what do the sailor inform against gulliver to the pilot and with what result

The sailor informed the pilot that Gulliver is a stranger and traveler, which resulted in his confinement.

Some of our sailors, whether out of treachery or inadvertence, had informed the pilots "that I was a stranger, and great traveller;" whereof these gave notice to a custom-house officer, by whom I was examined very strictly upon my landing. This officer spoke to me in the language of Balnibarbi, which, by the force of much commerce, is generally understood in that town, especially by seamen and those employed in the customs. I gave him a short account of some particulars, and made my story as plausible and consistent as I could; but I thought it necessary to disguise my country, and call myself a Hollander; because my intentions were for Japan, and I knew the Dutch were the only Europeans permitted to enter into that kingdom. I therefore told the officer, "that having been shipwrecked on the coast of Balnibarbi, and cast on a rock, I was received up into Laputa, or the flying island (of which he had often heard), and was now endeavouring to get to Japan, whence I might find a convenience of returning to my own country." The officer said, "I must be confined till he could receive orders from court, for which he would write immediately, and hoped to receive an answer in a fortnight."