1996 blazer - what is the valve-looking thing on the top front of the gas tank and where can you get a replacement?
that is called a fuel tank vent valve there are two kind's one you can remove from the tank
this part is sold at most auto parts stores the 2nd one is permanent and can not be remove you will need to buy a new tank try e-bay got one for under $100.00
There should be a tag under one of the bolts on the cover of the rear end. If it is not there you might be able to look on the Build tag somewhere in the Blazer. I think it is on the door or in the glove box. If you can not find it there you can take the VIN number to your local Chevrolet dealer and the parts department can look it up for…