Re: IH 4200 Fuel Tank Problems - Rust.
I had the same problem. On mine (2009 6373) it was just the filler necks, they are steel but the tanks are not (or at least they are lined). So International put liners in the filler necks under warranty. I am also now running fuel treatment with every fillup to avoid algae, etc.
FYI - Mine is FOR SALE at I-35 RV in Denton TX. (7,000 miles w /AirRide and satellite, $120k) I moved up to a Showhauler on a Freightliner chassis.
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