Diesel Vehicle Fuel Filter: How Can I Tell If It’s Clogged?

Did you know that the increasing popularity of electric vehicles has shrunk the diesel vehicle category significantly? Auto manufacturers still produce diesels, but the numbers decrease yearly due to environmental and cost-related concerns. If you own or drive a diesel car, be sure to perform all factory-recommended maintenance tasks to keep it in great condition. A very common issue with diesel vehicles is a clogged fuel filter, which can present a rough idle, white smoke exhaust, and other signs. Let’s review why this happens, how to recognize the signs, and what to do to fix the issue.

How A Diesel Fuel Filter Works

The fuel filter is a crucial part of the fuel system in diesel vehicles. Some diesel-powered vehicles have two distinct filters: one in the fuel tank and another one under the hood. They remove water droplets and catch tiny particulates that pose problems for modern vehicles equipped with high-pressure setups. They continuously gather and hold contaminants. A clogged filter will restrict fuel flow and cause engine problems without regular maintenance.

Clogged Fuel Filter Symptoms

The following symptoms are commonly caused by a clogged fuel filter, but not exclusively. Filters are usually inexpensive, fairly simple to replace, and part of routine diesel engine maintenance. Therefore, checking your filter is a good place to start when dealing with these issues.

Check Engine Light

The check engine light may illuminate when the fuel pressure sensors that monitor the fuel system detect low pressure. Have your service technician read the computer trouble code to verify why your diesel vehicle’s warning light is on.

Difficult To Start

A clogged fuel filter can make a diesel engine difficult to start. Diesel vehicles require adequate fuel pressure in the engine to create combustion. Dirty filters limit the fuel flowing into the engine, and it becomes more pronounced when temperatures are colder.

Faulty Fuel Pump

The fuel pump moves diesel fuel from the holding tank through the fuel system. First, it sends fuel through the filter, then to the injection system, and finally to the engine for combustion. A dirty filter may cause damage to your vehicle’s fuel pump. A clogged filter puts more pressure on the pump. Too much pressure prevents the fuel in the tank from reaching the engine for combustion. If you ignore routine maintenance, a clogged fuel filter can wear out your diesel vehicle’s fuel pump prematurely.

Poor Engine Performance

A clogged fuel filter can cause a sudden decrease in your diesel vehicle’s efficiency. The engine cannot create power when the supply of clean fuel is inadequate.

Rough Idle, Misfires, Stalling

A dirty fuel filter can cause a rough idle, engine misfires, and stalling. A clogged filter restricts the fuel flow to the engine, resulting in improper combustion. If your diesel vehicle experiences power surges, lurching, or stuttering, schedule a diagnostic service right away.

White Smoke

Your vehicle may produce white smoke if diesel fuel contains water or other contaminants. You (or your service technician) can test the fuel by removing the fuel filter and emptying its contents into a clear container. Wait a few minutes and see if water rises to the top and solid particulates sink to the bottom. If the fuel shows signs of contamination, consult a professional for the best course of action.

Diesel Vehicle Fuel Filter: Service Intervals

Diesel fuel is usually thicker and less refined than gasoline, so fuel filters require replacement every 10,000 to 25,000 miles. However, some newer diesel vehicles can specify changes at the 40,000 – 60,000 mile range. Remember, your vehicle age and type, driving style, and fuel quality can impact service intervals. Read your owner’s manual for your factory-recommended maintenance suggestions and adjust if necessary.

Diesel Vehicle Maintenance

Regular maintenance of your diesel vehicle’s fuel filter ensures efficient engine performance and longevity. Bring your diesel to Wentworth Automotive in the Kearney Mesa Area of San Diego. Our ASE-certified technicians will determine if a clogged Ffilter is causing the white smoke and rough idle on your diesel vehicle quickly and at a reasonable price.

Schedule Diesel Vehicle Service

Contact us today at (858) 541-1044 or online to schedule a diesel vehicle appointment.