Fuel Pump Relay for different automobiles
Your Fuel Pump Relay worn out? » Read more about common malfunctions • Repair • Replacement manual
The fuel pump relay is a small electronic device of the fuel supply in the car. It ensures that the pump presses the necessary amount of fuel through the injection nozzle at exactly the right time. The fuel pump relay is a durable component, but can be quickly replaced in case of a defect. The fuel pump relay function A relay is an electric switch, controlled by an electric impulse. It enables a weak power surge to close a power circuit through which a considerably higher current is running. Relays are frequently used for safe maintenance of high tension. A switch controlled by an electric impulse can be controlled very precisely, making it very practical for autonomous systems such as the car engine. With help of a control unit and several sensors the relay is able to exactly control the fuel pump, optimising the engine performance and its efficiency. Important data for fuel pump control are the aspirated air mass, the angle of the crankshaft, the required performance or the impulse of the ignition coil. The control unit calculates the necessary measure of fuel and initiates the corresponding operations very precisely and in milliseconds. Fuel pump relay construction The fuel pump relay is an electro-mechanical component consisting of an electric magnet, moving an internal pin. Through the electric impulse, the electric magnet's coil is activated, generating a magnetic field. This moves the pin, drawing it in the desired direction. The pin in its turn closes a contact, causing the necessary current for the fuel pump. The fuel pump relay is very easy to find and to identify: it is situated at the fuse box, where the flat fuses secure the separate electric circuits. The relay is a small cube with a plastic cap. Generally, the fuel pump relay is black, though other colours are possible. The relay is simply plugged into the contact board and can be removed by hand. Fuel pump relay defects A defect of the fuel pump relay immediately becomes apparent: the engine fails and cannot be started anymore. Especially during driving this is a real nuisance. With a bit of luck, it can be mended by hand. In order to narrow down the malfunction, the spark plug function should be checked. To do this, a spark plug should be disengaged and its thread connected with the vehicle's mass. It suffices to touch the engine block or the battery's negative pole with the spark plug socket. It is not recommended to do this by bare hand, as the ignition cable is under high tension. The secure version is a connection with tape or wire. A tip: the plaster found in the first aid box can help here. If the spark plug visibly generates an ignition spark, but the engine doesn't start, the relay is very probably defective. This breakdown can be prevented by regular replacement (e.g. every three years) of the fuel pump relay. This is a cheap and easy to replace component and its preventive replacement optimises the operational security of the car. Repair of the fuel pump relay The fuel pump relay is easily disassembled. By removing its cap, the magnetic switch' function can be checked. A visible pollution of the contacts may have caused the defect. The relay's contact pins may be corroded. This can be recognised by their black or green colouring. Cleaning the contacts, if necessary with a bit of fuel from the fuel hose can suffice as immediate breakdown solution. Replacement of the relay should follow. Purchasing a fuel pump relay at autopartspro.co.uk We from autopartspro are able to generate cheap prices by wholesale. We are happy to pass on the resulting price advantages to our customers. Therefore, we can offer the relay at a price of 10 euro (£ 9). These prices do not come at the expense of the quality: we consider ourselves an original parts retailer, exclusively trading branded quality. Buy therefore your new fuel pump relay by Bosch, FEBI-BILSTEIN, Verno or SWAG with us and benefit from our service and price advantage.