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Author Topic: Gas starvation  (Read 1781 times)
shadowmagic
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« on: May 21, 2022, 11:05:21 PM »

So she died on the way home from work today. No gas at all getting through. As some of you may recall, I went through the entire system and replaced and tweaked everything. Vacuum hoses, fuel lines, gaskets, cleaned and synced the carbs, rejet, I mean everything. I wasnt expecting this to happen again. Petcock was replaced around 8 months ago or so maybe a year. I recently had my tank painted though and reinstalled the petcock and everything was fine until today. I've been really thinking about it to try and narrow it down. Which brings me to my question and the only thing I can figure. There is about a reserve tanks left of fuel. When it started stalling it was just like its time to switch to reserve which I did but then it just died completely. Is it a thing that maybe the part inside the tank can get stuck and keep the reserves from flowing into the system? If not maybe its the petcock? Appreciate any and all help  cooldude
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da prez
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. Rhinelander Wi. Island Lake Il.


« Reply #1 on: May 22, 2022, 04:35:05 AM »

Shut fuel off. Disconnect fuel line. Turn petcock to reserve and apply vacuum or petcock.  Fuel should flow. If there is no flow , turn to on and check again
 If petcock is not working,  remove and also remove stand pipe or in tank filter. Recheck everything. Do not second guess.

               da prez
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Jims99
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Ormond Beach Fl.


« Reply #2 on: May 22, 2022, 05:25:44 AM »

Is it possible the shutoff is 180% out and you went from reserve to on? Maybe just the reserve pipe is clogged. If you put more gas in, will it run again.
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Chrisj CMA
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Crestview (Panhandle) Florida


« Reply #3 on: May 22, 2022, 05:45:05 AM »

If it were me. I’d remove the tank. Check for any debris make sure the vent is totally clear and then replace with a Pingel racing fuel valve. Plug #6 intake and never look back
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shadowmagic
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« Reply #4 on: May 22, 2022, 08:30:27 AM »

Thanks everyone for the tips, I'lll start checking the petcock this morning some time. I'll look into the pengal thing and see whats involved with that also. Thanks again everyone!  cooldude
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Challenger
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« Reply #5 on: May 22, 2022, 10:04:10 AM »

Pinched the vent line while reinstalling tank ?
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shadowmagic
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« Reply #6 on: May 22, 2022, 10:45:09 AM »

ok, tank is off and there is no gas coming out of the petcock in either on or res now. Think I'm going to order a new one. Thank you everyone for all the tips. I'll take pics of everything when I get the dragon stacks put on and its running again. Also, if anyone needs the link to the cones I ordered I can provide that also. Looks like they will work, I'll post when they are actually on and "functioning" lol
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Valker
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Texas Panhandle


« Reply #7 on: May 22, 2022, 11:04:07 AM »

ok, tank is off and there is no gas coming out of the petcock in either on or res now. Think I'm going to order a new one. Thank you everyone for all the tips. I'll take pics of everything when I get the dragon stacks put on and its running again. Also, if anyone needs the link to the cones I ordered I can provide that also. Looks like they will work, I'll post when they are actually on and "functioning" lol

If it's the stock petcock, there has to be a vacuum pulled on the line for gas to flow.
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Chrisj CMA
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Crestview (Panhandle) Florida


« Reply #8 on: May 22, 2022, 11:14:26 AM »

ok, tank is off and there is no gas coming out of the petcock in either on or res now. Think I'm going to order a new one. Thank you everyone for all the tips. I'll take pics of everything when I get the dragon stacks put on and its running again. Also, if anyone needs the link to the cones I ordered I can provide that also. Looks like they will work, I'll post when they are actually on and "functioning" lol
The OEM (stock) petcock is not supposed flow gas when disconnect from the bike. If you turn it to “ON” or “RES” and it flows gas it’s broken.
« Last Edit: May 22, 2022, 11:16:39 AM by Chrisj CMA » Logged
shadowmagic
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« Reply #9 on: May 22, 2022, 11:33:51 AM »

Ok, I didnt know that so I'll go try it now and apply vacuum this time. Thank you for the info, I appreciate that.
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shadowmagic
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« Reply #10 on: May 22, 2022, 11:55:09 AM »

Ok, tried it with the vacuum line but still no flow for some reason. I was watching a motorcycle mechanic on youtube and he says failures in this petcock are pretty common. I'm thinking I'll keep one in my saddlebag lol
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Valker
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Texas Panhandle


« Reply #11 on: May 22, 2022, 12:00:09 PM »

Many of us have replaced the stock one with a non-vacuum Pingel. It does make it less convenient to turn on and off. There are a few drawbacks, but the Pingel ALWAYS works.
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Chrisj CMA
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Crestview (Panhandle) Florida


« Reply #12 on: May 22, 2022, 12:04:34 PM »

Ok, tried it with the vacuum line but still no flow for some reason. I was watching a motorcycle mechanic on youtube and he says failures in this petcock are pretty common. I'm thinking I'll keep one in my saddlebag lol

Which line did you draw vacuum on?  And are you sure it was on the reserve position?
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shadowmagic
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« Reply #13 on: May 22, 2022, 12:10:15 PM »

Yes, I made sure and to use the proper connection for the vacuum and I also double checked to make sure it was on reserve. I'll look into the pingel, thank you
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SunshineNomad
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Ft. Lauderdale


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« Reply #14 on: May 22, 2022, 01:35:15 PM »

A cheaper route is a petcock from a 95-98 CBR600 F3 (K&L 18-4133) is non vacuum and works also. I just put one on my I/S.
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Pappy!
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Central Florida - Eustis


« Reply #15 on: May 22, 2022, 01:51:08 PM »

Just a thought here.
Are you sure that your fuel valve is indexed correctly with the selector switch? Main straight down, Reserve straight up and off in the middle?
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gordonv
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Richmond BC


« Reply #16 on: May 22, 2022, 05:21:19 PM »

It shouldn't matter if the petcock is clocked right or not at this time. All that should be tested is that if there is enough fuel in the tank, and a light vacuum is pulled from the back of the petcock (a hose with your mouth), in 2 of the petcock's positions, fuel should flow from the outlet of the petcock, and one not work.

You need to "feel" those indents that the ball valve drops into when you change the setting on the petcock.

You know there is a mod you can do to your petcock to disable the vacuum shut off, and make it into a manual only petcock? Something to know for on the road trips, in case you are far from home and have a fuel delivery failure. I would do this first before buying another petcock/pingle.
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Willow
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« Reply #17 on: May 22, 2022, 07:21:23 PM »

... I was watching a motorcycle mechanic on youtube and he says failures in this petcock are pretty common. ...

That's BS.  There are many thousands running the OEM Valkyrie petcock.  Petcock failures are very rare but they do get a lot of attention.

I did in my hundreds of thousands of Valkyrie miles have one petcock failure.  Interestingly it was the lowest mileage Valkyrie.  A cover set replacement took care of the issue.
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acejr71
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Kerrville, Texas


« Reply #18 on: May 22, 2022, 07:52:49 PM »

If it were me. I’d remove the tank. Check for any debris make sure the vent is totally clear and then replace with a Pingel racing fuel valve. Plug #6 intake and never look back

I had the same issues. Did the exact thing mentioned here and have never another a problem since.
Can not go wrong with the pingel. 
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Chrisj CMA
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Crestview (Panhandle) Florida


« Reply #19 on: May 22, 2022, 08:40:05 PM »

If it were me. I’d remove the tank. Check for any debris make sure the vent is totally clear and then replace with a Pingel racing fuel valve. Plug #6 intake and never look back

I had the same issues. Did the exact thing mentioned here and have never another a problem since.
Can not go wrong with the pingel. 

Yes, I think a Pingel fuel valve is a serious upgrade. I’m down to working on three Valkyries locally but I know of eight. Out of the eight five needed petcock repair or replacement. That’s over 60%. To me that’s enough to not trust the OEM valve much.
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Bagger John - #3785
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« Reply #20 on: May 23, 2022, 06:10:31 AM »

A cheaper route is a petcock from a 95-98 CBR600 F3 (K&L 18-4133) is non vacuum and works also. I just put one on my I/S.
I found two new OEM (Honda) petcocks from that bike. One is on my I/S. The other will go on my Tourer next time I have the tank off.

You have to change or cut down the primary stand pipe (I got the one out of the Valkyrie's old petcock) but otherwise it's a seamless swap.

Probably going to install Dan-Marcs as added insurance but I'm not one to forget the petcock knob. This after 50+ years of manual units.
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Bagger John - #3785
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« Reply #21 on: May 23, 2022, 06:12:19 AM »

... I was watching a motorcycle mechanic on youtube and he says failures in this petcock are pretty common. ...

That's BS.  There are many thousands running the OEM Valkyrie petcock.  Petcock failures are very rare but they do get a lot of attention.

I did in my hundreds of thousands of Valkyrie miles have one petcock failure.  Interestingly it was the lowest mileage Valkyrie.  A cover set replacement took care of the issue.

I had two within a couple years on my '99 Tourer and one on my first I/S. Apart from that I've racked up a gazillion miles on these bikes without issue in that department.
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