Quote:
Originally Posted by John H
The engine will run if only the under bonnet pump is functional assuming there is over a quarter of a tank of fuel, this is because the tank has 2 compartments (Divided in the centre by the floor tunnel) The in tank pump delivers fuel from the drivers side to the passenger side, and the under bonnet pump draws the fuel from a port on the passenger side. Thus less than quarter of a tank lets the fuel stay on the wrong side of the outlet port allowing air into the system.
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It doesn't actually work like that. The reason the system fails with less than a quarter of a tank of fuel onboard is that the top of the ITP is uncovered as the fuel level drops, and if it isn't running, the self bleeding ball valve on the top of the ITP will be open, so air is drawn in and the UBP can't draw any more fuel out of the tank.
If you look at a TD4 Freelander with the same engine it also has an ITP, but it has a flat bottom tank with no saddle.