How much room do you have between your fuel tank and your exhaust pipes? That is usually a pretty tight fit also. If you tuck it up close to the floor the heat shouldn't bother it much. You can always put some heat wrap on the line or a small alum heat shield if there is a specific area that is too close. Gas cannot burn inside the line, so other than hot fuel and vapor lock issues the exhaust isn't that much to worry about.
Under no circumstance would I put it under the connector. That would make your fuel line the scrub point for the car. To much potential for damage. And if you ever bottomed it out you run the risk of fuel leakage and sparks at the same time.
