To start with, let's take a look at what biodiesel fuel actually is. At its most simple, biodiesel fuel is made from vegetable oil, animal fat, or mixture of the two. It's a clean burning fuel that is made from renewable resources hence the name biodiesel.
Generally, biodiesel fuel is made from straight vegetable oil, sometimes referred to as SVO. So if you want to make your own biodiesel fuel, you'll need to have an adequate supply of the basic ingredients. Unfortunately, most households don't produce enough waste animal fat or vegetable fat to come anywhere close to making enough biodiesel fuel to keep the family car running.
One thing to remember is that it's not quite this simple! Used vegetable oil needs to be mixed and stored, which can be quite a problem if you have large amounts of it. You also need to dewater, filter and deicide the waste oil before it can be used for making biodiesel. This makes the production of biodiesel fuel at home a lot more complicated.
Having said that, it's certainly still quite possible to make biodiesel fuel at home, simply by buying straight vegetable oil, rather than using waste products. Even though it will cost you a lot more, when you compare it to the cost of buying the necessary amount of gas to run your car for a year, you can still save an enormous amount - somewhere around 75 percent. Even better, you're saving the environment too.
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