Risky business, but Got to be some good stories out there. Car had a Gas Generator running in back of vehicle with a battery charger plugged into it hooked to cables ran to the battery. Guy with a bad alternator claims it saved him a $200 tow. . Seen Cars and SUVs with bad fuel pumps started and driven into the the shop using off pressurized cans of fuel injector cleaner or gasoline filled in cleaner container and pressurized by a portable air tank. Saved pushing vehicle and if cleaner was used , customer pays for the injector cleaner service, while it save you and half the shop from pushing in The Turd. LOL