![]() ![]() ![]() Performance fuel rails generally feature a larger bore size and a higher flow rate. The pressure regulator mounts on the fuel rail too. In essence, it’s simply a solid metal bar with the fuel coming in one end and going out of the other, with outlets for the injectors along the way. The fuel rail is where the injectors mount. The fuel rail holds the injectors Fuel Rail If it cannot flow enough, it will become a restriction and cause increased fuel pressure. The fuel here isn’t under any pressure, so you must make sure the return line is of a suitable size. However, surprisingly, a chunk of power can be achieved with seemingly small-diameter fuel lines.Ī return line allows the excess fuel that the regulator bleeds off to return to the fuel tank (or swirl pot). For big power, larger diameter fuel lines often needed. A normal rubber hose will degrade and can even burst under the pressure. It’s important that any hose is capable of handling high-pressure fuel. It’s usually made of metal or reinforced rubber hose. The fuel feed line connects the main fuel pump to the fuel rail. Larger ‘race’ items are available for big-power engines and those running more exotic fuels but aren’t really needed for fast road cars. If unchanged, it could potentially cause a lean-running engine. It’s a filter, so by its very nature it will become blocked over time. Most standard filters can usually cope with the power increases we see. Fuel FilterĪs you’d expect, a fuel filter removes foreign objects that may block the injectors or cause damage to the engine. It’s better to get the correct sized pump in the first place. Specific fuel coolers are available to cure this but are seldom seen outside endurance racers. This can result in a loss of performance and increased risk of detonation due to the fuel being heated up. ![]() While an oversized fuel pump won’t over-fuel the engine itself (the fuel pressure regulator prevents this from happening), it will mean fuel pumped around the system happens too often. You can have a fuel pump that flows too much for your engine’s requirements. Upgraded pumps come in a huge variety of shapes and sizes, some of which are capable of flowing over 1000bhp-worth of fuel.īut don’t think bigger is always better, it’s not. However, upgrading the pump manages the fuel demands of highly-tuned engines.Ī powerful single pump is preferred to twin-pump setups these days Most modern fuel injection pumps can cope with the flow requirements of moderate power increases. Some Sierra RS500 Cosworth race cars used a backup mechanical fuel pump driven off the cams. Modern fuel pumps are electric, although older cars and some race cars use mechanical pumps. The fuel pump’s job is to pump fuel from the tank (or swirl pot) to the injectors. They can be almost any size you require, and often baffled, negating the need for a separate swirl pot. These cells are stronger and less likely to leak in the event of a crash or roll over. Fuel tank/cellĮverybody knows what a fuel tank is for, but on many highly-tuned cars the standard tank is replaced with a performance fuel cell. Let’s take a closer look and find out the truth about fuel injection systems. There are more components and certainly a lot more variables that need to be considered. The tank stores fuel, the pump takes fuel from the tank to supply the engine, and the injectors feed your engine with the required amount of fuel at the right time. Various fuel delivery systems are available, but the type we’re interested in for this feature is the most common system electronic fuel injection. However, when it comes to upgrading that fuel system (something you’ll need to do when tuning your engine), things can start to get surprisingly complex. The basics of a fuel system are simple enough to understand. Here’s our comprehensive fuel system guide. ![]() We take a closer look at one of the key areas of any internal combustion engine. ![]()
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