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Old July 4th, 2018, 11:51 AM   #5
Triple Jim
Guy Who Enjoys Riding
 
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Name: Jim
Location: North Carolina
Join Date: Jul 2016

Motorcycle(s): Ninja 250

Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
Yes, those are next steps, but you don't have to measure the leak rate, just suck on the vacuum line to the petcock, block it with your tongue, and see if it holds the vacuum.

You can just feel the vacuum on the hose with the engine running, and the hose connected to the carb to check to see if it's present as well. The petcock doesn't take much vacuum to open.

Also, if there's an inline fuel filter, check to see if that's clear. Same with the tank screens (on petcock input tubes, inside tank).

Another possible source of the trouble is a clogged gas cap vent. That's a known problem that can do what's happening to you. That one usually lets you get a few miles down the road before there's enough vacuum in the tank to stop flow.
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