2003 VTX Cut out - Can't Fathom a Reason - VTXOA
 
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post #1 of 4 (permalink) Old Yesterday, 10:35 PM Thread Starter
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2003 VTX Cut out - Can't Fathom a Reason

Hi All,


A couple weeks ago, I was riding to work and the bike shut off. Was dripping gas out of the carb. Would run, but only 1/4 throttle or above.



I tore it apart, and replaced the needle/seat with an All Balls racing one. New gasket, etc. I decided, given mine is a 2003, this would be a good opportunity to ditch the fuel pump. So I bought a new 3/" fuel line, took one of the thin heat shields off the other lines and ran it from the petcock, across the top of the motor to the carb inlet. Used about 18" of fuel line. I'm a little worried about the fuel flow when I get down to reserve level, but we'll see.





Well I took it for a ride, it was fine for about 10 minutes, then it started cutting out and actually died. I was doing about 70mph, when I pulled the clutch in, it died, I let it out, and obviusly it would bump start again. I pulled over, and all I could find was the vent hose from the right side of the tank was unplugged. I plugged it back in and decided I'd try and limp it home (about 10 miles). It ran fine. So I then went for broke, got back on the highway for 10/15 miles and kept the rpms up (trying to burn fuel in case the bowl was going dry). Never hiccuped.



There is about a mile long steep grade and I went Wide Open in 5th from before the hill through the top, she runs out of steam at about 105/110, but she didn't buck, sputter, or cut out in the least. It was a solid mile WOT, and if there was a restriction



Could the unplugged vent from the back right of the tank caused some sort of positive pressure or something in the tank causing fuel to not flow with gravity? I can't explain why it did what it did, looking for some insight.
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post #2 of 4 (permalink) Old Today, 09:15 AM
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Vent plugged or unplugged should not cause any issue unless a bug went into it.
Verify the vent is functional.

18" hose over the engine.?!??

It is 10" from the fuel petcock to the back of the air box.
From petcock due east aka right then dropping to carb inlet.

It would seem that you took the long route.
Try the more direct route.

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 193,118 VTX miles
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post #3 of 4 (permalink) Old Today, 09:21 AM Thread Starter
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Originally Posted by Hans&Feet View Post
Vent plugged or unplugged should not cause any issue unless a bug went into it.
Verify the vent is functional.

18" hose over the engine.?!??

It is 10" from the fuel petcock to the back of the air box.
From petcock due east aka right then dropping to carb inlet.

It would seem that you took the long route.
Try the more direct route.

Thanks for the help. I'll remeasure just to be sure. Is this how the fuel line was routed from the factory on 2004+ bikes?

How can I verify the vent is functional?
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post #4 of 4 (permalink) Old Today, 09:39 AM
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More than likely it is functional or you would not have ridden that long after..

Put a piece of hose on the vent tube and then:: blown into it or suck fumes from it.

Look at the 2004 parts fiche for the fuel hose. The fuel port faces to the back so a 90 degree turn there.
Since 2003 fuel port faces engine it should go across and downward to the carb.

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 193,118 VTX miles
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