I have those clamps from the main gas line to the filter in the engine compartment. Maybe Carlos is right, I also am unsure about the spring clamp tension on those lines that is why I was asking how to determine how much pressure or which size to use. UPDATE: I had a leak once when I was running the engine and I happened to have the engine lid up and caught the leak... since then I never know if they are tight enough and I am worried that I might overtighten them so that is why I was thinking of getting the spring type.