Author Topic: Petcock kit install  (Read 16126 times)

Offline Mettler1

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Re: Petcock kit install
« Reply #45 on: June 01, 2013, 07:21:20 am »
With a vac petcock, just test it a few times a year by taking the fuel line off and see if it leaks.  That would offer some additional peace of mind.

Here is a question - when the fuel lines are full and the petcock off (manual or vac), if one of the fuel valves leak, the fuel in the lines and all the way back up to the petcock could trickle into the float bowl with the leaky valve. 

Is there enough fuel in the lines to pose a threat of hydrock?
   If I have the fuel line disconnected from the petcock I don't know if there would be enough fuel in the line to fill the carb up to over flow into the cyl. assuming a stuck float valve. With my overflow tubes it would not be a problem other than a little gas on the floor. At least I would know I had a stuck float valve.
'94 Concours 112,000 miles-- 7th gear,2MM,KB fork brace,Over flowtubes,Stick coils,Tcro shifter,GPS,Torque cams,SPOOKFAK,block off plates, SS brake & clutch lines,KB risers, FENDA EXTENDA, emulators,etc

Offline Mettler1

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Re: Petcock kit install
« Reply #46 on: June 01, 2013, 07:32:38 am »
  Although there were some good questions on this thread and some good answers we are starting to get into the "what if" . It pretty much "is" what it is and unless something better comes along we'll just have to deal with what we have at this moment. 8)

  I think I'll stay inside today. An asteroid might try to kill me today!!
'94 Concours 112,000 miles-- 7th gear,2MM,KB fork brace,Over flowtubes,Stick coils,Tcro shifter,GPS,Torque cams,SPOOKFAK,block off plates, SS brake & clutch lines,KB risers, FENDA EXTENDA, emulators,etc

Offline Daytona_Mike

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Re: Petcock kit install
« Reply #47 on: June 01, 2013, 10:34:54 am »
What's going to introduce air into the fuel line to equalize the pressure differential and let the fuel flow out of the fuel line?
Ooo Ooo , I know the answer to that one. I sound like Horshack on Welcome Back Kotter.
  I had issues when I was testing  external fuel filters and I would get occasional  vapor locks. Air was getting in to the fuel filter but how? I would fill the filter with solid fuel ,ride and stop there was  air is back in the fuel filter again.
When I bought clear fuel line I could see it. When the float needle shuts of fuel flow only air is sitting below the float valve-- small bubbles of air where squeezing upwards past the seat and making their way up the hose and collecting in the fuel filter.

I can only assume that when the petcock shuts off the remaining  short column  off fuel does not have enough pressure to prevent  air from leaking upwards  past  the float valve.
If you still have fuel in the tank, you are not lost yet
Most motorcycle problems are caused by the nut that connects the handlebars to the saddle

Offline Steve in Sunny Fla

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Re: Petcock kit install
« Reply #48 on: June 01, 2013, 10:50:12 am »
maybe a little Mike, but you never saw your fuel line completely empty into the carbs though, did you?

i think the migration you saw had more to do with the heated fuel in the line exhibiting some pressure from expansion. Once equalized, it would stop, not drain entirely down into the carbs.  Steve

Offline Daytona_Mike

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Re: Petcock kit install
« Reply #49 on: June 01, 2013, 01:08:44 pm »
maybe a little Mike, but you never saw your fuel line completely empty into the carbs though, did you?

i think the migration you saw had more to do with the heated fuel in the line exhibiting some pressure from expansion. Once equalized, it would stop, not drain entirely down into the carbs.  Steve
Your right, the fuel line never went empty. Just  air collection in the fuel filter.
If you still have fuel in the tank, you are not lost yet
Most motorcycle problems are caused by the nut that connects the handlebars to the saddle

Offline Cholla

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Re: Petcock kit install
« Reply #50 on: June 03, 2013, 04:33:47 am »
Steve-I am thinking. Gas fumes collect and a spark causes an explosion. The fumes are explosive. Seen it happen. How about homes with the furnace and water heater in the garage?
THINK!
And if the vac operated petcocks are so reliable why are we even having this discussion?
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