[Alan Roehrich]

No set answer Jack, way too many variables. Quality of the hose, and type of fuel being two of the biggest. But also how long the hose was stored, and in what conditions being another big one. As well as how often the car is run, and what conditions it is stored in. Several big name suppliers have had quality issues over the last few years. I suppose the best thing to do is look at similar rubber items in your fuel system, and watch for sings of trouble, such as weeping hoses, difficulty in tightening hose connections to stop leaks, and the presence of black rubber dust in the fuel system.