That’s likely the return line, and if it’s badly flattened, it can affect fuel flow and cause symptoms like a rough idle since the fuel pressure might not be regulated properly. In some cases, you can replace or repair the damaged section of the fuel line assembly without dropping the tank, especially if the damage is in an accessible spot, but it depends on where it’s crushed. If the hard line goes all the way up to the tank, you might need to trace it carefully to find a joint or connection where you can work on it. If possible, compare it with a service manual or parts diagram to confirm it’s #2 before replacing anything.
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