Erich,
Fuel tanks are known to rust out on the top, from years' accumulation
of dirt and salt holding moisture there. Sniff around, and look for any
tell-tale signs of gas staining on the sides of the tank. If you see any
stains at all, they are probably from a leak.
Troubles with tank rust would not be caused by the new exhaust system,
other than, perhaps, the tank being bumped by the pipes during
installation and that causing already-frail metal to crumble. If you are
smelling true gasoline smells, they would not be coming from the manifold
or exhaust pipe joints.
While you are rooting around the fuel system, do check all rubber hoses
and their clamps. Even the 1980 car is now 20+ years old, and rubber
hoses perish with age.
Exhaust pipes acquire a blue tint near the manifold. It's just normal
heat causing this to happen. Check the mixture, but if it was OK before
the pipes were changed it should be OK now.
Bob
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