Do-it-yourself fuel pump replacement

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

Depending on which injection system is used in the car, the replacement of the fuel pump also varies. It is worth looking at how fuel is supplied in carburetor and injection cars. Despite the fact that the first ones have not been produced for a long time, there are still a large number of them on the roads to this day. Yes, and some tuning enthusiasts prefer carburetor engines, since at low revs they are able to deliver torque and power higher than injection ones. But the latter are more convenient to use. The mere fact that there is no suction is enough.

Gasoline pump in carbureted cars

It has one small feature - it is driven by a cam mechanism located on the camshaft. There is no fuel pump relay in the design, since the drive is mechanical, no electronic control is provided. A simple diaphragm that is driven by a rod. A spring helps her return to her original position. Since the rod is constantly moving, the membrane also performsmovement without stopping. To ensure the normal supply of gasoline to the carburetor, a system of two valves is used.

To replace the fuel pump, you will need two tools - a screwdriver and a 13 wrench. First you need to loosen the clamps that fasten the fuel pipes as much as possible. Take them off carefully and replace if necessary. It is best to do this work on a cold engine. After that, with a key of 13, you need to unscrew the two nuts. This is the fuel pump housing. If you plan to replace the rod, then you need to install gaskets under the fuel pump. It is necessary to ensure the maximum rod overhang, it must be the same as indicated in the manual for a particular car. Further replacement of the fuel pump is to install a new one and connect the fuel pipes.

How does an injection engine work?

For reliable operation of the engine with direct injection, an element such as a gasoline pump is used. It creates pressure in the fuel rail, which is necessary for gasoline injection. In fact, there is nothing complicated in the process. The air-fuel mixture is in a compressed state. Solenoid valves (injectors) are installed in the ramp, which open and close the supply of gasoline. The feed is regulated by an electronic control unit, as well as a system of sensors connected to it.

Injection engine fuel pump

Here the design is already a little more complicated, and it makes no sense to look for a fuel pump in the engine compartment, since it is not there. It is located directly in the tank. Butno need to think that an elementary replacement of the fuel pump filter will result in the fact that you will need to dismantle the tank. Not at all, just lift the rear seat, under which you will see a layer of carpet or sound insulation. Closer to the right side is a square cutout that lifts up without harm to the car.

Under it you will see a plastic plug, which is fixed with two self-tapping screws. By unscrewing them, you get access to the fuel pump compartment. Two hoses are connected to it, as well as wires for connecting the motor and the float level sensor. The last two devices are combined into one node. To pull out the entire structure, you need to disconnect the plugs, disconnect the tubes, and unscrew the eight nuts. On most vehicles, they are unscrewed with an 8 wrench. Before starting work, get rid of dust so that it does not get into the fuel tank after removing the pump.

Checking the performance of the fuel pump

If you don't hear a rumble from the back of the car when you turn on the ignition, then most likely the fuel pump is not turning on. There can be many reasons for this. It is possible that the fuel pump relay has failed. But there may be more unexpected breakdowns, which are not always immediately recognizable. For example, wiring damage. Disconnect the power plug from the pump, measure the voltage on it. If it is not there, and the relay is working, then it is quite possible that the integrity of the wiring is broken. But before disassembling the entire interior to look for a break, check the fuse.

But it's notall the reasons why there may be no voltage at the fuel pump. Often the alarm unit fails. To prevent car theft, security system installers break the wire that goes to power the fuel pump. It is quite reasonable: if there is no power to the fuel pump, then it will not work, it will not create pressure in the rail, which would be enough for the engine to function. If the cause of the breakdown lies in the central alarm unit, then you need to find the place to connect the power contacts. And restore the factory wiring.

Installing a fuel pump

If the electric motor fails, then there is no point in restoring the structure. It is worth noting that it makes no sense to change the entire fuel pump, the price of which is 2500-2600 rubles. It will be cheaper to replace the electric motor with a pump. The price of this device is 1000-1500 rubles, depending on the manufacturer. But if you decide to change the filter and the fuel level sensor along the way, then the cost of all elements of the system will be approximately equal to the price of the entire assembly.

Installing the fuel pump will not take much time, you will need a key for 8, preferably a tubular type, as it is more convenient to work with. You will also need a screwdriver - Phillips or flat, depending on what clamps you are using. Install a new gasket on the studs, then carefully mount the fuel pump housing into the hole. After that, align the holes so that the studs get into them. Fit the nuts, then tighten them. Now it remains to connect the fuel pipes andput the plugs in place. It's easy enough to replace the fuel pump. "Priora" is one of the new domestic cars, but even on it the installation of the fuel pump is carried out according to a similar scheme.

Conclusions

Despite the fact that the pump is so far away from the driver, it must always be monitored. First, change the filter in a timely manner. Secondly, to clean the contacts of the electric motor from oxides. Please note that with a clogged filter, the engine starts to work under greater load, sometimes it does not even have time to pump the required amount of gasoline into the ramp. And if you start everything, let the filter collapse, then all the dirt will get into the nozzles, which will instantly clog. Timely replacement of the fuel pump and filter will avoid such disastrous results.