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CB750 Barn find project - First Timer
K2-K6:
Yes.
They sometimes get a crack in the tube that allows the fuel out through the overflow pipe without the level of fuel being above the top of that brass tube.
It would do as you indicate by leaking out even if the fuel tap is turned off.
Bryanj:
If it is leaking with the tap turned off either the tap sealing disc is duff or you did not fit the proper washers under the heads of the retaing bolts
yozzer74:
I had this problem mine was the over flow tube had a crack in it couldn't see it but it leaked .I fitted a piece of rubber tube over it think it was 4mm had no trouble after.
Underdog1:
--- Quote from: Bryanj on September 03, 2018, 12:46:00 AM ---If it is leaking with the tap turned off either the tap sealing disc is duff or you did not fit the proper washers under the heads of the retaing bolts
--- End quote ---
I just usescooper washers - didn’t look like anything special when I replaced them
Bryanj:
There is your problem as they should be thick fibre washers that you can not get genericaly. I have used 6mm "Dowty" style washers with some success. If a total seal does not happen fuel leaks down past the bolt threads and bypasses the tap flooding the float bowls
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