Gasoline Hose
 GOODYEAR 532012124-017-69 GASOLINE HOSE NEW!!! US $75.00 
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I have a 1979 yamaha 750 special.. 3 carbs. I am getting gas gushing out of the pressure relief hose.?
I bought this bike used, The original airbox is missing it has Kand N filters installed where the old air box was. so the hose just runs above the carbs. When I drove it home it was fine. I sprayed carb cleaner in the carbs and put in new spark plugs. I then went away for a week on my honeymoon and when I came home and fired it up that is when I had the problem. I took the carbs off to see if a float was stuck but all three seem to move smoothly. I put the carbs back on and it still spews gasoline out of the relief hose.
They didn't have a pressure relief (it would be an xs750 I believe - I have a xs650sf)
There is an overflow tube from the carbs that allows excess gas to drain which is usually caused by the floats and needle valve not seating. Just because they are not full of fuel or stuck doesn't mean they are seating well enough to shut off the fuel from the tank. Are you shutting off the petcock or relying on the carbs to shut fuel off?
That should have vacuum petcocks, which malfunction and depending on the specific one may be rebuildable.
Yamaha used a bellows design in the shutoff that was prone to tears and leaking- they recalled them and replaced it with a design using an aluminum post and o-ring- these are rebuildable, but only work 50% of the time anyway.
Often faulty petcocks allow fuel to overload the carbs and flood the engine and/or out the overflow.
Mike's xs has rebuild kits for those (all the parts you could want) and custom made non vacuum shutoffs (buy them, it's the better way to go- I spent enough time and $$ rebuilding the vacuum ones before I went that way)
with that in mind, there would be 2 vacuum lines from the carbs to the shutoff- if the shutoff diaphragm tore they could be flowing fuel too.
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