Author Topic: Vacuum in Tank - update  (Read 649 times)

Stig / Major Tom

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Vacuum in Tank - update
« on: February 21, 2014, 02:27:29 PM »
Reported previously that a vacuum is forming in my fuel tank.
1) scoot runs fine with gas cap removed.
2) vacuum forms after scooter is parked for a time - always
3) vaccum noted sometimes during a stop to refuel on cold days
For whatever reason the tank seems to expell air at times - but, having a one-way valve, it cannot then inhale air, so a vacuum forms.
Does not cause any operating issues.....scoot runs fine.
Weird.
If it gets to be an operating issue then I will disconnect the tank's vent hose to the canister - plug that canister opening and let the hose hang from the tank.
Since the engine runs fine with the gas cap off - removing the vent hose and letting the tank breath should have no effect on anything other than the emissions.
Still chuckling about the Van Damme Volvo spoof using 2 scooters.
Stig
Boston Strong
Rural Ohio

And, I'm feeling a little peculiar.

CROSSBOLT

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Re: Vacuum in Tank - update
« Reply #1 on: February 24, 2014, 08:17:12 PM »
I will bet the Like has one of those little vacuum valves like the Yager that drove me NUTS with engine "fading" unexpectedly. Removed and replumbed fixed the "fading".

Karl
Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

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