Aux petrol tank for LPG GU Patrol - how many litres?

G day tim
My GU 4.5 was already fitted with gas when i bought it and has a 120lt gas tank and the 30lt approx petrol tank.
Mine takes 88 lts of gas when empty.
As for the first 2 questions cant help you sorry.
Evan

a) NO
b) many after market usally around 80 ltrs
c) D90 tank 115 water capacity 90 ltr usable

pull out one of the 3rd row seats & place the tank in the rear of the car?

Recently converted my 4.5 Patrol.

Replaced the Subtank with a 72l petrol tank , and has a 100l LPG tank.

A couple of guys have gone with an 80l petrol tank.

You can fill a Gas tank to 80% capacity to allow for expansion.

It IS possible to add more , but you would want to be about to use it (trip etc) to allow for any expansion.

The mob that fits the lpg to the diesels puts a 28l useable gas tank opposite the factory sub, after modifying the exhaust. I have often wondered how expensive it would be to get a new exhaust, routed away from the area, and maybe fit another sub tank there. Possibilities of an aftermarket 70 odd litre one for about $700.00, or a std 30 litre one for a lot less(???).

I suppose the 3rd option is a custom tank, There is a fair ammount of room under there if you ripped the lot out (exhaust, petrol tanks etc), and find the biggest tanks that could be fitted into the space you have created.

Cheers Andrew

Gday Tim

Have been through the experience, we have a 2001 GU,and when we bought it iwe converted it to gas, cost was $3000, they replaced the main tank with a 90 litre gas tank which holds approx 86ltrs, and they replace the sub tank with a 80ltr fuel tank. Its easy to use as all you do is push a button to change from gas to petrol, fuel comsumption is pretty high, at around 350km to 86ltrs, which drops dramatically when towing a load, but hey we all know there gonna chew the juice, the compromise you take when having four kids...when on the open road on gas and towing the engine works a little harder trying to keep a constant speed, but for around the town, and not loaded it doesnt work much at all. we run a set of 270/70R16, and a full carry rack, all adding to the load.
It cost around $45 to fill on gas, and the unleaded about $100, Im happy with the conversion, and have had no problems with it since installed about a year ago, if any thing it probably detuned the engine a tad when running on unleaded, but in all has been good value.
Good luck in making the decision

Neil and Lea

Thanks everyone,

Looks like around 80 litres or so replacement petrol tank will be the go!

Tim