Port
XS650 Addict
I have been chasing an issue where my carbs are leaking out of the pilot air jet on the rear of the carbs. The carbs are clean, recently rebuilt. When i fist hook them up to fuel, they fill to the right height. if i leave them for an hour or so with the petcock open and the tank about 2ft higher than the carbs one of the carbs will leek out of the pilot air jet and if i check the fuel height then, it will be about 10mm higher. yesterday it was the right carb, i checked and cleaned off the float valve seat. checked it again today and now the left carb is doing it.
i lost the spring to my vacuum petcock so it is always open, i am replacing it with non-vacuum one whenever it gets here. To drain the carbs i have to tilt the tank back and prop it up so that i can unhook the fuel line form the petcock. when i do that, gas shoots out the petcock once the hose pops off as it seems to be pressurized.
Is the tank supposed to have positive pressure? I know that tanks have vents but i was under the impression they were to allow air into the tank as fuel drained.
Is this positive pressure causing my overflowing carbs?
Will the manual petcock solve this issue or do i have a venting/valve issue that i need to solve?
i lost the spring to my vacuum petcock so it is always open, i am replacing it with non-vacuum one whenever it gets here. To drain the carbs i have to tilt the tank back and prop it up so that i can unhook the fuel line form the petcock. when i do that, gas shoots out the petcock once the hose pops off as it seems to be pressurized.
Is the tank supposed to have positive pressure? I know that tanks have vents but i was under the impression they were to allow air into the tank as fuel drained.
Is this positive pressure causing my overflowing carbs?
Will the manual petcock solve this issue or do i have a venting/valve issue that i need to solve?