How Can You Spot The Signs Of A Fuel Issue In Your Diesel Truck?
While there are plenty of similarities between diesel and gasoline engines, the fuel system is one area where these two technologies differ substantially. If you operate a heavy-duty diesel truck, it's important to recognize the signs of a fuel system issue. These problems can reduce your truck's efficiency and power, ultimately costing you money and leaving you stranded.
It can often be hard to separate fuel system issues from other problems with your engine, but there are a few telltale signs you may have a problem with fuel quality or delivery. These three symptoms all point to a likely issue with your truck's fuel system, although it's important always to have a qualified diesel mechanic confirm the diagnosis.
1. Stalling After Start-Up
You've probably learned that all engines need fuel, spark, compression, and oxygen to run. However, diesel engines work a bit differently. Diesel engines use a compression ignition system, which means the cylinder compression is so high that the fuel/air mixture heats up enough to ignite without requiring a spark plug.
As a result, diesel engines typically only need fuel, air, and sufficient compression to start. If your engine fires up, there's a good chance it's receiving enough air and producing enough compression. Stalling shortly after start-up often points to a fuel delivery issue since it typically means there's insufficient fuel available to continue the combustion process.
2. Stumbling and Low Power
Reduced power is another common symptom of a fuel delivery or injection issue. For heavy-duty trucks, you may not notice this problem when operating on relatively flat ground or without a sufficient load. Instead, you may notice your truck struggling to travel up hills or have difficulty reaching cruising speed when hauling a heavy load.
While there are many possible reasons for a loss of power, fuel starvation is one common culprit. If you haven't been keeping up with maintenance, the issue could be due to a clogged fuel filter or dirty injectors, although more serious problems, such as a faulty fuel pump, can also be to blame. Once you notice your truck beginning to lose power, it's a good idea to have a mechanic take a look.
3. Reduced Fuel Economy
Reduced fuel economy is often one of the earliest signs of a problem with your fuel injectors. Leaky injectors may also produce surging, hesitation, or other unusual behaviors when accelerating, and you may notice the smell of diesel in the cab. Leaking injectors will eventually cause more serious problems, including hard starting, stalling, and, in severe cases, oil dilution.
Your truck's fuel economy is one of the best diagnostic tools you have for recognizing problems before they become severe. If you notice your fuel economy taking a significant hit, there's a good chance that something is wrong, even if you don't yet have any stored trouble codes.
Reach out to a diesel mechanic to learn more about diesel repairs.