Not the phantom out of gas syndrome after all! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 29 (permalink) Old 07-16-2008, 10:41 AM Thread Starter
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Not the phantom out of gas syndrome after all!

Just thought I'd share something I found a couple days ago that hopefully might help folks.

I thought that I might be experiencing the phantom out of gas syndrome that I have been reading about recently. I'd be riding along with the tach around 4000-4500 and the bike would start to skip and hesitate, like it was starting to run out of gas. It was most noticeable on acceleration, but would sometimes occur while steady cruising. So I took apart the gas cap to clean it out and blow out the vent line, but it seemed pretty clear already. While poking around a bit I found a hairline crack in the vacuum line from the petcock to the carb. I guess the hose was pretty old and brittle, and it was cracking at the bend in the line just before the nipple on the carb. I only saw it when shining a bright flashlight directly on the hose. I changed out the hose and so far the problem has not returned. I'm guessing that under load the vacuum hose would leak and stop or slow the flow of fuel, enough to make it hesitate. Something else to check I guess when experiencing what appears to be the phantom out of gas syndrome.

Chris
Wayne, NJ
1989 VN750-A5
VROC #27781
-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
-MF Battery
-De-Goated/Re-goated
-Coastered
-Splines Lubed
-Stebel Nautilus Horn
-AutoMeter 2" VOM
-Silverstar Headlight
-Refinished Gauge Rings and Mirrors(Flat Black)
-Refinished Swingarm/Lubed Pivots
-K&S Turn Signals Clear Cover/Amber Bulb
-Kenda Kruz 110/90-19 front 170/80-15 rear
-Clear Alternatives LED tail light
-Plexifairing III
-Willie & Max Saddlebags and SissyBar Bag
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post #2 of 29 (permalink) Old 07-16-2008, 08:37 PM
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Thank you ChrisC that is something to look at. I have had that trouble also, but my bike is only a 2004 not that old. I have pulled the pet cock also no sign of anything. I can check it anyway. It has happed to me about 5 times since I have owned the bike. I have only 5000 miles on the bike.Checked the cap also.

2004 25,500 miles
Led tail light enhancement
Homemade floor boards
Headlight modulator
Extra heat sink on R+R
R+R relocation
Homemade driver's backrest
Fused Stator
Mcct conversion-cost 4.50
Ride-on in tires
crash bar with home made hyway pegs
iridium plugs
home made fork wind deflectors
coil pickups adjusted.
Kenda kruz tires 110/90 170/80
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post #3 of 29 (permalink) Old 07-28-2008, 06:21 AM
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How's this holding up Chris? Has the problem returned?
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post #4 of 29 (permalink) Old 07-28-2008, 11:50 AM Thread Starter
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So far so good on this issue. I've had other issues to work out, but this one seems to be gone!

Chris
Wayne, NJ
1989 VN750-A5
VROC #27781
-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
-MF Battery
-De-Goated/Re-goated
-Coastered
-Splines Lubed
-Stebel Nautilus Horn
-AutoMeter 2" VOM
-Silverstar Headlight
-Refinished Gauge Rings and Mirrors(Flat Black)
-Refinished Swingarm/Lubed Pivots
-K&S Turn Signals Clear Cover/Amber Bulb
-Kenda Kruz 110/90-19 front 170/80-15 rear
-Clear Alternatives LED tail light
-Plexifairing III
-Willie & Max Saddlebags and SissyBar Bag
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post #5 of 29 (permalink) Old 07-28-2008, 01:55 PM
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I inspected that vent tube on my bike, and found a small tear in it just before the connection on the carb, so I fixed that and now am just waiting. I've only has the "phantom gas" issue once and that was several weeks ago, so we'll see.....
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post #6 of 29 (permalink) Old 07-28-2008, 02:14 PM Thread Starter
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Good Luck! I hope that was it!!

Chris
Wayne, NJ
1989 VN750-A5
VROC #27781
-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
-MF Battery
-De-Goated/Re-goated
-Coastered
-Splines Lubed
-Stebel Nautilus Horn
-AutoMeter 2" VOM
-Silverstar Headlight
-Refinished Gauge Rings and Mirrors(Flat Black)
-Refinished Swingarm/Lubed Pivots
-K&S Turn Signals Clear Cover/Amber Bulb
-Kenda Kruz 110/90-19 front 170/80-15 rear
-Clear Alternatives LED tail light
-Plexifairing III
-Willie & Max Saddlebags and SissyBar Bag
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post #7 of 29 (permalink) Old 07-31-2008, 04:51 PM
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Nope! No such luck here, my bike did it again today. My bike seems to do it when I'm VERY low on gas, like hovering near the "E", and when it's really stupid hot and humid out, like today, and last time it happened.

The search continues...
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post #8 of 29 (permalink) Old 07-31-2008, 07:41 PM
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Quote:
Originally Posted by 750Doug View Post
Nope! No such luck here, my bike did it again today. My bike seems to do it when I'm VERY low on gas, like hovering near the "E", and when it's really stupid hot and humid out, like today, and last time it happened.

The search continues...
Did you have the petcock on res. or run?

Glenn

1985 VN700
Saddle Bags
Small Sport Windshield
R/R moved
Home built coasters
Kaw touring front fender
1990 Fuel tank
Kenda Kruz 110/90-19 & 170/80-15 tires
NGK Iridium plugs
NGK plug caps and 7mm copper core wires.
Deer Whistles

My VN700 pic's

VROC #7740
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post #9 of 29 (permalink) Old 07-31-2008, 07:53 PM
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Yes the same things happens to me on the bike. It always seem to be close to empty and sort of a hot day. One of these days some lucky soul will find out what this is all about. It also happened to me after I switched to Res. and in a few minutes it ran out of gas. Not really out of gas, but the problem. It seems to loose vacume sometimes when you switch to reserve, at least with me. Has anybody had this happen to them also, with switching on the pet cock. All hoses are fine.

2004 25,500 miles
Led tail light enhancement
Homemade floor boards
Headlight modulator
Extra heat sink on R+R
R+R relocation
Homemade driver's backrest
Fused Stator
Mcct conversion-cost 4.50
Ride-on in tires
crash bar with home made hyway pegs
iridium plugs
home made fork wind deflectors
coil pickups adjusted.
Kenda kruz tires 110/90 170/80
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post #10 of 29 (permalink) Old 08-01-2008, 04:18 AM
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Quote:
Originally Posted by Glenn M View Post
Did you have the petcock on res. or run?
Run. It's always on run. I don't usually let the tank get that low, usually I refill when the gauge is at the last white dash mark. Yesterday, (and last time it happened) it was too the left of the white mark. I considered maybe my fuel gauge is incorrect, but the fix to get the bike running is to open the filler cap for a minute or so, and then all is well.

After that I ride for several miles in that low fuel state without the problem. Both times it happened within two blocks of leaving, and the bike had sat with that low fuel in the hot, humid weather for 6 hours or more.

I have not run the fuel that low on cooler days to see if that has anything to do with it, but I suppose I could try......

And when I say hot and humid, the weather has been sunny, bike sat directly in it, temps from 85-95, and humidity at 70-80%.

Last edited by 750Doug; 08-01-2008 at 04:21 AM.
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