First you have to figure out what caused the hole. A perfectly round hole with a formed depression probably had a rubber grommet poked into it with a hose or valve in the middle. I've seen screws run into gas tanks from people trying to mount something like speakers inside. A jagged hole with an irregular shape was likely caused by a rock getting stuck up there. A bolt hanging down could pierce it too if the tank was run into it while being reinstalled.
Your vehicle has a monitoring system for large and small leaks. However the hole is patched will have to have a perfect seal to prevent setting a diagnostic fault code and turning on the Check Engine light.
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Tuesday, September 15th, 2015 AT 10:15 PM