SOHC.co.uk Forums > CB350/400

Fuel flow from petrol tank

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watty51:
Is there a specified flow rate for fuel leaving the fuel tank.

Basically I have held a old float bowl under a fuel hose coming from the petrol tank petcock and it took over 2 minutes to fill to the correct level.

More of a dribble on both the on position and reserve, and with the cap open and shut, makes no difference

Seems a bit slow to me but as I have no reference to go by I was hoping someone could help.

Many thanks the bike is a Cb350f

Orcade-Ian:
Sounds much too slow, I don’t have an exact figure. There is a circular brass filter screen inside the tap, sounds like that might need a good clean.  You need to undo the bottom bowl of the tap to remove it.  Easier with the tank off the bike and on its side on a cushion. There is an o ring above the bowl.  Might be worth removing and cleaning the tap.  It’s held on with two screws one outside and t’other one above the screen.  Another shaped o ring between tap and tank.
Ian

mike the bike:
Recheck the flow with the filler cap open to eliminate a blockage in the fillercapvent.  It's most likely to be the fuel filter, blocked up with rust.

Nurse Julie:
As above. The screens can get totally smothered with crap from the tank. Having drained my CB400/4 tank in the past via the petcock I  would say a float bowl should fill within about 2-3 seconds.

watty51:
Blimey 2 to 3 seconds I’ll def give the whole petcock a good clean out.
I’ve tried checking with the fuel tank cap open and closed, made no difference at all to the flow rate.

Is there a quick way of getting the fuel out of the tank rather than using the petcock. At the rate it’s flowing I’ll be waiting a week

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