Diesel engines are an efficient driving solution that an increasing number of people are turning to in an effort to save money on increasing fuel prices. Unfortunately, they are particularly prone to gelling in very cold weather, a problem that causes the fuel to become sluggish. This problem is often caused by the failure of a block heater. First-time diesel owners may not be aware of this problem and how to fix it.

Gelling Can Be A Major Problem

Many diesel owners are well aware of the problem that gelling causes their engines, but new owners may not be aware of how problematic sub-zero temperatures can be to their engine. When the temperature dips below freezing, diesel fuel begins getting sluggish and thick. It can get so thick that it will plug the fuel filter and prevent an engine from starting.

Thankfully, warming the fuel back up again will allow it to flow freely. Unfortunately this can be difficult in freezing temperatures. That's why most diesel engines come with a block heater that, when plugged in, warms up the engine and keeps the fuel from freezing. But what is happening if the diesel fuel is gelling even when the heater is plugged in overnight?

Could A Malfunctioning Block Heater Be To Blame?

When diesel fuel continues to gel in spite of the use of a block heater, the heater may be malfunctioning. There's a chance that the electrical connections have frayed or that the heating components are worn and unable to operate. This problem is fairly serious because it cannot be repaired by an amateur and requires a diesel repair specialist to manage.

Other problems that could lead to a diesel engine failing to start in very cold weather include a battery that has lost its charge or frozen oil. Keeping these parts of the engine warm can also help prevent failure to start. However if the battery is fully charged and the oil well warmed, gelling fuel caused by a failing block heater is likely to blame.

Signs The Block Heater Is Malfunctioning

Block heater failure is typically fairly easy to spot. It will include an inability to start a diesel engine in very cold weather. A good block heater plugged in all night will keep the engine block warm enough to avoid this problem. Other symptoms of failure include sparks coming from frayed wires and an inability to start the block heater.

Failure of the block heater can be a serious concern. Many fires have been started in diesel engines due to frayed wires sparking and creating a dangerous fire. That's why first-time diesel owners who are suffering from gelling and potential block heater failure needs to take their truck to a diesel repair specialist right away.

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