Ran Her Empty
Hotshot
Joined: Nov 2013
Posts: 10,107
Likes: 96
From: Hempstead, TX
I don't look under my truck every time I get ready to drive it. However, once a month at the recommended DFCM draining interval, I can glance under my door rather than having to slide under the truck on my back and drain fuel down my arm. To each their own. I have yet to drain a drop of fuel out of either location.
More Turbo
Joined: Feb 2011
Posts: 719
Likes: 17
Fleet Mechanic
Joined: Jun 2009
Posts: 1,346
Likes: 4
From: Connecticut
I read these forums to stay informed, and to learn about this beast because I'm not a mechanical guy... but occasionally I'll run across a thread that really has me thinking. I drove her to Florida from PA in March pulling a 42' fifth wheel. I stopped checking in here a month before because I didn't need the extra worry about stupid stuff that probably would never happen.
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Senior User
Joined: Jan 2012
Posts: 193
Likes: 1
From: Cedar Rapids, IA
Many thanks to Tom and Kper05 for your technical analysis. It's good to know that the truck has a "safe mode" protection strategy to deal with real-life dummies like me!
Carl
Carl
Elder User
Joined: Aug 2007
Posts: 914
Likes: 1
From: Saskatoon, SK, CA
Diesel Fuel Control Module - pump, first filter and water separator all combined in one and frame mounted. No in tank fuel pumps on these, only a pick up. The DFCM draws fuel out of the tank and through the first filter and water separator and pushes it up to the second filter and then on to the HPFP - High Pressure Fuel Pump.
Lead Driver
Joined: Jan 2006
Posts: 6,267
Likes: 5
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Joined: May 2004
Posts: 18,787
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From: Melbourne, Aus
I don't think running dry once will cause any measurable harm to the fuel system. The instant air enters the HPFP system pressure will go down dramatically. These things are designed to pump fuel that doesn't compress nearly as much as air.
Of course shortly after fuel enters the system the engine shuts itself down. I really don't think you hurt anything here, but I wouldn't advocate testing that theory.
Of course shortly after fuel enters the system the engine shuts itself down. I really don't think you hurt anything here, but I wouldn't advocate testing that theory.
Ideally when you go to restart, you cycle the keys a number of times (which the OP did) like you do when you change filters to fill the fuel lines leading to the HPFP with fuel to minimize cranking with no diesel in the HPFP.
Starting these diesels after you have ran out is a hell of a lot easier than the old days of diesels. Technology ain't always a bad thing
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