La electric fuel pump It is the heart of every electronic injection system, so it is necessary to review the basics of this fundamental part of fuel injection.
It is usually found in or near the fuel tank, it must do double duty: push fuel from the tank to the injectors, and create enough pressure for the injectors to deliver the correct amount of fuel under all operating conditions.
The pressure developed by the pump, as well as the volume of fuel flowing, both must meet the requirements of the car manufacturer or the performance of the engine, so some will affect issues such as economy and emissions. The amount of fuel pressure needed for a given application will vary depending on the type of injection system, the flow characteristics of the injectors, and the fuel needs of the engine.
Una fuel pump Not meeting the minimum fuel flow or pressure requirements for the car can cause drivability problems and heavy emissions. A fuel pump weak that cannot generate enough pressure can alter the calibration of the fuel system. This can cause the engine to run dry or not run on the fuel you put into it, causing symptoms such as hard starting (hot or cold), low power, hesitation or sluggishness when accelerating, as well as a loss of power on high. speed.
La low fuel pressure It can also be a cause of misfires when the car is at rest and under electrical load, leading to increased hydrocarbon emissions. A car experiencing this type of problem usually fails an emissions test that measures emissions under simulated driving conditions on a dynamometer.
Low fuel pressure and/or misfire can also turn on the check engine light on any car, whether modern or with some life. Therefore, if the fuel pump original is weak or has failed, it is important to make sure that the fuel pump replacement meets all fuel performance specifications.
All the electric fuel pumps they run constantly, so after many years of service they may experience wear on the armature, brush and commutator bushings. Pump vanes, rollers or gears can also cause a gradual loss of pressure and flow through constant use. Accelerated wear can also occur from deposits or rust. In some cases, using a pump from a different car can cause the engine to overheat and burn out.
La fuel pump It is where the fuel passes for its lubrication and cooling. Consequently, lack of fuel can be another factor that accelerates wear and can even cause damage to the pump under certain conditions.
If the fuel pump stops working (no noise, no line pressure), the first thing to check is the supply voltage of the pump and the electrical connections. An open relay, blown fuse or loose wire whatever is affecting the pump. Also low battery voltage can also reduce the capacity of the pump by generating pressure, which reduces the operating speed of the pump motor.
A measurement of the static outlet pressure and fuel distribution are the two standard diagnostic tests that can be used to determine the ability of a pump to deliver fuel.
If the static pressure or the volume of fuel distribution are less than the car manufacturer's specifications, the fuel pump will need to be replaced. Replacement would also be necessary if the pump valve is unable to contain residual pressure in the system after the engine is shut off.
The information provided was excellent, it came to corroborate (strengthen) some of the concepts that were not entirely clear to me. Excellent page also, congratulations for a job well done.
Hello, I would like to ask a question... 4 months ago by mistake at the gas station inves de diesel they put gasoline on me... (opel astra) after 25 minutes the car jerked and stopped... they cleaned ducts, filter etc... pour more diesel…but it has continued to have problems…or after a while it stops by itself…or if you turn off the ignition it won't start again until about an hour has passed…and the problem continues…(I'll say that I've never had problems with the car before that they put gasoline in the car. The workshop where it is now...first it says the revolution sensor...okay it's fixed now it tells me that the pump is faulty (and at the moment it says electrical part).and it tells me that it has nothing to do with it with the gasoline that they poured on me... can someone help me please clear up any doubts...
A greeting….and by the way good article. Thank you
I would like to know possible causes in a Chery Face where the fuel pump punctured the fuel tank when on the highway it was going at 100 km per hour. The pump goes into the pond. It has happened to him 2 times.
My problem is: when I start the engine, the needle marks me well, I mean the oil marker, but when driving it goes to the bottom and turns on the emergency light, I stop it and check again and it continues down when I drive again, it goes up and down, I always use the Tuesday I'm full and I'm worried
I have a 98 blazer. I have changed the fuel pump three times, I cleaned the tank but it still happens to me that sometimes it does not start and after insistently hitting the tank the engine starts. It has me baffled because the last time after two hours and many blows the engine started. What can be?
Hello. I have a 99 blazer. I would like an explanation regarding the fuel pump since in the morning the truck does not start and I have to add a little gasoline to it so that it can start. This pump has three outlets in the cap. I would be grateful if you could explain to me the function of each one. Many thanks
Hello. I have a 99 blazer. I would like an explanation regarding the fuel pump since in the morning the truck does not start and I have to add a little gasoline to it so that it can start. This pump has three outlets in the cap. I would be grateful if you could explain to me the function of each one. Many thanks