I have some used atf out of a transfer case. If I were to run it thru a filter, could I then add it to the tank just to get rid of it? Will it harm anything in engine or fuel system?
How much should I run in a tank?
Mercon v if that makes any difference. I also run stanadyne performance formula in every fill up.
Thanx

 

no atf in fuel used to be standard practice in the trucking world,.

 

Tough on the plunger and injectors, as it's not clean, even if filtered.

Low cetane also.

 

When I change my fuel filter I fill the filter with clean ATF. Did this since I had VW diesels. I was told it helps clean the injectors.

 

i love running atf when there are dirty fuel issues.makes the cleaners/cetane boosters look like snake oil.

mercon v says not to be used in transfer cases you know?
http://www.fordparts.com/products/ch...ionfluids.aspx

^ i dunno why.least i can't recall.

 

Old. wives tale.

 

Um, he's not asking if he can run atf in his fuel tanks. He's asking if it's okay to run used atf.

As long as you don't mind the small metal particles in your fuel selector valve, IP, and injectors causing premature wear and damage I say go for it.

 

I find it amusing how some here think these old design motors are so sensitive to the most infinitesimal particulate that may exist in filtered oil or ATF run through the fuel system.

They used to change the engine oil, run it through a pump filter and then run it into the fuel tank(s) in Medium duty and Heavy duty applications. Isn't the 6.9L IDI a medium duty engine? Yes, it is. My stepfather used to be a Ben & Jerry's salesman in the '80s and early '90s. They followed the exact aforementioned used oil filtration to fuel tank system procedure.

I'd wager the new **** diesel is harsher on the fuel injection system as a whole than a minute amount of oil running through the fuel system. I wouldn't fill the tank with oil, just use it sparingly, similar to Diesel Kleen or any other additive.

 

90% of the posts both here and at OB relating to engine problems are people are people burning waste crap in their fuel systems.

 

I've run a couple tanks od wmo mixed 60/40 with diesel, 4 quarts isn't going to instantly kill his truck. With my tow truck I want to set it up to run on wmo, but I'm just going to put my left over injection parts on it.

 

I ran WMO forever in mine without problems, the problems came when i started running straight #1. Suit yourself. Id would and do run: engine oil, hydraulic oil, transmission oil, and the coctail that is our oil catch in the pit. Drain the water, filter, and run, free fuel.

 

Where did you come up with 90%?

Even if significantly less, the owners probably didn't think their cunning plans through very well and used a much too high mixture and/or poor filtration.

If filtered properly and run with a light mix, it won't be an issue, especially if done few and far between. 1/2 quart split between both tanks every fill-up until the waste, filtered ATF is gone? I'm sure that won't puke the motor or wear anything.

 

It came out of my 06 F150. Pretty sure that's what's recommended for that one.

Thanks to all for your input. If I was to run it I would only add a quart, at most, per tank. I would think it would be fine.
I'll see yet what I do.

 

I run 20% waste oil 80% diesel. I wouldnt recommend going over 50/50, but it will run fine in the summer, little smokey, but run fine. 50/50 gives a pretty noticable increase in fuel economy over straight diesel.

 

Think about what you just said and consider this:

You ran WMO and other assorted garbage (with all of its entrained abrasive debris) through your pump. Now your worn out pump, with high plunger and metering valve clearances (caused by the abrasive crap you ran through it) won't run on light, low viscosity !D.

Rocket science is not up your alley.