Frequently Asked Questions
Welcome to FAQ’s
At LHT, we understand your business depends on equipment utilization, and know that downtime can be costly. The following are a few questions and answers intended to help you quickly resolve your issues.
What are the common causes of Filter Plugging?
Filters are designed to capture the silicate and rust particles commonly found in fuel. There are several causes of premature filter plugging; •Biomass contamination that is produced by microbial activity in fuel tanks. •Wax precipitation associated with winter temperatures. •Poor quality biofuel contamination •Soaps and salts created in fuel storage and engine conditions. Most OEMs recommend changing fuel filters at the Recommended “A” Preventative Maintenance interval which is typically between 30,000 and 50,000 miles. Using calculations and fuel cleanliness standards, engineers design filters to capture an “expected” volume of particulate and project the expected life of the filter.
What causes injection failures?
As diesel fuel passes through the engines fuel system, it can leave behind deposits on critical components such as fuel pumps and injectors that can lead to malfunction, loss of power, reduced fuel mileage and performance. In more cases it can eventually lead to costly component failures.
What is fuel degredation?
Diesel fuel has a shelf life and can begin to degrade in storage tanks and engines over time. In addition, extreme temperatures and pressures inside a modern diesel engine can cause fuel to degrade. This degradation creates acids and other particulates that can be harmful to critical engine components if left untreated.
What are detergents?
Detergents, also known as surfactants, are specifically designed to lift dirt from surfaces and suspend it in oil or water to be carried away, keeping surfaced clean to operate as intended.
What are signs of microbial contamination?
Microbial contamination can occur when water accumulates in storage or vehicle tanks. Some of the early signs will be premature filter plugging at fuel dispensers and/or black sludge material in dispenser filters.
Water in my tank, is that normal?
Water is present in ULSD fuel in small amounts, less than 250ppm. It is also common to find water at the bottom of storage tanks. Prior to the advent of ULSD it was relatively harmless. However, due to changes in the composition of ULSD and refining processes, water in storage tanks can quickly lead to microbial contamination, corrosion issues and engine damage. It is recommended that fuel storage tanks be kept clean and dry.

LHT Solutions

At LHT, we understand your business depends on equipment utilization and that downtime can be costly. To combat maintenance issues and downtime, we offer custom additive packages specifically formulated to meet the most demanding conditions:

Regular use of LHT's GOLD diesel can help to improve power and fuel economy.  In addition, GOLD is proven to reduce emissions and lower overall  maintenance costs.



Winter temperatures can stop an engine quickly. EC-1 is proven to keep equipment operating in the most demanding of winter conditions. EC-1 is specifically formulated to not only keep fuel liquid at low temperatures, but to control how wax forms to prevent filter plugging. By combining with water control agents with polymers, EC-1 is able to prevent "icing" of filter and fuel lines while preventing the wax from settling to the bottom of the tank over extended periods of downtime to assure quick starts on cold mornings.

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