Landrover have just fitted to my Defender CSW the two extra fuel tanks I bought from Frontrunner, South Africa. One tank (60 litres) is "under-body", and the other (40 litres) fits under the rear fender.
My understanding is that during filling, (diesel) fuel will flow from the outlet in the fender tank, filling the under-body one. Finally, the fender tank fills, giving a total capacity of 175 litres. Later, by means of an electric pump, fuel is sent from the under-body tank to the fender tank, from where it flows - as needed and of its own accord - to the original tank.
The issue is that during fill-up, fuel is not flowing, apparently, to the under-body tank. Yesterday, on fill-up from almost empty (5 to 10 litres left in ??), I got in 121 litres, a slightly odd amount, given that the original tank is 75-litre capacity and the under fender tank 40 litres, as mentioned above.
I wondered if the problem might be due to an air lock in the piping. But wouldn't the breather tube(s) presumably fitted resolve any problem in that regard?
Please, any suggestions?
My understanding is that during filling, (diesel) fuel will flow from the outlet in the fender tank, filling the under-body one. Finally, the fender tank fills, giving a total capacity of 175 litres. Later, by means of an electric pump, fuel is sent from the under-body tank to the fender tank, from where it flows - as needed and of its own accord - to the original tank.
The issue is that during fill-up, fuel is not flowing, apparently, to the under-body tank. Yesterday, on fill-up from almost empty (5 to 10 litres left in ??), I got in 121 litres, a slightly odd amount, given that the original tank is 75-litre capacity and the under fender tank 40 litres, as mentioned above.
I wondered if the problem might be due to an air lock in the piping. But wouldn't the breather tube(s) presumably fitted resolve any problem in that regard?
Please, any suggestions?