Second fuel tank problem

The camper i used to have had a 65l main and 90 litre sub. It had an electric fuel pump that transferred fuel from the sub to the main. but the problem you speak of is part of life. I usually try and avoid running a tank out because unlike a 2h a 1hz relys on the fuel for lubrication and it can get expensive running tanks dry

The best way with any diesel unless it is a factory system is to run on the main all the time and use a pump to transfer from the auxilary to the main.
Any air in a 2H (your 60 series) will stop it and require priming and bleeding to get it going again.
1HZ (post 1990) cruiser diesels will self bleed but you WILL stuff the injector pump as it relies on the fuel to lubricate and cool it. Running it dry even when changing tanks as the engine starts to miss will lead to pump failure eventually, the first sign of which is slow to start when hot.
I've use those inline Whale plastic pumps used for water tanks as they are rated for diesel fuel transfer. Just put the pump in the pickup line and tee it into the breather on the main tank filler neck or fit another fitting in the filler neck.

I made my own long range tank to fit under the back of a trayback Maverick ute. I used a Repco electric fuel pump to pump diesel from the LR tank to the main tank in the front. Repco fuel pump was about $55.00 but that was a fair few years ago.

An in-line (suction side) fuel fliter was fitted (one of those small Ryco ones with two nozzles on 'em) and it only blocked once when sucking all the crud from fabrication etc.

If the LR tank is smaller than the main tank, simply use the mian tank until there is sufficient room in the main tank to transfer the LR tnak into the main tank. The Repco pump is a small piston pump and will transfer about 80 litres in 3/4 of an hour. Just keep drving and watch yer fuel guage go up instead of down!!

The pump is reasonably quiet when pumping but rattles like buggery when it runs dry. You'll soon know when the LR tank is empty!

The LR tank came out of an old Valiant Charger (very flat, but large capacity), plus the Repco pump, bit of cable, a switch and some fuel piping. Total cost for an 85 litre tank? - about $100.00.

Piping layout is as mentioned in previous message - simple.

Bilbo

Bilbo, Peter 2 and Davoe. Many thanks everyone for your assistance. Just brilliant!!
I will have a go at making something up to fit. Anyone have any thoughts on the Repco pump versus the Whale pump?

Thanks well55. That is really neat. Has anyone else tried this appoach?