the girl at the fuel dock put fuel in our water tanks? Partly my fault. I opened both fill ports because I was planning on taking on water as well but went down below for something. It only took a second. I saw her walking away but she must have changed her mind for some reason and come back and decided to pump the fuel. Usually they just drag out the hose and let you pump it. The girl apparently didn't read English because it was clearly marked "water". I stopped her and made the mistake of asking her if she had pumped any fuel into the tank thinking she might have just put the nozzle in the tank and not pulled the trigger yet. To my delight she said that she hadn't pumped any fuel yet, I asked her twice, not in a threatening way, and again she said that she hadn't. I thought "great! we dodged that bullet" and went about filling the rest of the fuel and water tanks. I should have locked that tank down right then and there. I could have tested the water later to be sure and saved myself a lot of work and the cost of a new water pump.

Later, back at anchor that night my wife went to take a shower and found that the water smalled like diesel. We drained the water and found that there was indeed fuel in the tank. Not only in the port tank but it was now in the bilge tank as well. It was now in the entire water system because we used the pressure water and pumped it through the system to the gally and shower. We had to replace the water system pump because the diesel destroyed the rubber parts in the pump and spend two days cleaning the water tanks. Maybe if I had let it sit for a few days in a marina and let the water and fuel separate out I could have cleaned it with less trouble but the water and fuel was thoroughly mixed up and spread through two of the three tanks. Of course in Mexico, you're on your own. The owner of the marina in La Cruz just said "you can't work on your boat here, you'll have to leave". That's it. We took a slip over in the old harbor so we could have dinner at "Victors" and licked our wounds. Lesson learned!