Electric Fuel Pumps - Design, Work and Faults

Electric fuel pump is utilized in modern internal combustion engines to provide fuel from the gas tank to the injectors. The pump must deliver fuel under high pressure, so the nozzle can spray it in the engine. For the proper engine performance fuel pressure should be included in allowed specifications for a given engine. Too much pressure causes uneven engine running too rich mixture, and excessive contamination.

Electric fuel pumps are usually installed in fuel tank (intake), even though some can be set up outside. The positioning of the pump in the gas tank helps permeate the buzzing sound of pump's electric engine. Submersion into the gas helps lubricate and cool the pump's engine. Driving with fuel tank filled with over 1/4 of its volume can shorten the life of the pump and cause rapid overheating. It also increases risk of pump left with no gasoline through rapid acceleration or deceleration.

The pump is usually a part of a module which also includes a float that carries electrical signals to the degree indicator, located on the dashboard. If the gas pump needs replacing, it may be replaced separately or the comprehensive module assembly (it is pricey, but much easier).

Different electrical fuel pumps have different layouts. This type of pump can produce very high pressure and constant flow. But at the outlet of the fuel pump has been strong pressure fluctuations, so often from the gasoline line after the pump was installed damper to reduce the amplitude of pulsation of gas pressure. Circulating room can also be set up away from the tank and utilized with the second low-pressure pump installed in the fuel tank.

There is another form of gas pump - out "rotor-type". This layout is similar to layout of the oil pump and uses the counter rotor to push the gas through the pump. Another variant of the roller pump - out "vane-type". The blades are utilized instead of pliers to push the gas through the pump. Most modern cars use a pump turbine. Blades of the impeller push gas through the pump. Turbine type pumps do not create the pressure fluctuations these kinds are less complicated to fabricate and more reliable in operation. It's likely to replace a fuel pump by not original unit. In this case fuel pump's output must be within original specifications and as consumption just like the original one. Use of an improper specs may lead to deterioration of performance of the car.

How does electrical fuel pump function?

When the ignition, the digital control unit excites the relay, which supplies voltage into fuel pump, its engine starts to rotate, and within a few minutes it creates necessary gas strain. Outlet of this pump the gas moves through the check valve, single acting (valve maintains a residual pressure inside the machine, when pump does not work) and feeds to the motor through the fuel line and filter. The fuel filter catches any rust, dirt and other solid contaminants which have passed through the pump to prevent the penetration of the particles in the injectors.

Further, the gas enters the fuel rail, located on the motor and from the railing to each injector. Gas pressure regulator, situated on the ramp, maintains the gas pressure and melts any excess back into the tank. Start рециклиране на дюзи and the electric fuel pump starts to function continuously and also to keep pumping gas before the engine is operating. If the engine stops, then the digital control unit receives a signal in the sensor and the crankshaft ECU will turn off the pump.

10.05.2018 16:52:46
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