I need to replace the plastic(rubber?) fuel line from the fuel pump to the carb on my 87 OMC Cobra 3.0L. The old line is yellow, running around the front of the engine and over the front of the valve cover and seems to be a hard plastic, but I'm thinking that it used to be more flexible. Can I use flexible rubber tubing, or is this some type of plastic tube? I hate to put the wrong line in here and have it melt. Thanks for the help everbody!