My truck will stall as if it has no fuel getting to the injectors

while driving down the road my rpms start to fly all over and the ride gets very jerky and rough. the rpms will go all the way up to 5000 then drop then back up randomly and then down to 0 and stall. do you think this could be the fuel pump?

My car has 125000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
The problem you describe sounds like the fuel pump is getting hot and stops pumping causing the first erratic running and loss of power and then stall. You did not mention if it starts back up or has to sit for awhile to start again. If you have to wait to start then it most likely is the fuel pump in the tank. Also replace filter and electrical connection to the fuel pump since the connector will loose contact and cause pump to overheat and cause pump failure.

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With ignition “ON,” engine “OFF” and fuel pump running, pressure should be 415-455 kPa (60-66 psi).
Sputtering Engine

Your fuel pump doesn`t stop pushing gas through to the engine once you`ve started your vehicle; it also pumps gas to meet your vehicle`s speed. If the pump cannot produce a constant stream of gas at higher speeds, your vehicle`s engine will sputter and threaten to stall.

Fuel Pressure

These late-`80s and early-`90s TBI injectors are intended to run at between 11 and 13 psi, although it`s typical to see the pressure down around 10 psi. Generally, a 1-psi change in fuel pressure—from 11 to 12 psi, for example—can be worth roughly an additional 4 percent fuel flow.

Best Answer. Take off the upper intake, the regulator is on the backside of the fuel injector unit “spider”.
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.
Low fuel pressure can lead to engine misfires, low acceleration, rough idles, and engine stalls. If your check engine light is on and your car has been stalling out, you may have a fuel pump failure.
The most common reason a pump fails is wear on the pump from improper lubrication or over-use. The best way to explain a failed fuel pump due to wear and tear is to explain what other reasons may have lead to a failed pump: Most fuel pumps are lubricated by the fuel in the tank itself.
With the fuel pressure gauge attached, start the engine and let it idle. Disconnect the vacuum hose from the pressure regulator; the pressure should drop approximately 8 to 10 PSI. If it does not, suspect a problem with the regulator or its` vacuum supply.
Your Vehicle is Stalling and Sputtering

Rough running can also happen as a result of a faulty fuel pressure regulator. There are some cases where you will not be able to start the engine at all.

With all-new components and modern updates, this General Motors Gen 1 350 V8 puts out a reliable 210 hp and 300 lb. -ft.
The fuel pressure regulator is set for approximately 12 psi (30 psi on `94 & `95 BBC trucks). With a service range of 9 to 13 psi being considered good.
Fuel pump or clogged filter. Should be 58-62 psi.
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.
Gas pumps are mechanically designed to automatically stop pumping gas as soon as the tank is full. The nozzle valve shuts automatically once the gasoline blocks the air in the Venturi tube.
Car stutters and stumbles—the first sign of a bad fuel pump is intermittent coughing and sputtering that can`t be explained. If you`re sharp, you`ll fix the problem at this stage before it gets worse. Excessive whine from the fuel pump—modern electric fuel pumps will get noisy before failing.
Fuel pump or clogged filter. Should be 58-62 psi.
Fuel pressure for most vehicles should stay in a 5- to 10-psi range. But, techs should make sure to look at the service information for the specifications. Other data PIDs used to regulate the fuel pump include the engine position sensors.
Fuel pump or clogged filter. Should be 58-62 psi.
The fuel pressure regulator is set for approximately 12 psi (30 psi on `94 & `95 BBC trucks). With a service range of 9 to 13 psi being considered good.
For those of you not familiar with the LS1 fuel system, a typical working setup should run 58 psi of base fuel pressure, where as ours was around 52 and would drop well into the 40s under mild acceleration.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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.

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.

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.

Not getting enough fuel car will not run right. It stalls when you give it gas and stalls when it’s running. It’s a 1984 Ford Escort.
ANSWER : Hi there, thanks for writing in. Several early 80’s Ford’s swapped from carburetor to fuel injected engines; including your ’84 Ford Escort. However, there were two different fuel systems available that year. If your Escort has the fuel injected engine, one item I’d check is the EGR valve or clean the throttle body.

Both systems impact fuel delivery into the engine and if they are dirty or clogged with excessive carbon build up, can starve the engine to create this type of issue. If it’s the carburetor version, the carburetor might need to be rebuilt, or may be an issue with float bowls inside the carb.

If you need assistance diagnosing the exact issue, feel free to contact one of our professional mechanics to complete an engine is stalling inspection firsthand at your own location.

What are the odds of all injectors(or however many it takes for truck not to start) get clogged up. Truck was running fine and now it won’t start.
ANSWER : Hi there. Check the fuel injectors for power to the harness on each injector. Make sure that there is a voltage reference. If there is no voltage reference, then there may be an issue with the main harness from the computer to the injectors. If there is a voltage, then get a noid light set and put them on the injectors and crank the engine over. If the lights flash as the engine is cranking, then the injectors are working and may be plugged. If the noid lights are not lighting up, then the injectors are not working and need replaced. I recommend removing the injectors and putting the tips hanging in a container with sea foam to clean them out. Then put the injectors back on the engine and put the sea foam in the fuel tank. This will stabilize the fuel and clean the fuel out. Fine particles will plug up the fuel injectors and cause them to fail. If you need further assistance with your engine not starting, then seek out a professional, such as one from Your Mechanic, to help you.

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.

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.

Van stalls when it gets warm, i wait a little while 15min to 20min it starts up, until it gets to warm and stalls again.
ANSWER : Check the ignition coil on your engine. If the coil in new with the distributor, then the problem could be the computer or module of the vehicle. An ECM or PCM will cause the ignition system to shut down if there is too much heat. If the vehicle has an external ignition module, then the module could be getting too hot causing the engine to stall out. If you need further assistance with your engine stalling, then seek out a professional, such as one from Your Mechanic, to help you.