Truck loses power with about a quarter tank of fuel left on

Truck loses power while hauling when there's a quarter tank of fuel left

My car has 96500 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there:

In most cases a truck less than two years old shouldn’t have problems with fuel pressure (which is what appears to be the reason why you’re 2014 Ram is stalling out when the tank is down to 1/4). Typically, this is caused by an electrical relay issue or that there might be some debris clogged inside the fuel pump that makes the pressure reduce as the tank volume decreases. You might want to contact the dealership to see if this is a warranty issue or if there is a service bulletin about this issue first. If they can’t help, please feel free to contact one of our mobile mechanics to complete an engine starts then shuts off inspection.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The fuel sending unit is not accurate and is empty at 1/4 of a tank, or you have a fuel pump that has a faulty bottom screen which has come off and sucks air below a 1/4 tank. A big problem that these vehicles have is the plastic fuel tank.
The most likely issue is that a component is clogged. A clogged fuel filter is the most common reason, although a loss of power in your car could also indicate problems with the fuel pump or fuel line. Impurities or debris may be blocking the system, which causes the loss of power in a car.
It can also be fuel-starved, and this condition happens when you have too much air in the engine and not enough gasoline. As you can imagine, clogged fuel injectors, leaking fuel lines, or problems with the fuel pump (more on that below) can cause fuel starvation and make your engine cut out.
Dead Engine

If the fuel pump gets clogged or dies, it cannot transfer gas to the engine. When this happens, you won`t be able to start your car, truck, or SUV at all. The problem could also be clogged fuel lines.

Generally speaking, you should never let your fuel tank fall below 1/4 tank of gas. Letting fuel levels fall below that level increase chance of breakdown. Plus, it`s bad for your fuel pump.
The line lowest to the bottom would mean you have 1/4 of a tank of gas and you should probably fill up soon, below 1/4 would be close to 1/8 of a tank which means get gas now.
Clogged car air filter

If you have a dirty or clogged air filter, not enough air is getting into the engine for optimal combustion, and there will be a lack of power when you are trying to accelerate, especially on Diesel vehicles.

Check the battery on the vehicle and see if it is holding a charge. If the battery have a charge, then check the battery for a load. If the battery cannot hold a load, then the battery needs replaced. Check for any loose ground wiring from the cab to the chassis frame and see if they are corroded, damaged, or loose.
A lean running condition may manifest in driveability symptoms that have not (or not yet) triggered a DTC. Customer complaints may include symptoms such as decreased fuel economy, lack of power, hesitation on acceleration, backfiring through the intake, overheating, weird smells or other problems.
If you do run out of gas, your engine will sputter and stall as it gets starved of fuel. In this case, your catalytic converter, which is part of your vehicle`s exhaust system, can get damaged and you may need to repair or replace it.
As a general rule, it`s best to avoid letting your vehicle run low on gas. Car care experts recommend not letting your fuel level drop below ¼ tank. There are a few reasons for this: It could leave you stranded.
Under the Customs Act 1960, Singapore-registered vehicles are required to have a minimum amount of motor fuel (at least three-quarters of the tank) when leaving Singapore via the land checkpoints. This is commonly referred to as the “three-quarter tank rule”.
Too much oxygen may be present in the exhaust gas due to things like an exhaust leak, a vacuum leak, a faulty mass air flow sensor (causing a lean fuel condition) or faulty fuel injectors.
If the fuel pressure is at or below the minimum spec it can cause this problem. When the engine is started cold the demand for fuel is at the greatest. If the fuel pump isn`t capable of delivering the proper pressure and volume of fuel to the cold engine, the engine will run rough and lack power.
A bad fuel injector or dirty/old fuel filter can drastically affect the flow of fuel into the engine. A fuel system problem is one of the most common causes of poor gas mileage. The more you run your A/C, the lower gas mileage you will get.
A bad fuel injector or dirty/old fuel filter can drastically affect the flow of fuel into the engine. A fuel system problem is one of the most common causes of poor gas mileage. The more you run your A/C, the lower gas mileage you will get.
One of the most common reasons for a fuel tank not filling up is because of a clogged EVAP system. Due to ill-maintenance of the car, debris and dirt can build up in the compartments or hoses of an EVAP system. Therefore, the EVAP gets clogged, unable to trap further fuel vapours.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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.

1996 F150 4.9 5 speed. Frt. Fuel pump quit working. Put fuel in rear tank and it sucked the fuel to the frt tank.
ANSWER : The two tanks are designed to work together and so BOTH pumps must be functioning and, as well, the related fuel system supply code, the Code P0232 that has set has to be resolved. P0232 means that the fuel pump relay is stuck on, keeping power supplied to the fuel pump even after the ignition has been turned off although another possibility is the fuel pump secondary power circuit has a short to battery voltage. The factory service manual (FSM) specifies a very lengthy diagnostic (because you have separate tanks). If you do not have the FSM, your best bet is to request a fuel pump diagnostic – dual tanks and let a certified mechanic get to the bottom of this. With regard to the other code, P0704, that code will set if the clutch switch is defective, there is worn clutch pedal lever or clutch lever bushing, shorted or open wiring and/or connectors in the clutch switch circuit, a blown fuse or burnt fusible link and/or, rarely, a faulty PCM or programming error. If you request the pump diagnostic the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Truck loses power with about a quarter tank of fuel left on
ANSWER : Hi there:

In most cases a truck less than two years old shouldn’t have problems with fuel pressure (which is what appears to be the reason why you’re 2014 Ram is stalling out when the tank is down to 1/4). Typically, this is caused by an electrical relay issue or that there might be some debris clogged inside the fuel pump that makes the pressure reduce as the tank volume decreases. You might want to contact the dealership to see if this is a warranty issue or if there is a service bulletin about this issue first. If they can’t help, please feel free to contact one of our mobile mechanics to complete an engine starts then shuts off inspection.

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.

changed the fuel pump on 1999 dodge ram 2500 diesel fuel truck. Now, it doesn’t send power to fuel pump.
ANSWER : At key on, the fuel pump is normally only powered momentarily to pressurize the system. If you are testing during this brief interval, you have to apply a volt meter at the instant the key is turned on. Otherwise, the circuit will be normally open until the vehicle actually starts. If you are detecting momentary power during that window, then your no start condition is "probably" not related to a fault in the pump circuit.

If you detect no power at ANY time to the pump (including during key on), your only recourse is the Factory Service Manual wiring diagram. With the diagram in hand, you have to trace the fuel pump circuit from the power source to find the interruption. There may be a fusible link in the circuit; also check the pump ground. Obviously check the wiring harness and plug connections as those were handled during the repair. You can probe the new motor terminals to see if they are open. If the motor is good, you should find a small winding resistance of maybe 3 ohms or so (varies from pump model to pump model).

If you desire a mobile repair for this, simply request an electrical diagnostic and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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.

Truck loses power and tries to stall
ANSWER : Hey there. This is a common sign of a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeated as the copper beneath them expands and contracts at a higher coefficient than the insulation.

The insulation develops micro fractures that open when heated and close when cooled. When open, they allow shorting of coil windings and decrease or eliminate the coil’s ability to function. This type of temperature cycling happens because every time you shut the engine off, the fan stops running, the coolant stops flowing and the temperature under the hood rises. Every time you start the engine again the coolant flows, the fans turn on, and the temperature drops. The areas in and around the tops of the combustion chambers, the exhaust manifolds, and the exhaust components are hundreds of degrees hotter than the outside temperature under the hood. When this heat dissipates and is absorbed under the hood, it is trapped causing this cycling effect.

Components that contain heat sensitive materials include parts like coils, injectors, igniters, and some sensors. Any of these may be potentially subject to this same kind of heat problem which can be very difficult to trace. I would recommend having an expert from YourMechanic come to your location to take a look at your truck to properly diagnose the loss of power.

Fuel tank is so rusty, can a sheet metal shop fabricate a fuel tank made of stainless steel and will it not rust?
ANSWER : Hello. I do not think you will find a shop to make a fuel tank for the vehicle since the tank is very custom to fit only your vehicle. You should purchase a new one and try not to always run your fuel tank near empty. The fuel in a tank will keep the rust from forming. When you run low on fuel all the time, the top part of the tank will start getting rusted and will spread all over the tank. Also stay away from fuel stations that just got their tanks filled by the tanker. You will get excess water if you do.