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petcock
Topic Started: Aug 8 2017, 10:15 PM (117 Views)
Retrobop
Member
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Hi gang
Why is there no OFF on my 1991 Zephere fuel tap ? Thanks
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tocat3
100 MPH
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Not sure for definite but have they got a vacuum tap and the theory is engine running creating a vacuum opens the tap letting the fuel through and when the engine stops it shuts the tap off. The only problem with this is when they wear they let fuel through especially if the carb float needles are worn. In worst case carbs flood and dump fuel all over the floor or in the crankcase ( see Kawasaki er5 ) . Never leave the tap in prime and beware of aftermarket tap repair kits as they never seem to contain the correct parts.
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hugojose
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You may say is 'automatic'. It is operated by vacuum, thus when the engine does not run, it is in the 'OFF' position,......unless is leaking.

ON means 'automatic' operated by vacuum, ON/OFF depending if engine is running or not, and is connected to a tall filter in the tank on top of tap, which runs dry at about 20% of tank level.

RESERVE means, it is connected to a short filter on tap which allows all the tank to flow down (It is not really "Reserve", it simply makes the whole tank available. I always have it in this position.

PRIME means, bypasses the vacuum and is on all the time, connected to short filter and whole tank.

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tocat3
100 MPH
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Yes you have got it, not sure if yours is a remote tap or fitted in the bottom of the tank but the principal is the same if it is a vacuum tap. The only problem of leaving it on reserve is if you run out that's it you have to get off and push. But if you use ON then when it hesitates you can switch and do a few miles on reserve. I'm an old worn out foggy and aint got the strength to push a scooter these days :256
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hugojose
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Yes, the Zephyr does not need 'reserve' really as it has a fuel gauge, and also has trip odometer, like any automobile.
Edited by hugojose, Aug 13 2017, 11:13 AM.
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