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Author Topic: Weird fuel problem (long)  (Read 1554 times)
Baloo
Member
*****
Posts: 181


Rimouski, Canada


« on: June 14, 2010, 08:16:31 AM »

Well, it finally happened. Yesterday, my fat lady (99 IS) let me down on the side of the road  Cry

Here's what happened: Went to see my daughter about 200 miles from home. While there, I wanted to take the occasion and go check a motorcycle gear store because I wanted to buy something I cannot find around home that they had on hand. Anyway, got there with no problem at all, bike ran normally.

When I got in town, I came through a fairly long 30 mph zone again with no problem. Then I got in the town and through the highways ramps. There, just as I was accelerating on a ramp to get on the highway, she started misfiring and died. It did exactly the same as when I have to switch on reserve, which I did, but then, a look at the fuel gauge told me 3/4 of the tank was left, so I could not be out of fuel. The engine died, so I pulled on the shoulder and tried to start her again: no luck.

I called a towing to get to a repair location and while waiting for the towing, I checked the fuses and wiring, altough, I'm pretty sure that the problem is fuel related. The engine had been stopped for maybe 15 minutes and I decided I'd give her another try. Plenty of power left in the battery for cranking and the battery is less than a year old. Then, she started and ran just as if nothing ever happened! I let her idling for a few minutes while I called off the towing with no problem. I got on and went to the store I was heading to. Been inside maybe half an hour, got out, started again, no problem.

I got back on and went to my daughter who wasn't there, so I got back on after maybe 5 minutes. She started fine, but about 3 blocks away, died again. I stopped (no choice) and waited 10 minutes: she started again and ran just normally.

So I decided to get back on the highway and try to run back home. I got back without any other kind of problem. She ran just fine for the 200 miles back to home. I stopped a few times for lunch and for fuel and she started right back as usual.

I have the stock petcock and I rebuilt it about 2 years ago because it was dripping. I thing the problem is probably in there, but I cannot understand why it would have worked again. Logically, it should have never started again...

I checked the vacuum lline to the petcock, everything seems normal. I opened the fuel tank cap and listened for air drawn in the tank (pinched or clugged vacuum line): normal.

I did not have to remove the tank lately, so I should not have caused the problem while working on the bike.

Does anybody have an similar experience or an idea? I'm thinking on rebuilding the petcock or replacing with a Pingel, but the fact that I don't have a confirmation on where the problem came from is a bit frightening. It might be just waiting for the right time to show up again...  Angry
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Never ride any faster than your guardian angel can fly...
DFragn
Guest
« Reply #1 on: June 14, 2010, 08:26:41 AM »

I'll bet a dozen KrispyCremes it's your tank vent line. Next time it happens open the fuel cover and let some air in. If it fires right up it's the vent line. Or carry an extra key and leave it in the fuel cap, when it starts to stutter just open the cap and close. If it smooths out then you can be certain it's the tank vent line that's kinked or plugged.
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1FAST6
Member
*****
Posts: 164


Sanford, NC


« Reply #2 on: June 14, 2010, 08:34:37 AM »

Pull the vac line off #6 and apply suction.  If it leaks it's either the vac hose or petcock.  If not, check the vent.
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MP
Member
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Posts: 5532


1997 Std Valkyrie and 2001 red/blk I/S w/sidecar

North Dakota


« Reply #3 on: June 14, 2010, 08:39:03 AM »

+1 on petcock needing rebuild. Very similar happened to me.

MP
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"Ridin' with Cycho"
98valk
Member
*****
Posts: 13498


South Jersey


« Reply #4 on: June 14, 2010, 11:01:22 AM »


sounds like a bad vacuum diaphragm which is not completely bad yet. My bike was doing the same thing. I searched and a few others have had similar experience.
I rebuilt mine with a snubber in the vacuum line.

http://www.valkyrieforum.com/bbs/index.php/topic,3408.0.html
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C  10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp

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Farther
Member
*****
Posts: 1680


Quimper Peninsula, WA


« Reply #5 on: June 14, 2010, 01:45:24 PM »

Sounds like the vent line from your discription but it could be loss of vacuum from the petcock too.  The easiest is to check/replace the vent line.
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Thanks,
~Farther
larryh0841
Member
*****
Posts: 76


« Reply #6 on: June 14, 2010, 05:50:56 PM »

Mine did exactly the same thing every time the petcock needed repair.  Finally got rid of all the vacumn related components and have had no problems since.  The problem with the vacumn diaphram was more frequent at higher altitudes.
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