rgatijnet1 wrote:
I have restored several old Classic vehicles and old fuel tanks can be a problem. Most fuel tanks are coated/plated to prevent rust but that only lasts for so long. Once rust starts to form in a fuel tank, just flushing it out WILL NOT solve the problem. "Rusticles" will continue to form in the tank, even if it is full, unless it is flushed and the interior is coated/sealed with one of the numerous products on the market for this purpose. These "rusticles" are very fine particles and they will clog most filters and can get past most filters that are not designed for fuel injected vehicles.
X2
Ford had a problem with this about 10 years ago. They used a coating on the inside of the fuel tank that would break down and peel off. Once it starts it's hard to get rid of without replacing the tank or sandblasting the old coating off and resealing the tank.