Auto Parts: Gas Tank, gas tank, best bet

Question
Hi, is it possible to replace the fuel tank to a bigger one ? because I own a car with 4L engine and I want to replace the engine with a 7L engine but should I replace the fuel tank too ? If yes can you tell me which Gas Tank should I buy (by name if possible)...

Answer
well that really depends on what kind of car this is. the only reason you would have to change it is if you want to travel farther on a tank of gas( assuming the 7l gets worse mileage than the 4l). if you do decide to change it first check to see if the car came with the option of a bigger tank from the factory. if it did i would go with that. if not you best bet would be to run a fuel cell. they can easily be mounted in the trunk with very little work. there are several companys that make them, all are about the same. some do things a little differently than others depending on what thier marketed towards.( hot rods or off roading and such)