A fuel pump burns a mixture of petrol and air. Petrol in a fuel pump is pumped along a pipe from the tank and mixed with air in the carburettor, from which the engine sucks the mixture. In the fuel injection system used on some engines the petrol and air are mixed in the inlet manifold. A fuel pump draws petrol out of the tank through a pipe to the carburettor. There are different types of fuels pumps. A mechanical fuel pump is driven by the camshaft or by a special shaft driven by the crankshaft. As the shaft turns, a cam passes under a pivoted lever and forces it up at one end.
The other end of the lever, which is linked loosely to a rubber diaphragm forming the floor of a chamber in the pump, goes down and pulls the diaphragm with it. When the lever pulls the diaphragm down, it creates a suction that draws fuel along the fuel pipe into the pump through a one-way valve. As the revolving cam turns further, so that it no longer presses on the lever is moved back by a return spring. A fuel pump is very important to a vehicle. Always keep it healthy and happy. Now frankly just how much is due to the pump itself? Relatively little, most pumps can warp up to a higher rpm on demand if a vehicle needs it but for the most part it’s the fuel pressure regulator that controls this. These regulators show up in the craziest places: the early Mercedes was built into the fuel filter, most early domestics ended up in the return side of the fuel rail, and now with the advent of return less fuel systems the regulator as become a part of the pump.
This is just one of the reasons that the price of fuel pumps have been climbing. To add even more cost to this pump, manufactures have incorporated the fuel sending unit onto the pump as a way to decrease the cost of fuel tank manufacture and to make electrical circuits and harness’ easier use. Thus if your fuel pump stops pumping, you need a fuel pump.