A variation on the theme above: Self drilling screw w/ the rubber clad washer. Either buy one like that, or make your own at the hardware store. They'll have the thin rubber washers in the drawers with all the other "specialty" type fasteners and such. Typically the head on the screw is 1/4" so a nut driver would be all you'd need to install...or a battery powered screw gun.
Option 2: Epoxy Steel Putty. This is an epoxy that comes like a Tootsie Roll candy. You simply cut off the amount you need, and then roll it around between your fingers to mix the outer part with the inner part. Then press in place and hold for a few minutes. It's done cooking in 5-10min and hard as steel. To use this method, you'd want to clean the area around the hole with carb cleaner really well. Then rough the area with 60grit sand paper. If the hole is going to continue to weep/drip while you're doing the repair, get the epoxy cut and ready to mix while holding a finger over the hole. Then quickly shove the epoxy into position and press firmly.
Otherwise, play it safe and get it towed home. The last thing you want is a blown motor because you tried to save a nickel.