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Old 06-07-2014, 06:18 PM   #1
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Diesel Fuel Causing Filter Clogging

A friend said his diesel engine recently stopped because today's diesel gasoline clogs the fuel filter. He now adds one pint of transmission fluid with every diesel fill-up. Has anyone heard of this being necessary? Our pusher has an '06 Cat engine.
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Old 06-07-2014, 06:29 PM   #2
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I would never add transmission fluid to my fuel system.
Transmission Fluid is designed to increase friction not anything I want
happening to the fuel pump or injectors on a engine.
Not to mention the extra ash it causes when burned.
Also not good at all for the newer exhaust systems.
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Old 06-07-2014, 06:36 PM   #3
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Was used years ago on mechanical injection systems. Do not on electronic of today.
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Old 06-07-2014, 07:01 PM   #4
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Your friend probably got "Bad" fuel.

Fred
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Old 06-07-2014, 07:11 PM   #5
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The sludge that can cause filter clogs is commonly called algae. It's really not, usually a combination of tar, wax, and other solids that form in fuel as it ages. It can also form using summer fuel in winter or sitting with partially filled tanks that have lots of humidity. If his fuel keeps clogging his filters, he might have to have tank drained, fuel filtered and treated, and returned. There are additives to kill off the 'algae' and break down the solids in the tank.
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Old 06-07-2014, 08:05 PM   #6
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Your friend probably got "Bad" fuel.

Fred

Or maybe Bio diesel which caused filter problems.
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Old 06-08-2014, 02:25 PM   #7
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Not he fuel that's causing the clogged filters but like mentioned, some type of contamination in his fuel system.
It had been a long standing industry practice to add uncontaminated waste oil with fuel to dispose of the oil after a service in farm equipment and on road trucks. Transmission fluid has properties that are very beneficial to long life of mechanical fuel systems and electronic fuel injectors. However, it does not play well with the new DEF exhaust systems if over used.
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Old 06-08-2014, 02:41 PM   #8
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Thanks all. Yes, my friend did have to have his fuel tank drained, cleaned and the gas treated. I will NOT be using transmission oil, thanks to your input. But I will be aware of an additive for the "algae" in the future.
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Old 06-08-2014, 06:06 PM   #9
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Our motor home was jerking up hill and atc would blink when it jerked. We stopped and had the fuel filter changed. It help for 3hours, then it came back intermittently . The next day it went thru the mts in Montana for 6hours with no problem. Today coming from couer d Alene to Spokane it was again jerking on inclines and atc was again blinking on, letting off the gas helped. This is always intermittent. Running at 60/65 mph

We have a 2002 beaver 330cummings. Any ideas would be appreciated. Dave
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Old 06-08-2014, 06:22 PM   #10
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A lot of stations and truck stops are selling B20 biodiesel these days. Addition of a biodiesel blend into an older engine can cause clogging as the biodiesel acts as a solvent to built-up deposits in the tank and fuel system. It's normally advised to make the next few fuel filter changes at a shorter interval after biodiesel is introduced.
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Old 06-08-2014, 09:10 PM   #11
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Quote:
Originally Posted by Indianscoop View Post
A friend said his diesel engine recently stopped because today's diesel gasoline clogs the fuel filter. He now adds one pint of transmission fluid with every diesel fill-up. Has anyone heard of this being necessary? Our pusher has an '06 Cat engine.
How new is the coach to your friend? As mentioned above, biodiesel will clog if not used withing a few weeks and bad fuel can be had from the older stations. In either case, as fuel system cleaning is the best solution.

I use about 1 oz/gal 2 cycle motor oil in my tank. I have read the "experts" on this practice and, though not considered the best additive, it is acceptable as an economical solution to top end wear. This coach I now have uses DEF so I am still open to debate about this practice in this particular type of system.

Any fuel, gasoline or diesel that sits for long periods of time without some sort of stabilizer will become contaminated. I worked around diesel generators for a few years in my past life. The phone company always used treated fuel. I was able to start generators that sat for a year or more, neglected in the back 40, after replacing the battery.

Rick Y
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Old 06-08-2014, 09:26 PM   #12
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Originally Posted by Dave austin View Post
Our motor home was jerking up hill and atc would blink when it jerked. We stopped and had the fuel filter changed. It help for 3hours, then it came back intermittently . The next day it went thru the mts in Montana for 6hours with no problem. Today coming from couer d Alene to Spokane it was again jerking on inclines and atc was again blinking on, letting off the gas helped. This is always intermittent. Running at 60/65 mph

We have a 2002 beaver 330cummings. Any ideas would be appreciated. Dave
Welcome to iRV2 ; Dave, sounds like you need to cut open a filter and examine the material for the presence of algae; shows up black on the filter paper. Look for a diesel fuel additive with algaecide. It may be necessary to have your tank drained and the fuel scrubbed.
When you had the filter changed , did you have the ECM scanned for codes?
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Old 06-09-2014, 07:10 AM   #13
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Had a similar problem4 years ago changed filters and have been using Howes diesel fuel conditioner ever since,no problems since costs about $17-20 a jug and lasts for about 4 fill ups
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Old 06-10-2014, 05:42 PM   #14
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Had a similar problem4 years ago changed filters and have been using Howes diesel fuel conditioner ever since,no problems since costs about $17-20 a jug and lasts for about 4 fill ups
Have heard many good reports on this product. Many trucker swear by it.
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