Running on MT

Wouldn't it be better to plan better and run on the top 3/4 of your tank.

I'm not a mechanic and my information may not be that accurate. Having said that I don't think running a fuel tank dry is a good idea. My understanding is that a number of vehicles have their fuel pump located at the bottom of the tank and use fuel as a cooling medium for the pump. Running it dry or near dry doesn't leave an adequate amount of fuel surrounding the pump to cool it.

You indicated that " The tank is designed with a special sump in it that allows 100% of the fuel to be drawn from the tank." Maybe this design feature alleviates the fuel pump cooling concern. I don't know.

Also dirt, etc. in a fuel tank tends to settle at the bottom of a fuel tank...stuff you don't want in your fuel lines and further.

Also, were you on a level road? The fuel gauges may have been designed to fudge through the angles that Ford engineers assumed were normal driving angles for that truck. You may have actually lost fuel suction if you were driving up or down hill much sooner than was the case in your instance.

gbopp wrote:

4x4ord wrote:
I maybe could have gone another 30 miles?

There's only one way to find out. Carry a full 5 gallon fuel can and run your truck dry. :C

That is one way to find out. Anther way is to disconnect the hose at the fuel filter and measure how much fuel you can pump into a container after driving 30 miles past empty. Because the truck has such a small tank it would be nice to be able to use its entire capacity.

4x4ord wrote:
I maybe could have gone another 30 miles?

There's only one way to find out. Carry a full 5 gallon fuel can and run your truck dry. :C

TakingThe5th wrote:
... but how much of that 6.4 liters will actually be delivered if you need it?

Last night I ended not being able to get fuel. I reset the trip odometer at the point where the mileage counter reached zero. I drove 30 miles home at which point the trip recorder said I'd used 6.4 liters. I had the fuel tank off my 2011 f350 which is identical to the '16. The tank is designed with a special sump in it that allows 100% of the fuel to be drawn from the tank.

I filled up when I got home which took 92.5 liters. The tank capacity is supposed to be 26 gallons or 98.5 liters. I maybe could have gone another 30 miles?

... but how much of that 6.4 liters will actually be delivered if you need it? It depends on the position of the fuel pick up. And will it start sucking in some air with the fuel? If so, how receptive will your injectors be to that situation? What you are asking is good information but I don’t think I would actually expect to use that fuel - too risky. Might be better to just park it and start walking while you think about the larger fuel tank you need to buy.