The phrase "direct fuel" refers to a type of fuel that is used directly in a process without any additional steps or conversions. It is a straightforward fuel that can be used as it is, without needing any further modifications or treatments.
This mill is integrated with direct fuel injection technology. (cardekho.com)
In S - trim the 3.4 - liter unit, now with direct fuel injection, is good for 310 hp. (jalopnik.com)
The cooling effect of direct fuel injection also ensures a compression ratio quite unusual on a turbocharged engine, helping to give the engine an even higher level of all - round efficiency. (topspeed.com)