Minnesota Diesel Helpline

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Minnesota Diesel Helpline The Diesel Helpline exists to answer general fuel questions, diagnose and resolve fuel related problems and provide best practices recommendations.

This helpline exists to assist diesel users with diesel and biodiesel-related questions, troubleshoot and diagnose filter plugging problems and provide guidance on proper fuel handling and tank maintenance practices.

Falling leaves and falling temps mean that Minnesota diesel is about to fall back to B5. Here are some tips to help you ...
09/25/2026

Falling leaves and falling temps mean that Minnesota diesel is about to fall back to B5. Here are some tips to help you during this transition taking place on October 1.

Hear the latest update about John Deere's B30 endorsement to use in their equipment.
08/28/2026

Hear the latest update about John Deere's B30 endorsement to use in their equipment.

What happens when farmers run their entire John Deere fleet on B30,...

07/29/2026

These may look like common party staples but don’t dip your chip or take a sip from these containers! The Helpline receives samples in some very creative containers. We understand that sometimes you use whatever is easily available, but it is important to make sure containers are clean and dry before adding your fuel sample. Avoid thin plastics that can degrade or get damaged easily in transport. Preferred containers are new, quart-size, narrow rimmed bottles with tight fitting lids whenever possible. Glass mason jars can also be used if samples will be dropped off in-person and breaking is not a risk. Contact the Helpline to learn more about sample bottles and tips for collecting samples.

06/23/2026

This sample was submitted to the Helpline last week with a request to "test the fuel to determine the cause of filter plugging." There is very little fuel to test in this sample, BUT there are many other problems visible. The Helpline recommends retrieving tank bottom samples in spring and fall to catch and fix potential fuel issues before they become a problem.

The Helpline conducts a test called Thermal Stability (ASTM D6468), which exposes fuel to heat to evaluate its resistanc...
05/29/2026

The Helpline conducts a test called Thermal Stability (ASTM D6468), which exposes fuel to heat to evaluate its resistance to thermal degradation. The fuel sample is filtered and put in a test tube, then heated to 300F for 3 hours. The fuel is cooled and filtered again. The amount of light that can pass through the filter pad is measured, resulting in a “reflectance rating.” A reflectance rating of 70% or higher indicates clean, stable fuel. Lower ratings suggest the fuel has degraded, forming deposits that can clog filters and fuel injectors.

The difference in these samples is dramatic: the fuel on the left measured just 6% reflectance—the worst result the Helpline has ever seen—indicating severely degraded fuel unlikely to perform well in an engine. The sample on the right measured 96%, showing excellent fuel stability.

04/22/2026
Here is a reminder that Minnesota diesel fuel sill transition from B5 to B20 over the next month.
03/30/2026

Here is a reminder that Minnesota diesel fuel sill transition from B5 to B20 over the next month.

Address

Plymouth, MN
55441

Opening Hours

Monday 9am - 4:30pm
Tuesday 9am - 4:30pm
Wednesday 8am - 4:30pm
Thursday 8am - 4:30pm
Friday 8am - 4:30pm

Telephone

+18009293437

Website

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