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« on: December 17, 2020, 05:31:52 PM » |
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Not a full tank.
Cuts out. I pull over and use my key to open the gas cap. Leave it open and crank the engine.
Fuel gets into the carbs, close the gas cap and away I go without a care in the world.
Why is the fuel starvation happening?
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Chrisj CMA
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« Reply #1 on: December 17, 2020, 06:54:49 PM » |
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Not a full tank.
Cuts out. I pull over and use my key to open the gas cap. Leave it open and crank the engine.
Fuel gets into the carbs, close the gas cap and away I go without a care in the world.
Why is the fuel starvation happening?
Either the tank is not venting properly or the petcock is not keeping up with the fuel flow demand. This same symptoms happened to my bike when the petcock was failing. Next time it happens try not opening the tank and see it the carbs fill anyway. That may indicate it’s not the tank. |
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Bagger John - #3785
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« Reply #2 on: December 18, 2020, 05:27:07 AM » |
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I'd also check the vent tube running from rear of the tank to a point with all the other drain/overflow hoses...see if it's kinked or blocked anywhere along its length.
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indybobm
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« Reply #3 on: December 18, 2020, 05:34:26 AM » |
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Sometimes the vent tube itself gets blocked. The way to check that is to remove the vent hose from the tank, put another hose on it and see if you can blow through it. You should be able to get to the vent tube from the left side of the bike in front of the center cover. You might have to remove the rear bolt of the tank and lift it up a little with a block of wood. If you have the oem petcock, reove the chrome knob first to keep from breaking it.
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So many roads, so little time
VRCC # 5258
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« Reply #4 on: December 18, 2020, 07:43:51 AM » |
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Thanks
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Tundra
Member
Posts: 3882
2014 Valkyrie 1800
Seminole, Florida
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« Reply #5 on: December 18, 2020, 08:03:53 AM » |
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Ditto...What they said. If you had the tank off recently, possibly it's pinched or kinked? I had the same symptoms and it was a petcock rebuild for me.
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If you can't be a good example: be a WARNING!!
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Jersey
Member
Posts: 545
VRCC #37540
Southern Maryland
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« Reply #6 on: December 18, 2020, 08:09:14 AM » |
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Make sure the vent hose has an open "T" fitting part way down! Don't ask me how I know, but if you don't have that or if it's clogged it'll starve the carbs.
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Jersey
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gordonv
Member
Posts: 5763
VRCC # 31419
Richmond BC
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« Reply #7 on: December 18, 2020, 06:53:24 PM » |
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You mentioned you open the fuel cap, but did you hear the noise of air rushing in when you did it?
If so, you've a vacuum, and the vent tube is pinched or plugged.
After opening, does it happen again, or no more issue?
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1999 Black with custom paint IS   |
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« Reply #8 on: December 20, 2020, 06:21:49 AM » |
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You mentioned you open the fuel cap, but did you hear the noise of air rushing in when you did it?
If so, you've a vacuum, and the vent tube is pinched or plugged.
After opening, does it happen again, or no more issue?
No whoosh and no it doesn't happen again. |
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Tfrank59
Member
Posts: 1364
'98 Tourer
Western Washington
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« Reply #9 on: December 20, 2020, 10:03:06 AM » |
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If all else fails try draining the bowls on the carbs. Last summer I had a similar deal, thought it was the petcock or tank vent, so I rebuilt the petcock and went through the vent hoses. Then took her out and fuel still wasn't getting into the carbs. This was only time the girl left me stuck roadside. that was the issue --maybe some crap stuck in the carbs or what, though it didn't hurt to rebuild my petcock (22 years old).
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-Tom
Keep the rubber side down. USMC '78-'84
'98 Valkyrie, ‘02 VTX 1800, '96 Royal Star, '06 Drifter, '09 Bonneville, '10 KTM 530, '04 XR 650, '76 Bultaco, '81 CR 450, '78 GS 750...
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Bret SD
Member
Posts: 4306
***
San Diego, Ca.
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« Reply #10 on: December 20, 2020, 04:33:58 PM » |
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Britman,
After I did the carbs on my 02 Standard it was running great, I rode it to my girl's house and stayed that night. When I took off the following morning it was running perfectly until it quit about a mile from her house.
I didn't have glasses with me but had a flashlight and a few tools in the bags, so I walked to a Goodwill store about a mile away and got some specs so I could see. Immediately I looked at the fuel supply hose and could see it had kinked overnight. It was a bit too long when I replaced it and overnight the hose succumbed to the pressure of being squeezed lengthwise into a position it was too long to maintain. I lifted the kink out and wedged something under the hose until I could get it home and shorten it.
Is it possible heat from sitting in the sun 'relaxes' the supply hose enough to develop a slight kink that wouldn't be there if the hose were cooler? Maybe it's just enough restriction the fuel supply can't keep up with demand.. possibly there's a slight tank vacuum created from the vent not working properly as well, and releasing the vacuum also increases fuel flow?
Dunno, just spitballing from 2000 miles away
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Bret
02 Standard -- Blue & White
82 Aspencade -- Red
“No man has the right to be an amateur in the matter of physical training. It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable.” Socrates
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Led
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« Reply #11 on: December 21, 2020, 08:51:12 AM » |
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Everyone is looking at fuel......
These "intermittent" things, could be electrical also. Say a very weak coil gets to a certain temp......it may just cut out.
YES!!! Trying to track down a problem like that, can be worse than if it just doesn't plain work to begin with!!
But as you described the problem, you are safe in guessing that your fuel tank is no longer venting?
But I also have installed a Pingle petcock. Either it is on, or off. No vacuum operation anymore. Just one more weak link eliminated, in the fuel delivery process.
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« Last Edit: December 21, 2020, 09:05:33 AM by Led »
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