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Re: Diesel Fuel Question

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Patrick Potter

12-12-2013 17:46:54

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I saw the question about diesel additive, my tractor is not a diesel but my truck is, I'm in Texas sth of Fort Worth and we don't normally have to bad of winters but we've already seen temps down in the teens and we haven't even gotten into our winter yet, do you mind enlightening me on what your talking about or is this something I need to be concerned about, '91 Ford 7.3 IDI non turbo.

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Ed Douglas

12-12-2013 18:05:23

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 Re: Diesel Fuel Question in reply to Patrick Potter, 12-12-2013 17:46:54  
Not at all Pat....the quick story.......when it starts getting cold....and certainly the teens would count....Diesel fuel can coagulate...or gel as it is commonly you saw from the responses...some folks mix kerosene in with the fuel to suppress this.....others use additives.....Now my experience is with Boeing 737s and tractors.....The 73 takes care of the issue by running the fuel through a fluid to fluid heat exchanger.......the hydraulic case return lines are routed thru the fuel tanks......doing two things.......heating the fuel.....cooling the hydraulic fluid....up above 37000....monitoring the tank temp is to Tractors....and maybe some of the smart guys can weigh in on your truck......additives suppress does mixing in kerosene....I have never done he latter....and was asking for input.....a lot of experience on the forum.....I have been told that gas companies put in such additives in the winter months.....hope that helps

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12-12-2013 22:19:53

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 Re: Diesel Fuel Question in reply to Ed Douglas, 12-12-2013 18:05:23  
737"s also use Jet A (freezing point-40C) or Jet A-1 (freezing point -47C).

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Ed Douglas

12-12-2013 22:32:23

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 Re: Diesel Fuel Question in reply to Jerry/MT, 12-12-2013 22:19:53  
Yes Jerry.......that is true.....but then it is cold at altitude!....some times the only way to raise the fuel temp is to fly lower.....I am impressed you know the freezing point of both......bonus question.....Wide cut JP-4......and jP-8....not much of the latter around......and I haven't seen Jet B for quite a spell....

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12-14-2013 05:05:50

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 Re: Diesel Fuel Question in reply to Ed Douglas, 12-12-2013 22:32:23  
Hi Ed,
I waa a propulsion engineer for Boeing, retiring in 1999 as Chief Engineer-Propulsion Research & Prekininary design. As an aeronautical engineer right out of college, I worked on the design of the 737-100 and -200 and I was Propulsion Aerodynamics Manager on the 737 New Generation in 1993-1996. Fuels Systems was part of our Technology Group so I picked up some knowledge about them along the way.

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Ed Douglas

12-14-2013 08:01:44

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 Re: Diesel Fuel Question in reply to Jerry/MT, 12-14-2013 05:05:50  
Jerry that's outstanding....I guess you did! That is really quite impressive......I racked up quite a few hours on a lot of your engineering....I worked the panel on the 727, and flew that briefly as a first......The best airliner ever.....if they were still on property....I'd still be on it.......moved to the 100-200....loved that also....I am an old needle, ball and airspeed kind of a guy. I believe we had the distinction of having the first four 100s from Boeing...though they came from Lufthansa (though it may have been old Continental folklore)....maybe you can confirm.... on to the 300...500......We parked the 300 bout 2 years ago.....last 500... July if memory serves.....the fleet is all next Gen now with the Max on order...I actually divide my time between line flying and Simulator Check Airman......doing so much training right now that we have been using two remote facilities in Miami.....The old Pan Am building and your Alma Mater at is quite a place.....sorry...this got long ......would like to tell you about an issue we are having to address with the ER and get your take on it......drop me a line if you get bored and have a minute!

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