Fuel not getting to motor

I just had a new fuel pump installed in my car and now the fuel is not getting to the motor.
Experienced mechanics share their insights in answering this question :
The fuel system on your vehicle is pretty simple. It consists of the fuel pump, lines, filter, pressure regulator and injectors. Either the fuel pump did not get installed correctly, or it was not the problem to begin with. A clogged fuel pump, restricted line or faulty regulator could also prevent fuel from getting to the engine. In addition, fuel could be getting to the rail but the engine control module (ECM) may not be commanding on the injectors. The first step it to check for fuel pressure. If pressure is sufficient but the engine is still not getting fuel, injector control (pulse) can be checked with a void light. I suggest having a trained mechanic, such as one from YourMechanic, diagnose your vehicle and replace your fuel pump, or any other components of this system, if needed.

How to Identify and Fix Common car Problems ?

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Clogged Fuel Injectors

One potential reason for this could be dirty fuel injectors. Over time, the fuel injector nozzles can become clogged with rust, corrosion or debris. Once clogged, the fuel injectors may not add the correct amount of fuel to the cylinders, and the vehicle may not start up at all.

Over 750,000 2018-2020 Hondas and Acuras have been recalled for a bad fuel pump. So, owners of a Honda Accord, Civic, CR-V, Fit, HR-V, Insight, Odyssey, Passport, Pilot, or Ridgeline, or an Acura ILX, MDX, NSX, RDX, RLX, or TLX that stalls or won`t start should know about the problem.
The problem with the fuel pumps in question is that they were exposed to solvents during production for so long that they became susceptible to surface cracking and fuel absorption, according to the National Highway Transportation Safety Administration.
Honda is recalling certain 2015-2017 Accord vehicles equipped with a 3.5L V6 engine, due to an issue where fuel residue may adhere to the internal components of the fuel pump, reducing its performance. The problem could prevent the engine from starting or cause the vehicle to stall.
The fuel injection system operates on the common rail principle in which timing valves, operated by cams on the camshaft, control the injection of fuel from a high-pressure manifold through spring-loaded injectors to the cylinders (Figure 14.12).
Electronic Control Unit (ECU)

The ECU is the brain of the operation. 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. The ECU often controls other functions like the fuel pump and ignition timing.

A failing/failed fuel pump will cause major performance and drivability issues with your vehicle. If your fuel to air ratio is off and the cylinders aren`t getting enough fuel, then the pistons aren`t firing and your engine is struggling to move the vehicle forward.
Step 1: Turn the key to run position. Locate the reset button to the fuel pump shut off switch. Press and hold the reset button for about 20 seconds. Note: The fuel pump shut off switch reset button is usually located either under the dash in the driver compartment or under the driver or passenger seat.
Fuel pump failures tend to be sudden and unpredictable, with few symptoms to warn the motorist that trouble is brewing. And the higher the mileage on the vehicle, the greater the risk of a fuel pump failure.
The Fuel Pump Driver Module controls the voltage delivered to a vehicle`s fuel pump. By controlling the voltage, the module maintains optimal fuel pressure and fuel delivery to the engine throughout its full operating range.
A fuel injector atomizes the pressurized fuel. It also injects it into the combustion chamber. In comparison, fuel pumps pressurize fuel and send it through the fuel line and fuel injectors. Fuel injectors decrease the pressure within fuel systems, and fuel pumps increase the pressure within the fuel system.
A pipe called the fuel rail supplies pressurized fuel to all of the injectors.
Fundamentally, the engine ECU controls the injection of the fuel and, in petrol engines, the timing of the spark to ignite it. It determines the position of the engine`s internals using a Crankshaft Position Sensor so that the injectors and ignition system are activated at precisely the correct time.
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.
At engine start and for preheating the fuel when temperatures are low, the rail pressure is controlled by the PCV. To heat up the fuel quickly, the high-pressure pump delivers and compresses more fuel than is needed and the excess fuel is discharged by the PCV into the fuel return.
The only things that are likely to cause fuel not to return are either a failed fuel pressure regulator, or an obstruction in the fuel rail.
A bad fuel pump may overheat and inadequately deliver gas to the engine, causing it to run hot and turn off while on the road. In this scenario, your vehicle may start back up after overheating and shutting down, only to do the same thing a half-hour later. This scenario is a common sign of a bad fuel pump.
Just because you hear the fuel pump run does not mean it is pumping the correct pressure to the injection system. If the pressure is real low or the filter is plugged solid, then the pump may not get enough fuel to the fuel rail. The only way to know is to test the fuel pressure at the fuel rail test port.
Listen for the fuel pump: Put your ear near the fuel tank and have an assistant turn the ignition key to the “on” position. The fuel pump should make an audible noise if it`s working properly. Whack the fuel tank: Have an assistant crank the engine while you hit the fuel tank with a rubber mallet.
The inertia switch is located behind the trim on the left-hand side of the vehicle, forward of the front door post, below the fascia.
Look into the fuel pump to see the filter, which will look like a screen. Don`t try to remove the filter, but instead use a clean paint brush to sweep away any debris blocking the filter. You can dip the paint brush in new gasoline to make it easier for the debris to stick to the bristles of the brush.
The fuel pump relay is a necessary component for the combustion engine model to function. The combustion engine needs fuel to run, and the fuel pump relay ensures that that engine gets what it needs. It is usually controlled by the ignition or the power control module.
The fuel pump relay plays an integral role in getting fuel to your engine for combustion. Powered by the ignition and/or powertrain control module (PCM), the fuel pump relay`s main function is to provide the fuel pump with enough power. When the fuel pump relay isn`t working, then the fuel pump cannot either.
While each type of fuel pump works a little differently, they all serve the same purpose—to move fuel through the system and into the combustion chamber. The three types of fuel pumps we`re covering today are: the rotary pump, the inline pump, and the high-pressure common rail pump.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Just replaced my fuel pump but its not getting any power tested fuel pump relay and fuel fuse both good tested the wires all good.
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.

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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
ANSWER : Hi There,
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.

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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.

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Engine is getting fuel to filter but don’t know if it’s getting to the injectors?
ANSWER : If you have tested the fuel pressure and it is OK, you know that fuel is getting to the injectors. So the question becomes whether the injectors are tripping. That can be determined by placing a stethoscope against the injector while a helper cranks the car. you can hear if the injectors are working. If your car runs on the starting fluid, then it must not be delivering fuel for some reason so my guess is that they are not. Diagnosing that condition takes a pretty thorough knowledge of the fuel injection system, so if that is not you, you should have a professional take a look. You can have that conveniently done by contacting Your Mechanic. They will send a technician to your home or office to check out your Nissan and let you know what it is going to take to get it starting again.

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the car is acting like its getting to much fuel. changed the fuel pump, fuel filter, and the fuel pump relay.
ANSWER : There could be a few things contributing to your problem. You are correct that clogged or sticking fuel injectors and possibly the fuel pressure regulator could be faulty. A plugged catalytic converter can also cause the vehicle to bog down. A failing throttle position sensor can cause the symptoms you describe as well. I suggest having a certified technician, like one from YourMechanic.com, do a few tests to determine the exact cause of your starting concern.

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Not getting fuel from fuel tank replaced fuel pump and filter I have a 85 720 nissan pick up
ANSWER : Hi there. I would recommend checking the fuel pump fuses to be sure the fuel pump is getting power to it. Also, check the ground wire to the fuel pump as well as this is a common issue when they become loose or burnt or shorted. If the pump is working, check to be sure the pump is moving the fuel to the throttle body. If this is not working, you may have an issue related to the power to the injectors. I would recommend having an expert from YourMechanic come to your home to diagnose the related electrical circuits to pinpoint the problems.

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Pulled motor and put in a newer motor but can’t get motor mounts to line up ?
ANSWER : The first thing to do is to compare the motor mounts on old and new motor to make sure they are the same on each motor and swap them if they are not the same.

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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.

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