This is an article from the February copy of Heavy Duty Trucking. I found it very good reading:


February_HDT_Fuel_Article_Part_II (http://dieselplace.com/forum/uploads/February_HDT_Fuel_Article_Part_II_1.16.04.pdf)

Great read - I'm saving it for future use.


Thanks for posting it.

This is a great sequel to the original document. It's too bad that no one in GM's engineering circle will pay any attention to it. GM tends to ignore independent research unless its their own. http://www.dieselplace.com/forum/smileys/Disapprove.gif

Excellent and informative article!http://www.dieselplace.com/forum/smileys/Clap.gif


The following snip seems to advocate demulsifers (?)
"There are many contaminants commonly found in diesel fuel that can cause problems in your engine. Water is the most common form of contaminant, according to the Filter Manufacturers Council. It gets into the fuel when warm, moisture-laden air condenses on the cold metal walls of fuel storage tanks, or from poor housekeeping practices. Free water settles to the fuel tank bottom, where it can be drained. Emulsified water, however, stays in suspension where it can enter the fuel lines, fuel pump and injectors and cause corrosion and failure of key fuel system components."
http://www.dieselplace.com/forum/smileys/Geek.gif

The emulsifying they are talking about is natural. Not additive induced correct?

The natural would mean no lubricant while water passes the part. Additive would mean incapsulated in additive and fuel with lubricant while passing the part.

They also mention water that can be drained at the bottom of your tank. Our tanks dont have that luxury. So if we run a demulsifyer the water sits and gets mold and fungus in it. Then we hit a bump and it gets sucked through the system.

My truck filters look really clean and rust free with primrose 405.

I have read every single thread and posting on this site and some on other sites, relating to fuel filtering and e & d mulsifying. http://www.dieselplace.com/forum/smileys/Ermm.gif


There does not seem to be a consensus as to which way to go. I have tried both and though only 10K since I bought the truck, cannot see any difference.


So is this art and NOT science?http://www.dieselplace.com/forum/smileys/Throw Up.gif

DP Thanx for the post! Installed Nicktane bracket & filter head today. The 45 gal TF tank goes on Friday and all should be better.


I looked at your December post (after 12,500 miles on CAT filter). I assume that 15,000 is a good number for frequency of change. Also, what frequency are you changing the OEM filter when using CAT?


What tool are you using to cut filter open?

I believe the emulsion they refer to is loose emulsion. IE- take diesel and water, shake it up in a jar, some water will mix with the diesel. let it settle, and some will come out. emlusifiers like primrose tie up the small amount of free water in a lubricating barrier so it can't come out of solution. George Morrison can probably best explain this.


LaBeym - 15k is a good #. Due to warranty issues you should still change your OEM per GM's recommendation. that being said, i don't change mine that often. I use a Tavia filter cutter.

Once the fuel is in your tank it's too late to de-emulsify. Like problemchild implies, what's you plan once you get the water out of suspension? IMHO fuel should be de-emulsified all the way up until it goes in the vehicle. Then you emulsify.

Once the fuel is in your tank it's too late to de-emulsify. Like problemchild implies, what's you plan once you get the water out of suspension? IMHO fuel should be de-emulsified all the way up until it goes in the vehicle. Then you emulsify.

Sounds like a good plan, but I have one question. If they add an additive to de-emulsify the fuel in the storage tanks, what happens to that additive when it goes in your truck? Sure some is going to lock up water and drop out, but surely there will be some left. This leads me to another question, what happens when you have both types of additives in the fuel at once? I assume this all depends on the additive/water reaction kinetics to favor one mode or another.

Who's this Morrison guy, some blowhard who proved he can pass a 150 question essay test???http://www.dieselplace.com/forum/smileys/Wink.gif