Need help installing new fuel pump
I have the part and have the old one out but i cant figure out the wiring for the new pump. It seems different from the old one. The new pump came with new wiring harnesses but i don't know how to install them.
My car has 100000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Without seeing the old pump and the new one it would be hard to really help you. Aftermarket pumps sometimes come pre-wired and other times you have to splice it in. If you need help with the installation, I’d suggest contacting a certified mobile mechanic who can come replace your fuel pump at your own convenience.
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A poor connection can cause enough resistance to lower the amount of voltage reaching the pump. This causes the pump to turn more slowly than it should, and can shorten the life of the pump. Replacing the vehicle side connector should solve the issues with poor connections, but sometimes causes another problem.
The biggest difference between electrical and mechanical fuel pumps is that mechanical pumps rely on moving parts to pull fuel out of the tank and into the engine, whilst electrical pumps use electricity and computer power to push fuel to the engine.
The basic operating system for an electric fuel pump is relatively simple. When the key is turned on, the powertrain control module (PCM) closes the fuel pump relay, which activates the fuel pump for about three seconds to pressurize the fuel injectors.
Supplying high-current devices like a fuel pump requires heavy-gauge electrical wire; the longer the circuit the larger the required conductor diameter.
The Fuel Pump function is used where the ECU will be controlling an electric Fuel Pump. ECU control is preferred for safety reasons to ensure that the fuel pump is turned off in case of an accident.
The universal fuel pump should be mounted below the fuel tank, as all fuel pumps do not have equal lift capabilities. Also, the pump must be mounted below the carburetor to avoid possible vapor lock conditions from occurring.
A voltage of at least 12.5 – 13.0 volts must be present when the engine and pump are running. If the measured voltage at the terminals or the plug of the pump is significantly lower than the on-board voltage, e.g. lower than 11 volts, there is a malfunction.
The ignition switch will momentarily provide power to the fuel pump and ignition system when it is in the cranking position, which may allow the vehicle to start. However, if it has failed in the “on” position, it will cut off power to the fuel and ignition systems as soon as the key is moved back to the “on” position.
Mounted either inside or near the fuel tank, electric pumps hook up using power and ground wires, and use OEM-quality gerotor designs or rotor/vane designs to push a steady stream of fuel to the engine. As the pressures are higher with electric, a fuel pressure regulator is usually needed.
Leave the mechanical pump in place and put an electric one by the tank: You can do this if you want to keep your mechanical fuel pump as a backup in case your electric fuel pump gives out. This is arguably unnecessary because electric fuel pumps are designed to last a long time.
While a motor is itself a driving mechanism which can be used to power another device, a pump is a mechanical device which requires a driving mechanism in order to function. Motors use electrical energy to produce mechanical energy, while pumps in Lethbridge use mechanical energy to perform work.
Electronic Control Unit (ECU)
It uses engine RPM and signals from different sensors to meter the fuel. It does this by telling the fuel injectors when and how long to fire.
There are two types of Electric fuel pumps: Electric In-Tank Fuel Pumps and Electric External Fuel Pumps. Electric In-Tank Fuel Pumps are more common than the Electric External Fuel Pumps. Electric In-Tank Fuel Pumps This pump is mounted in the fuel tank of the vehicle itself.
The ignition circuit, which includes the ignition switch, controls power to many components, including the fuel pump and relay.
It depends on how long the wire run is, how thick the wire is, how much current the pump draws, and what other types of controls you want on the pump circuit. Low current pump, short heavy wire, no funky control requirements means you can go without a relay.
The ECU then sends a command to the fuel pressure regulator via a duty cycle to achieve the desired pressure. The fuel pressure sensor is a three-wire device with battery voltage on one wire, earth on another and the third wire is the signal wire.
The fuel injection rate is controlled by an ECU, which calculates the amount of fuel to be injected based on the signals from the sensor that detects the amount of air intake and controls the length of time to keep the fuel injection valves (injectors) open.
You can use one of the ME ECUs Slow/Relay Low Side (LS) drivers to drive the fuel pump. Note this must be done via an automotive four-pin relay as fuel pumps can draw 20+ Amps. If you do not have enough Relay Low Sides, then you can of course use a PWM Low Side instead.
As a result, it is often the case that original replacement mechanical pumps are no longer available. If this is the case, the installation of an electric fuel pump is a practical, cost-effective solution.
Electric fuel pumps can be used as lift pumps to mechanical pumps, moving fuel from a tank to the location of mechanical pump. Such a situation as a large low mounted fuel tank up to the engine mounted mechanical pump high pressure injection pump.
Suitable for all Pumps.
Electric fuel pumps can be used as lift pumps to mechanical pumps, moving fuel from a tank to the location of mechanical pump. Such a situation as a large low mounted fuel tank up to the engine mounted mechanical pump high pressure injection pump.
As a result, it is often the case that original replacement mechanical pumps are no longer available. If this is the case, the installation of an electric fuel pump is a practical, cost-effective solution.
Electric fuel pumps can be used as lift pumps to mechanical pumps, moving fuel from a tank to the location of mechanical pump. Such a situation as a large low mounted fuel tank up to the engine mounted mechanical pump high pressure injection pump.
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ANSWER : Hey there, thanks for writing in about your 1996 Chevrolet Blazer. If you hear the pump, but still get no fuel out of the pump, then you have the power and ground backwards in the wiring or they have it backwards on the pump. If you need help having this checked, a certified professional from YourMechanic can inspect the starting issue and let you know what repairs are necessary.
Read Full Q/A … : Need help installing new fuel pump
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ANSWER : Hi there – I suspect you have weak power getting to the fuel pump. I would first check the voltage coming out of the fuel pump relay. If the contacts in the relay are burned, you will not get reliable current flow to the pump. Check the fuel pump ground as well (voltage drop across the ground, not just continuity). I recommend a fuel system inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.
Read Full Q/A … : Need help installing new fuel pump
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ANSWER : You need to look at the theft light on dash to make sure it comes on and goes off when you turn the key to the on position. If light comes on and stays on then your theft system is causing the fuel pump to not be engaged. I recommend you check the theft system and then scan the computer for theft system codes. You may need to reprogram the keys to work or you have an bad sensor for the ignition key in the steering column.
Read Full Q/A … : Need help installing new fuel pump
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Read Full Q/A … : Need help installing new fuel pump
I have a truck that won’t run and is not getting gas to the engine. Fuel pump is running, have a new filter and new fuel pressure
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It sounds like you may have a clogged fuel injector or potentially a faulty injector that is fried internally. I would suggest testing them if you have access to a multi meter. Disconnect the injector from the electrical connector and set your multi meter to Ohms mode and measure the resistance of the injector. After testing all injectors, compare the resistance. They should be the same or very close. If they are not, they will likely need to be replaced.
It sounds like you may have a clogged fuel injector or potentially a faulty injector that is fried internally. I would suggest testing them if you have access to a multi meter. Disconnect the injector from the electrical connector and set your multi meter to Ohms mode and measure the resistance of the injector. After testing all injectors, compare the resistance. They should be the same or very close. If they are not, they will likely need to be replaced.
Read Full Q/A … : Need help installing new fuel pump
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Read Full Q/A … : Need help installing new fuel pump
I have a 1981 e-350 with dual fuel tanks the p.o. added a third tank and 3 electric fuel pumps along with sepparate gauges and swi
ANSWER : The switch you are referring to is vended with the required electrical and fuel schematic (I just looked in the box) that answers your installation question. If you want an advance view, here is a link as well. Yes, you need a return line and just refer to the aforementioned link. If you are retrofitting back to OEM, I strongly encourage you to buy the original Factory Service Manual (FSM). There are lots of details attending this system and obviously it is difficult to recount it all here. The FSM will make your life much easier and you can then make sure your installation is perfect. Alternatively, YourMechanic can dispatch a certified mechanic and perform the whole retrofit and check out if you desire. Just request and schedule a generic service such as fuel pump service and the mechanic will come to your location and estimate the parts and labor required. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.
Read Full Q/A … : Need help installing new fuel pump
Fuel pressure
ANSWER : Hello,
You may want to try checking the fuel pump relay. The relay wires should have ground on two wires, power on one wire and switched power on another wire. To activate the fuel pump your ECU actually connects one of the ground wires to complete the circuit and send power to the fuel pump. If the wires all have power running through them, then it is likely you have a faulty relay. The wire coming from the fuel pump is the other ground wire. I would recommend having an expert from YourMechanic come to your location to diagnose your wiring as this can be very difficult and time consuming without the proper wiring diagram.
You may want to try checking the fuel pump relay. The relay wires should have ground on two wires, power on one wire and switched power on another wire. To activate the fuel pump your ECU actually connects one of the ground wires to complete the circuit and send power to the fuel pump. If the wires all have power running through them, then it is likely you have a faulty relay. The wire coming from the fuel pump is the other ground wire. I would recommend having an expert from YourMechanic come to your location to diagnose your wiring as this can be very difficult and time consuming without the proper wiring diagram.
Read Full Q/A … : Need help installing new fuel pump
