That leads to the fuel pressure vsv. If you smell the fuel back by the tank, could be a leak in the back rubber section of the return line (the middle of the line is steel), or it could be a leak due to rusting in the steel high pressure line where it comes out of the tank (the fuel pump bracket).osts: 49. when the fuel pump outlet line rusted out on my truck I smelled gas for a while but couldn't find any leaks. Then one night I got home and could see gas dripping down the gas tank skid plate. I reached up to the fuel line and it pretty much fell of in my hand.