Thanks, Ronald.

I'll take out the foil and install a new one
again with the shiny side out. I had done it
at first with the shiny side in.

The mechanic who helped me to wrap it earlier, had
wrapped additional black electrical insulation tape
over the foil, covering the entire rubber fuel line
to keep it in place. I'm wondering if this should
taken out, since the tape might well keep the heat
in rather than out.