Very Fine Rust Particles in my gas tank
I just bought a 02 Ssei back in April. My check engine light has lit up three times. The first time they replaced an injector. The second time it was the same problem but they informed me they found rust in my fuel filter and I might have rust in my gas tank. They inform me the problem is most likely to continue and recommend changing out the fuel filter in about 10,000 miles. At this point I've got $900 in repairs in two visits. Two weeks later, the check engine light comes on for the third time. Same problem. They dropped the fuel tank and confirm there is a hell of a lot of rust (very very fine particles) in the tank The dealer informes me the tack is plastic and the rust must have been from bad gas. Also, he informs me I am looking at the minimum of a new tank, a sending unit and possibly injector replacments (if they can't be cleaned). A minimum of about $2000, maximum of 3500. I hope all the injectors won't need replaced for I drove the car to the dealer and it drove well.
I have a couple of questions:
What coud have caused this and how did this rust get into the tank. I am thinking flood damage, but carfax does not show this ( the car was a FLA car).
Is there a way to determine it'* rust and not silt ? Will rust stick to a magnet?
What are the tell tale signs that could disclose if a car was in some sort of flood or had water damage (maybe it'* rust in the gas tank!) What parts of the car can the dealer or I look?
Thanks and regards,