I use these clamps on any hose they fit. However, you better make sure you don't have to cancel them any time soon. You are a tough brace. I use hoses on the power steering, whether it's a return line or a pressure line, and they stay tight. I haven't tried fuel systems, but since they handle high pressure power steering lines I can't imagine you can go wrong with fuel systems either. Thank you SUR & Road for a great product.