed. When the ignition is turned on, the solenoid opens for the main tube. I have a switch on my handlebars to turn on the reserve. It's wired through the switch to the ignition voltage and turns on the reserve tube. I used my old petcock and did some sawing and grinding (and some JB Weld) to come up with a two tube (main and reserve) port that bolts into the old petcock location on the tank. It works like a charm!
Click to expand...


Clever, I like it :cool:
 
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