air in the fuel lines?!?! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 04-05-2007, 05:23 PM Thread Starter
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air in the fuel lines?!?!

The first time i pulled my engine, got it back together and rode it, about 1-2 miles out, (city driving so about 5-7 mins) the bike lost power, then stalled out... it was a peta to get started... it ended up needing a lil choke, although already warmed up to get her going again... I figured it was a mix of my old battery and some stale gas. tank was almost empty, so i filled her up and gave her a 1/4 bottle of sea foam. Never saw it again..

Pulled the engine again, got her back together and rode off this morning. Same thing. Loss of power, followed by a stall out. same thing, needed a lil choke, and a several blips of the starter to get her going....but i now have a 350 cca battery, so i ruled that out. Also this time as i was starting i noticed that she was trying to (the famed err err err catunka catunka err err sound). Rode the rest of the way to class, and did the same just as i got there (another 5 miles).... no issue on the way back.

Switching to reserve seemed to do nothing, good plugs, battery is good, no vent hoses kinks or plugs, and carb vacume hose at 45 deg.

Leaves me to believe this was just an occurance of air bubbles in the lines? anyone else with this issue?

'04 Vn750
Currently Installed
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post #2 of 12 (permalink) Old 04-05-2007, 11:16 PM
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The float bowls should eliminat the posibility of air in the lines.
The air would bubble out in the carbs and not affect the running problem.

Chad Falstad "Hawk"
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post #3 of 12 (permalink) Old 04-06-2007, 11:21 AM
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Weird. Almost sounds like a loose coil connection somewhere causing weak spark or cutting out alltogether. Ironic that you had pulled the engine both times.

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post #4 of 12 (permalink) Old 04-06-2007, 05:15 PM
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Hmm, you don't have a Gremlin Bell, do ya?
While the engine is out of the bike, it's the perfect opportunity for the Gremlins to enter small passages. LOL

It does seem weird though. My bike had done something similar several times, but I've never had the engine out?


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post #5 of 12 (permalink) Old 04-06-2007, 05:29 PM Thread Starter
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Quote:
Originally Posted by fergy View Post
Weird. Almost sounds like a loose coil connection somewhere causing weak spark or cutting out alltogether. Ironic that you had pulled the engine both times.
I thought about that... but its only happened after the engine pull.... nothing after that... Maybe hyper is right

Quote:
Originally Posted by hyperbuzzin View Post
Hmm, you don't have a Gremlin Bell, do ya?
While the engine is out of the bike, it's the perfect opportunity for the Gremlins to enter small passages.
I do have a bell, but being in a moving box somewhere doubles the effect doesnt it?

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Originally Posted by Ccspinner View Post
The float bowls should eliminat the posibility of air in the lines.
The air would bubble out in the carbs and not affect the running problem.
Well if the lines were completly empty, is there enough volume to empty the float bowls? even if still, i think it should have died even sooner...

I plan to run a full tank this weekend with seafoam again. Better safe then sorry i guess... Damn gremlins


Hyper- love your quote at the end, i am gonna have to keep that in mind when someone starts bragging about hardleys again

'04 Vn750
Currently Installed
nat'l cycle deflector shield
westco 12v30 MF, 30A/h w/ 350 CCA's w/ custom box
TOC stator cover w/ Frankenstator mod!
R/R relo

Soon to have (own or on order)
TOC ACCT's
Mez's 110-FRT 170/80-Rear
Custom rear fender and tail light
Givi hard bags w/ custom rear turn signals


Band Engineer/Webmaster for Josey Contreras Tejano Band

Last edited by Hizzo3; 04-06-2007 at 05:35 PM.
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post #6 of 12 (permalink) Old 04-07-2007, 03:45 PM
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This is a mystery that has haunted this bike since day one it seems. Your going along fine, and then the bike stumbles and sounds like it is running out of gas. Most report being able to restart the bike after a short time and then no problems the rest of the way home. Seems to happen even when the bike has a failrly full tank.
Many have attributed it to gas cap venting, crap in the tank, and a host of other stuff including electircal issues..(the too many keys on the key ring theory)
I tend to belive it is a carb problem as generous use of Sea-foam seems to have the highest incidence of what might be a cure.
My defence against this happening was to make sure the tank was always topped off when I had the chamce, the sea foam, and cleaning out the float bowls every year. Gremlin bells and garlic seem to help too....

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post #7 of 12 (permalink) Old 04-07-2007, 08:07 PM
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Quote:
Originally Posted by Hizzo3 View Post
Hyper- love your quote at the end, i am gonna have to keep that in mind when someone starts bragging about hardleys again
LOL, when I first started reading it, I thought ... I don't want a Hardley quote on here, then I read the second part and said to myself, I gotta have that one on here !!


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post #8 of 12 (permalink) Old 04-07-2007, 11:20 PM
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If this was a car, I'd say you were suffering from vapor lock. But seeing as the bike is only warm, not yet really hot, and that the carbs are pretty well insulated from the engine, I can't offer any other explanations. The coil theory sounds like a possibility.

Jim W
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post #9 of 12 (permalink) Old 05-13-2007, 01:08 PM
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I thought it was me!

I am still having an issue with all of that. But my main problem is when I get down just below a half a tank (85-100 miles on the tank) it seems to be running out of gas. I tried to switch over to the reserve and nothing. Pull over and wait a minute, and it will start up again. I had pulled the tank and the valve and saw no blockage or holes in the pick-up tubes. I is also a PITA to start with or without choke. Any advise?

04 VN750 CA Spec, 18700 miles.
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post #10 of 12 (permalink) Old 05-13-2007, 01:36 PM
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Quote:
Originally Posted by vulcan750biker View Post
I am still having an issue with all of that. But my main problem is when I get down just below a half a tank (85-100 miles on the tank) it seems to be running out of gas. I tried to switch over to the reserve and nothing. Pull over and wait a minute, and it will start up again. I had pulled the tank and the valve and saw no blockage or holes in the pick-up tubes. I is also a PITA to start with or without choke. Any advise?

04 VN750 CA Spec, 18700 miles.
Well, many believe it is a gas cap vent problem...Do you have and extra bike key? If so , next time you go for a ride stick it in the gas cap. When the bike begins to do the "running out of gas" dance, quickly reach down with your left hand and open the gas cap. If it is indeed a clogged cap vent, the bike should start running fine right after you open the cap.

As for starting the bike...do you have a MF battery? Is your bike stock or has it been modified in any way?

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