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(More) Winter Problems with ULSD
 
Photo Courtesy of Terry Swanger
Which One of
these Filters Would You Rather Have on Your Vehicle?
Welcome to February 5th 2007, the first real
winter weather with the "new" Ultra Low Sulfur Diesel (ULSD). After being told
by refiners and many distributors that ULSD would be the "be all, end all" magic
problem solver for all diesel engines, this is what really happened when it
finally got cold and stayed cold for 48+ hours.
The red colored filter on the left is the result of a
distributor using so much anti-gel additive that it actually saturated the fuel
to the point of completely plugging THOUSANDS of fuel filters over
several days.
The filter on the right shows paraffin wax plugging it.
This customer used ULSD #1 (ULSD Kerosene) to "cut" the ULSD #2 fuel. However
the "new" ULSD #1 doesn't work the same way as the "old" LSD Kerosene (see more
below)
The new ULSD gels 4°F to 5°F sooner than the "old" Low
Sulfur Diesel (LSD). The new ULSD is harder to treat for cold weather than the
"old" LSD. Many additives that you have been using for years no longer work on
the "new" ULSD. The "new" ULSD holds more dissolved water than the "old" LSD,
causing ice formation as the temperature drops below freezing.
When treating with a cold flow improver (anti-gel), using
the recommended treatment ratio provides a certain level of protection, using
twice the recommended ratio may improve the gel point a little, however if you
go beyond that level it will actually raise or worsen the gel-point. At
treatment levels beyond 3-4 times the recommended ratio, you will begin to
saturate the fuel and can actually plug a filter full of anti-gel additive. This
is generally indicated by a reddish or pink colored wax-like substance covering
the filter as much as 1/4" thick. This wax-like substance will not readily melt at
room temperature unlike paraffin wax that melts above 32?F.
In the past the general "Rule of Thumb" regarding using
Kerosene (#1D) to "cut" #2 diesel was that for every 10% kerosene added to #2
diesel you would lower the Cold Filter Plug Point (CFPP) by approximately 5°F.
So for example a 50%-50% blend of #2D and Kerosene would have lowered CFPP by
approximately 25°F. The "new" ULSD #1 is far less aromatic and has much less
solvency than did the old Kerosene. As a result the new ULSD #1 will only lower
CFPP by 2°F-3°F. This means that a 50%-50% blend will only lower CFPP by 10°F to
maybe 15°F.
Both filters were restored to complete functionality in
less than 30 minutes using Enertech Labs Thaw-It Emergency Fuel Treatment.
Using Enertech Labs Complete Fuel Treatment with
straight (untreated) #2 ULSD will prevent problems like this from happening in
the future.
Copyright 2007 ©
Send mail to
sales@enertechlabs.com with
questions or comments about this web site.
Copyright © 2003, 2004, 2005, 2006, 2007, 2008, 2009
Enertech Labs, Inc.
Last modified:
01/12/09
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