HOW DOES A FUEL INJECTOR WORK
A fuel injector is nothing but an electronically controlled valve. It is supplied with pressurised fuel by the fuel pump in your car, and it is capable of opening and closing many times per second. When the injector is energized, an electromagnet moves a plunger that opens the valve, allowing the pressurized fuel to squirt out through a tiny nozzle. The nozzle is designed to atomize the fuel — to make as fine a mist as possible so that it can burn easily.
My injector appears to be leaking at the hose. Can it be repaired?
Injectors that have a hose leading to the fuel rail very rarely leak from the hose. 99% of the time the injector is leaking from the body between the plastic and the metal body.
These injectors cannot be serviced and must be replaced with new units. If it has happened to one injector you can be sure that the others aren't far behind