Reply To: 04 GV250 fuel pump
GTRIf it has been 20 years. the rubber and mechanisms inside the Mikuni vacuum pump would be bad due to old age, just nature of rubbers.
I would replace the vacuum pump.
Since it is a GV – No fuel should come out of the “TANK” when tap is set to “OFF” mode. If it did, the pump will slowly drip fuel to the carbs , then eventually as you suspect, the floats will get jammed , then bike won’t start due to fuel inside cylinders (hydrolocking) , also, it might damage the crank and snap a rod or bearing failure.
I’ve seen intake rubbers go bad and they are extremely difficult to acquire nowdays.
This is assuming your bike has a “vacuum” pump – Not the “ProtoType Electric” one Hyosung was using on 1999-2004 era GV’s (They are rubbish) , Mikuni Vacuum pump would be better and it doesn’t need electrics.
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