That solenoid is your Fuel Pressure Regulator. That fat nipple is the fuel return line. It goes to the appropriate nipple on the underside of the tank.
Don't start your bike till you get that hose installed!
I'd hook the hose up to the tank, and blow through it to make sure there's no blockage.
You should be able to blow air through the vent hose, and the overflow hose that also come out of the bottom of the fuel tank.
My bike is a 2002. This "solenoid"? is missing a vacuum line. I've just got the bike and I'm restoring it. I found this missing a hose. Thanks for any info
As stated earlier, that's the fuel pressure regulator, not a solenoid.
The piece missing the hose is the fuel return portion of the regulator that returns fuel back to the tank.
Find that hose and fit it back onto the fitting of the FPR.
Because the FPR will be dumping raw fuel onto your engine instead of back to the tank. Not Good!!