help with gas in vacuum pulse line of carb - Snowmobile Forum: Your #1 Snowmobile Forum

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post #1 of 7 (permalink) Old 04-02-2008, 11:29 PM Thread Starter
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help with gas in vacuum pulse line of carb

74 arctic panther 340
walbro carb.
rebuilt carb for friend (5 sled and 4 car rebuilds under my belt)
he said he had fuel going into his vacuum or pulse line. the sled sputtered a couple of times. also had spark trouble but now fixed. didnt try the carb since he fixed the spark. brought the carb back to me to have me look at it. I could not find anything wrong with total breakdown except that the inlet seat lever was about .010 to .020 off. everything else had been professionally cleaned the first time and a new rebuild kit done completely. I am wondering if he mixed up one of the three lines to and from the carb. maybe the return line switched with the pulse vacuum line. any thoughts on this or what else could be the problem. the sled had run beautifully up until parking it a couple of years ago. any suggestions would be greatly appreciated. thank you. jaybird
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post #2 of 7 (permalink) Old 04-03-2008, 06:13 AM
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The only thing that can put fuel into the pulse line is a torn diaphragm.

1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
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post #3 of 7 (permalink) Old 04-03-2008, 08:18 AM
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How does he know there is fuel in that line? There is suposed to be fuel in the case! Is there maybe a bigger engine problem, like compression?
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post #4 of 7 (permalink) Old 04-06-2008, 02:25 PM
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my friends sled was doing the same thing..gas in pulse line...a pump rebiuld solved that, but we had the carbs off and found a broken reed. not sure if your sledhas reeds, but i would check and see if they are cracked or broken.

1980 eltigere 6000 500cc l/c
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post #5 of 7 (permalink) Old 04-06-2008, 02:29 PM
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i just looked it up your sled does not have reeeds

1980 eltigere 6000 500cc l/c
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post #6 of 7 (permalink) Old 01-11-2017, 08:41 AM
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look for pitting on pump surfaces you can lap surface without ridge mikuni oem kits work better

Last edited by asparaguy; 01-11-2017 at 08:52 AM.
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post #7 of 7 (permalink) Old 01-12-2017, 05:57 AM
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Welcome!
And a new pump is only $25!
This is a 9 year old thread!
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