If it's just old fuel it can be cleaned fairly easily. Many radiator shops will boil it out for you. If there's rust involved it'll need to be acid cleaned and coated. If that's the case I agree with Scott, replace it if you have that option.


Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.