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Old 06-20-2012, 12:52 AM   #1
ANDRASTA
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Testing the Fuel Petcock

Hi guys,

I just want to hear your methods or even get a solid write up(maybe make a sticky) on testing the fuel petcock?? How to test, what to look for? etc.

I'm rebuilding my carbs and everything and would hate to overlook this part of the fuel system.

Much appreciated.
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Old 06-20-2012, 06:13 AM   #2
tas1100g
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Re: Testing the Fuel Petcock

Pretty basic testing. Put the lever on Pri and fuel should flow out. Set the lever on reserve and fuel should not flow out until you suck on the vacuum nipple. Set the lever in the normal on position and again fuel should not flow out until you suck on the vacuum nipple.

I supposed it would depend on which type of pet cock you have too by this is how it works on mine.
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Old 06-21-2012, 01:51 PM   #3
jtolo3
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Re: Testing the Fuel Petcock

the brand new (purchased from suzuki) petcock on my 88 gsxr 750 dribbles fuel even when the vacuum is unplugged. when i pulled the tank to adjust valves i had a big puddle of gas in my garage last week after it sat overnite.

next winter i am going to re-do the fuel lines and add two in-line plastic shutoff valves for lawn tractors to assure flow is off. i bought the two little in-line valves for 10 bucks including shipping--which would have saved me over 150$ if i had just put them in and kept the older petcock. oh well, live and learn.

replacing the o-rings on the floats ultimately solved my fuel leakage problem during riding season, i just want the fuel flow to stop entirely to prevent any accidents during winter storage.
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Old 06-21-2012, 03:26 PM   #4
javadog
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Re: Testing the Fuel Petcock

During winter storage, you should just completely drain the tank and all of the carb float bowls anyway.

JR
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Old 06-22-2012, 09:59 AM   #5
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Re: Testing the Fuel Petcock

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Old 06-23-2012, 01:30 PM   #6
wicked86gsxr
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Re: Testing the Fuel Petcock

For winter storage I add fuel stabilizer and 100% race fuel. The race fuel has no ethanol so you don't get any water in fuel like the ethanol based gas.
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Old 11-16-2012, 02:00 PM   #7
pontaic
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Quote:
Originally Posted by tas1100g View Post
Pretty basic testing. Put the lever on Pri and fuel should flow out. Set the lever on reserve and fuel should not flow out until you suck on the vacuum nipple. Set the lever in the normal on position and again fuel should not flow out until you suck on the vacuum nipple.

I supposed it would depend on which type of pet cock you have too by this is how it works on mine.
Hi so what carb does the vacuum nipple plug on to?


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Old 11-16-2012, 02:29 PM   #8
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Re: Testing the Fuel Petcock

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Originally Posted by pontaic View Post
Hi so what carb does the vacuum nipple plug on to?

It's usually #3, but they are all the same.



cheers
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Old 11-17-2012, 06:09 AM   #9
rodriguez
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Re: Testing the Fuel Petcock

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Originally Posted by Wag View Post
W....T.....F is that?!
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Old 11-17-2012, 09:38 AM   #10
Wag
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Re: Testing the Fuel Petcock

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W....T.....F is that?!
Some jokes should not have to be explained..........

--Wag--
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