Author Topic: # 2 vacuum line and hydro-lock  (Read 306 times)

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Offline Lee

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# 2 vacuum line and hydro-lock
« on: July 08, 2019, 08:34:09 am »
Seems I saw once a mention/discussion of a different hydro-lock failure scenario at carb # 2 vacuum line causing hydro-lock from fuel tap leakage past vacuum diaphragm. Can not seem to pick it up with search feature. Wanted to determine if this type failure would bypass float bowl tube mod protection. Anyone have a link or personal experience with this type of failure?

Offline RWulf

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Re: # 2 vacuum line and hydro-lock
« Reply #1 on: July 08, 2019, 02:42:03 pm »
Anything is possible. You would have to have the diaphragm fail and leak gas into the
vacuum line. The tank being higher could let gas flow directly into the intake port.
Float bowl tubes would be of no use in this case. BUT the spring that normally
keeps the valve closed would still keep gas from flowing. So you need 2 failure points
to have a problem.

Offline connie_rider

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Re: # 2 vacuum line and hydro-lock
« Reply #2 on: July 08, 2019, 03:17:37 pm »
As he said, anything is possible.

There is a vent on the side of the petcock that leaks gas when the diaphragm is damaged.
That normally occurs only with engine running...

That vent would also have to be plugged for gas to flow directly into the vacuum line.

So you need 2 3 failure points to have a problem.

Ride safe, Ted
« Last Edit: July 08, 2019, 06:12:46 pm by connie_rider »
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Offline Daytona_Mike

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Re: # 2 vacuum line and hydro-lock
« Reply #3 on: July 08, 2019, 04:23:53 pm »
Good question.  I have never heard of anyone actually hydrolocking from that scenario but anything is possible.
Just means it is more important to replace (I tried a repair- not worth the aggravation and time  compared to the savings) the OEM petcock from Murphs  on a timetable.
I did mine every 4 or 5 years.
Overflow tubes are  still mandatory on C10's/
Normally aspirated engines have perpetual turbo lag
2000 Red C10 1052 kit 100+HP  + way more torque.
2008  C14 Silver Dammit Full AreaP- Flies are put back in SISF_Flash
2011  KLR650   688 piston ported and polished
2011  KTM 530    This thing is FUN!!

Offline m in sc

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Re: # 2 vacuum line and hydro-lock
« Reply #4 on: July 08, 2019, 06:06:16 pm »
SAW IT HAPPEN ON A KZ650 & AN H1 BEFORE. .02

Offline Lee

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Re: # 2 vacuum line and hydro-lock
« Reply #5 on: July 08, 2019, 07:39:35 pm »
Thanks to all for reply. So would seem that an exceptional o-ring and it's regular replacement is the order of the day. Last rebuild I polished o-ring seat with rouge to a mirror shine.

Think I used a K&L rebuild kit on that fuel tap. Might have to rethink that choice. At least the o-ring for sure.

Do have a Murphy's manual tap conversion. Was going to switch come winter. Might have to rethink that one too!

To think as well! I though sex was safe again.............