Originally Posted by Nos4r2
Is the main tank lower than the 25 litre tanks?
Here's what I think happened-assuming the main tank is lower than the 25 litre tanks.
You were drawing from the main tank 'til the fuel slowly syphoned into the main tank from the 25L tank as the valve wasn't open fully.
You then started drawing air into the lines from the empty reserve tank, creating an illusion of being out of fuel.
<edit> just seen the second page. I think you're right.
Im going with this theory, and in a way its reassuring as I was gutted that my fuel efficient engine was costing 260l to cover 82 miles in what was really flat calm conditions, ok yes we were gunning the engine as much as it would go but I still would like to think it was better than that.
SO now it looks like 150l is more realistic.
And yes the 2 external tanks sit on the deck and the internal is buried somewhere under the console with the pickup being at the bottom. I will dig out the build thread that shows the fuel set up