The fuel pump feeds fuel to the engine at a reliable rate; without this pump, your fuel would just sit in your tank, useless and inert. The fuel pump is a device that moves fuel from your tank to the engine, supplying the fuel at a constant pressure to ensure that your engine runs smoothly. Depending on the age of your vehicle, you may have either a mechanical or an electronic fuel pump. Mechanical pumps run off of the motion of the engine; a diaphragm mounted to the outside of the fuel tank expands and contracts, creating a low pressure system that forces the fuel out of the tank and into the engine.
Electronic pumps are typically located inside of the fuel tank and use electromagnetic motors to force fuel to the engine at high pressure.
Mechanical pumps are usually found in cars that use carburetors, and electronic pumps are usually used with fuel injection systems.
Since mechanical pumps are driven directly by the motion of the engine and contain few moving parts, they tend to be reliable and relatively easy to diagnose and fix. Most problems with mechanical pumps occur when the diaphragm is damaged in some way, throwing the pressure system off balance. Electronic pumps are typically linked to electronic control systems and contain multiple moving parts; because of this increased complexity, these types of pumps are more prone to failure.
Any one of several different parts can malfunction and lead to fuel pump problems. Although mechanical and electronic pumps fail for different reasons, the symptoms of failure are similar for both types of pumps. This interruption in fuel flow causes your engine to skip several power strokes, forcing the engine to sputter and jerk. In the early stages of failure, this sputtering may only last for a minute or so before the engine returns to normal operation. Some drivers may confuse this sign with the effects of dirty gas, but modern fuel standards make a failing fuel pump more likely.
If you notice that your car often loses power when you try to accelerate from a stop, your fuel pump may be in trouble. Accelerating requires more fuel, forcing your fuel pump to work harder. If your pump is failing, it may not be able to keep up with this increased demand, starving your engine of fuel as it tries to accelerate. Certain driving activities, such as climbing a hill or towing a load, place an extra strain on your engine and demand more fuel to deliver the same performance.
These demanding situations increase the strain on your pump, causing the weak elements to fail. As your fuel pump begins to wear out, its components often wear down at different rates. When this mismatch becomes great enough, the pressure in your fuel lines can become inconsistent. If you ignore all of the other warning signs of a failing fuel pump, it will eventually fail completely.
Once your fuel pump has finally given up the ghost, no fuel will reach your engine. To confirm that your pump has failed, check the pressure in your fuel lines with a fuel pressure gauge; if it reads zero, then your pump is likely dead. Some of the symptoms of a bad pump can also be caused by other mechanical problems, so the repair shop will perform a number of tests to isolate the true cause of the problem.
Using a multimeter, the mechanics will measure the voltage drop on different ends of the fuel pump to determine whether there are any problems within the pump itself. Your fuel pump is an integral part of your car, supplying your engine with a steady supply of the fuel it needs to keep you moving. Like any device, however, fuel pumps can and do eventually wear out after thousands of miles of use.
If your car struggles with weak or inconsistent power, it may be time to replace the fuel pump on your car. Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email. Notify me of new posts by email.
One major factor that is overlooked in this article is relative value. Classic cars, especially notable designs or rare "thoroughbred" automobiles tend to hold their […]. Primary Mobile Navigation.VW TDI Fuel Filter Restriction: Causes, Effects, and Cures
Alex Jefferson. There are no comments Add yours. Latest Posts. Popular Posts. Latest Comments.The symptoms of a clogged fuel filter in a diesel car show up in the way an automobile starts or runs during acceleration.
The fuel filter is a fuel system component through which diesel fuel passes, cleaning debris from the fuel and trapping it inside or by the fuel filter. This filtering of debris builds up in the fuel filter over time, causing the fuel filter to clog. A good sign or symptom the fuel filter is clogged in a diesel car is the car will not start when the ignition is turned. The diesel car acts as though it is out of gas; the diesel engine turns over, but does not start.
The clogged fuel filter is preventing gasoline from flowing into the injectors to enable the diesel engine to fire up. The first thing a diesel car owner must check is the quantity of fuel in the vehicle. If there is plenty of fuel in the gas tank, then the fuel filter is the most likely culprit.
A sure symptom of a clogged fuel filter is the diesel car will start missing out during acceleration. The fuel filter collects small particles of debris which flow through the fuel line. When the fuel filter begins to collect too many particles, the fuel filter does not allow enough diesel fuel to flow into the engine while it is operating. The diesel car begins to jerk and jump during acceleration because the fuel filter is beginning to become clogged.
A diesel engine will begin to idle roughly and act as though the engine is going to stall when the fuel filter is clogged. Once the diesel car is started and allowed to run for a while to warm up the engine, the diesel car owner will notice the engine sounds like it is choking. The engine will event stall and not start up again if the fuel filter is clogged. The engine can even begin to shake while the car is idling because not enough fuel is getting into the fuel injectors.
This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Auto Engine image by Andrew Breeden from Fotolia. Rough Idle A diesel engine will begin to idle roughly and act as though the engine is going to stall when the fuel filter is clogged.
About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.If your car has a fuel pump, you must keep it in good working condition. Read on to learn what can cause problems with your fuel pump and what some of the signs are when yours is failing so you can immediately remedy the issue when it presents itself. Always make sure that your car never runs out of fuel.
This will help in increasing the life of your fuel pump as running it on low fuel causes strain.
Symptoms of a Bad or Failing Fuel Pump
When your vehicle starts making a high-pitched sound, it could be a sign of a bad fuel pump. Different vehicle pumps make different sounds, so there might be high-pitched noises or scraping sounds. If you hear unusual noises of any kind, make sure to have your vehicle checked out.
If your fuel pump is not working properly, the vehicle may not be able to maintain a good fuel pressure. With low pressure, your car might have trouble starting even though the rest of the parts are functioning normally.
If your vehicle suddenly has trouble in accelerating, it might be a symptom that you need to replace your fuel pump. This usually happens when the pump is not supplying an adequate amount of fuel. Many times, the filter of your car might seem to be malfunctioning. Sometimes, your vehicle might have a loss of power, which usually ends up slowing down the car.
Causes and Signs of a Bad Fuel Pump. Written by Purva Bhandari. Reviewed by H. Signs High-Pitched Sound When your vehicle starts making a high-pitched sound, it could be a sign of a bad fuel pump.
Low Fuel Pressure If your fuel pump is not working properly, the vehicle may not be able to maintain a good fuel pressure. Problems Accelerating If your vehicle suddenly has trouble in accelerating, it might be a symptom that you need to replace your fuel pump. Malfunctioning Filter Many times, the filter of your car might seem to be malfunctioning.
Low Power Sometimes, your vehicle might have a loss of power, which usually ends up slowing down the car. Engine Stops Since the fuel feed is obviously not consistent in a car with a poor fuel pump, the engine might come to a halt any time for a moment or two.
Popular Articles. By Charles Gatebi. How to Clean a Diesel Fuel Injector. By Smitha Devadas. How to Install an Aftermarket Diesel Fue By Chris Nickson. By Sage C.Virtually all modern vehicles with internal combustion engines come equipped with fuel pumps. The fuel pump is responsible for delivering fuel from the gas tank to the engine at the appropriate pressure required for performance demands. When the key is turned on, the fuel pump is activated and pressurized, which can be heard as a quiet whine or hum in some cars.
The fuel pumps on most modern vehicles are electric and mounted in the fuel tank. However, some vehicles are equipped with inline or mechanical-style fuel pumps. Because the fuel pump is the component responsible for supplying the engine with the fuel required for it to run, any issues with it can cause major drivability and performance problems.
Usually, a bad or failing fuel pump will produce one or more of the following 8 symptoms that alert the driver of a potential issue. One of the first symptoms of a problem with the fuel pump is a loud whining sound. An old or worn fuel pump may produce a noticeably loud whine or howl while running.
Most fuel pumps will produce a quiet hum during their normal operation, however, an excessively loud whine coming from the fuel tank is usually a sign of a problem. There may not be enough fuel, a damaged pump, or contaminated fuel inside the system. Another symptom commonly associated with a problematic fuel pump is difficulty starting.
Because fuel pumps constantly run whenever the ignition is turned on, they can eventually wear out and weaken over time. A weak fuel pump may still pump fuel, but the vehicle may experience difficulty starting from the lack of pressure. A weakened fuel pump can cause the vehicle to take more cranks to start than normal, and in more serious cases may even cause the vehicle to require multiple turns of the key before it will start.
One of the surest indicators of a faulty fuel pump is a sputtering engine — typically at high speeds. Should you be driving at a consistently high speed and the engine suddenly sputter before returning to normal operation, it may indicate issues within the fuel pump.
In this case, the fuel pump cannot provide a constant stream of fuel to the engine at the ideal pressure. A rising temperature paired with stalling often indicates a problem with the fuel pump motor.
Another indication of a bad fuel pump is a loss of power when the vehicle is under stress — such as driving uphill or carrying a heavy load — or while accelerating. In these circumstances, the car will feel like it is unable to go or maintain the intended amount of power.
If the fuel pump is the cause, it means it can no longer regulate fuel pressure accurately and provide the appropriate amount of fuel to the engine. Irregular resistance inside the fuel pump motor may cause vehicle surging, and indicates a fuel pump in need of repair. Surging feels like the gas pedal has been used.
However, it occurs at a random, consistent speed. If this happens often, it may be because of problems within the fuel pump. A valve within the fuel pump may not be opening, causing more fuel than necessary to pour into the engine system. Excess fuel in the engine does not get stored or used. Another more serious symptom of an issue with the fuel pump is a no-start condition. If the fuel pump fails completely — to the point of not being able to provide enough fuel for the engine to run, the vehicle will refuse to start.
The engine will still crank when the key is turned, but it will be unable to start due to the lack of fuel. A no-start situation can also be caused by a variety of other issues, so having the vehicle properly diagnosed is highly recommended.
Fuel pumps are found on virtually all internal combustion engine-equipped vehicles in one form or another. Most fuel pumps are built to last. However, as the vehicle reaches high mileage, it is not uncommon for fuel pumps to require replacement.The most neglected replacement part of any car is definitely the fuel filter. Every car, diesel or petrol, uses fuel filter to prevent dirty fuel from entering the fuel injection system and clogging it up.
The fuel filter is mostly tucked away under the car or inside the fuel tank. It remains out of sight and we often tend to forget about it. Some regions are known for having bad quality fuel. This leaves the company recommended fuel filter replacement schedule pointless. When the fuel filter clogs up, look out for symptoms of bad fuel filter: Misfires, Stalling, Reduced Acceleration, and Noisy Fuel Pump.
All engines require fuel for them to do anything. If any debris obstructs that flow of fuel, it causes all sorts of problems. High tolerances modern engines are more prone to be affected by fuel pressure variation due to high-pressure fuel injection system and having so many sensors in them. The fuel filter simply traps the debris and prevents it from entering the fuel injection system. The diesel engines are also more prone to have water contamination.
This problem is so evident that many diesel fuel filters also come with a drain valve at the bottom of the housing to release the water. The fuel filter sits inline with the fuel line. There are two types of fuel filter but both uses multiple pleads of filtration paper to clean the fuel.
The only difference lies in the housing:. Cartridge style fuel filter: In this type of filter, the housing of the filter and filter itself can be dissembled. Therefore, only the filter cartridge needs to be replaced. The new filter paper element gets placed inside the same housing. Completely Replaceable fuel filter: This type of filter is just one piece and the entire unit is replaced.
Modern cars mostly use this kind of fuel filter. One would have to take the pump out of the fuel tank to clean the strainer.Fuel filters are a common service component found on virtually all vehicles equipped with internal combustion engines. As is the case with most automotive filters, over time the fuel filter can become excessively dirty — to the point where it can no longer filter out particles efficiently, or even restrict flow.
Usually, a faulty fuel filter will produce any of the following 4 symptoms that can alert the driver of an issue with the vehicle. One of the first symptoms commonly associated with a bad or failing fuel filter is hard starting. A dirty fuel filter may restrict the fuel system flow, or at least make it inconsistent, which can cause the vehicle to experience hard starting.
This is more likely if the filter on the vehicle has never been changed. Other symptoms of a bad fuel filter fall under the category of engine performance issues. Sometimes the fuel filter can become clogged to the point where it negatively affects engine performance. A severely dirty or clogged fuel filter can cause the vehicle to experience several engine problems:. Misfires or Hesitation: Under heavier loads, the clogged fuel filter may cause the engine to randomly hesitate or misfire. This occurs as particles clog the filter and deplete the fuel supply going to the engine.
It tends to be more notable when accelerating. The engine may also shake or stutter at different speeds, as the amount of fuel varies due to the dirty filter. Stalling: If a clogged fuel filter goes unaddressed for too long, it may eventually cause the engine to stall as ideal fuel flow dwindles. Extra stress and heavy loads placed on the engine may instigate the stalling or, if you wait to focus on earlier warning signs, the engine could stall shortly after starting the car.
Decrease in Power and Acceleration: An overall lack of engine powerespecially noticeable when accelerating, can be caused by a dirty fuel filter.
Symptoms of a Clogged Fuel Filter in a Diesel Car
The car may feel sluggish, or even go into limp mode and illuminate the Check Engine light. Fuel filter problems can also cause the Check Engine Light to come on. Some vehicles come equipped with fuel pressure sensors that monitor the pressure of the overall fuel system. A clogged fuel filter may cause low pressure, which will set off the Check Engine Light to alert the driver — if detected by the sensor.
The Check Engine Light can be set off by a wide variety of issues, so having the computer scanned for trouble codes is highly recommended. If you notice damage to your fuel pumpit may be caused by a restricted fuel filter.
The clogged fuel filter puts too much pressure on the fuel pump and prevents the proper amount of fuel in the fuel tank from reaching the engine. Most fuel filters are relatively inexpensive and easy to change. The most popular service booked by readers of this article is Fuel System Inspection. Our certified mobile mechanics make house calls in over 2, U. Fast, free online quotes for your car repair.
Schedule Fuel System Inspection. Service Area. Average rating fromcustomers who received a Fuel System Inspection. Car is Hard to Start One of the first symptoms commonly associated with a bad or failing fuel filter is hard starting.
Engine Performance Problems Other symptoms of a bad fuel filter fall under the category of engine performance issues. A severely dirty or clogged fuel filter can cause the vehicle to experience several engine problems: Misfires or Hesitation: Under heavier loads, the clogged fuel filter may cause the engine to randomly hesitate or misfire.
Damaged Fuel Pump If you notice damage to your fuel pumpit may be caused by a restricted fuel filter.
Signs & Symptoms of a Bad Diesel Fuel Pump
Check Engine Light. Home Articles. The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details.Failed tandem pump can cause oil to mix with fuel. It's in the VW manual, but no one that I have asked so far has been able to substainiate weather or not a failed tandem pump will cause oil and fuel to mix.
Most of the problems were my fault. I know my tandem pump has failed. I have been dealing with it, and so far have not ponyied up the bucks for a new pump. I have been having a seperate issue, which is intermitient white smoke.
I tried almost everything to resolve the white smoke issue and have several posts on here asking for help troubleshooting the smoke issue. One thing I noticed is that an oil change seems to resolve the smoke issue. Yesturday when I drained the oil, I have over 5 quarts in the drain pan. I believe I only put in 4 quarts when I changed the oil a couple of months ago.
In my opinion, I belive fuel is mixing with the oil just like it states in the VW manual. When leaking it is possible for the fuel to mix with the oil, which may cause the engine to fail. Last edited by kpiazzisi; March 20th, at I believe just seals can be replaced on the IIRC, anyway it's certain that fuel in the oil will cause damage to the engine, the PD motor is already hard on cams.
Not to replace or repair the pump seams penny wise, dollar foolish. Gutted PD intake. How can I know my TP is faulty and probably leaking fuel into oil? What symptoms to watch for? To the OP, you got the title backwards. Should read: "Failed internal Tandum pump seals will cause fuel to mix with the crankcase oil. Originally Posted by kpiazzisi. Last edited by Ol'Rattler; March 21st, at Anyway, a failed inner seal on the tandem pump absolutely can introduce diesel into the lube oil.
I just posted this the other day in another thread: "The tandem pump can do this leak fuel into the engine. I read that one person had it happen and when I dissasembled my old tandem pump, I saw how it can happen.
A common shaft through the pump drives both the fuel pump and vacuum pumps driven by the camshaft. The vacuum pump is inboard next to the cylinder head and sucks air in through the big brake booster line port and exhausts the air into a hole in the side of the cylinder head that is drilled through to the oil sump a small amount of lube oil is exhausted with this air too. The oil lubricates the tandem pump from another, small, galley from the cylinder head.
Anyway, the fuel pump chamber sits outboard and there is a simply garter spring seal that seals the shaft between the two pumps. If that seal fails, fuel will be sucked into the vacuum side of the temdem pump and will be exhausted into the cylinder head and it will then run down the head oil return passage and into the oil pan. The Bosch pump is quite nice. As for the white exhaust smoke, I would verify that the valve timing is on check the "torsion value" with a VCDS, should be near to 0.
Last edited by PDJetta; March 21st, at Originally Posted by Henrick. I just ordered the pump.