Damn! Stuff happens. Save your receipt(s) and get this noted in writing from a service - repair place that diagnosed it. Find out who another person(s) is/are that it happened to and keep in touch.
This could be very costly to you and others. Even more than what you were just quoted.
I worked at a few gas stations in the 70s. It happens. The issue then was water which is not added to fuel to dilute a costly product but that it gets in the fuel in storage all along the way. Condensation and ground water can and was higher than the tanks at one place I worked and did seep into the in ground tanks at the station as they were steel tanks.
Every place I worked then (might be out-of-date now) had a schedule to "stick" the tanks with a paste that detected the water level which WAS ALWAYS THERE but when at a certain level was pumped out. The problem then and now is when you fuel up when the place is getting fuel it mixes up like shaking up salad dressing - no joke - don't buy fuel when the place is getting fuel.
Story: That was good old days and we knew our customers (I didn't own the place) and would just tell them to come back later if we were getting gas. One day I noticed in the trap area of a then rare "unleaded" fuel car that the gas had junk and water there before it trickled down. "Hey Boss!!" We have a problem!! I yelled! We stopped pumping and didn't a lady with a Beamer walk back just a 1/4 mile away unaware of what happened but it choked on water.
Station owner didn't own the tanks or pumps - Mobil did. They took full responsibility for any person who complained of troubles and of course would like me to shut up which wasn't going to happen as these were our friends and customers. We couldn't just put a sign out saying it happened of course as everyone who ever had a problem would or could jump on that and get out of hand.
Then like now, I really don't think anyone did this on purpose. It's just the potential for a major headache for everyone. It clearly happens more back then than now with mandatory replacement of the tanks at a certain age.
Good luck with that,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/