Dual Fuel (LPG/Petrol) TB45 GU98 going back to original configuration

[Anaurath]

Hi There,

finally I´m completely decided to remove my LPG installation and go back to the original configuration.

I found 2 second hand long range tanks so what I would like to do is:

1.- Remove the LPG system and install the main long range tank (150l).
2.- Change the standard aux tank for the long range one (90l).

Anyone of you have any experience or could advice about issues I can found when starting the conversion back.

In addition to the tanks, I have also all the required bits and pieces (sender/pump for the main tank, sender for the aux tank, all electrical ooms required as well as all vents to connect the aux tank to the main tank and dump pipes to fill in both tanks).

I am mainly concerned about:

1.- Properly remove the full LPG installation (and steps to bear in mind to do it safely).
2.- How to properly reconnect the Aux tank to pump the fuel to the main tank when required. I presume that actually with the dual fuel system the original pump used for the aux tank to send the fuel into the main one (the one sitting inside the dash), is now used to pump the fuel from the aux tank to the engine (when the switch is on the petrol position).
3.- Someone knows if the LPG installers usually leave the original connections hidden somewhere or just cut them and put new electrical wires???

Anyone who can shed some light about the whole process and points above would be highly appreciated, even all guesses would be highly appreciated too.

Cheers,

[Bloodyaussie]

I am also doing this and just go off the phone with Patrolapart and they have everything I need to do the conversion back to petrol running 2 tanks.

Just need to make my own wiring.

They are holding all the parts for me until I get there..

Gas sucks balls at $1.05 a litre on 2 of my last trips.

[04OFF]

Have you thought about placing a swap advertisement, to try and exchange parts with another TB45 owner that is "wanting" to fit LPG ?

[threedogs]

Make sure no one is smoking around you when you turn the gas off at the tank and disconnect the fittings.
Place a jack under the tank and un do the brackets holding tank, some gas installer weld to the chassis others through the floor.
As 4off says some here may want a gas system , but more trouble than they are worth if you ask me.
gas generates some incredible temps. Better off with out it, you cant tour as prices are so high, so an aux long range tank is a better option
When I had my gas 4x4 it was 18cents a ltr. great then but now its too high to be viable IMO

[04OFF]

As 4off says some here may want a gas system , but more trouble than they are worth if you ask me.


Agree, i think nearly all the TB45 owners that have engine trouble, have LPG.


All the places i really like to go (QLD sand islands) don't have LPG for cars, so very easy decision for me :animierte-smilies-f

[Anaurath]

Thanks Guys for your first comments and suggestions. At this point I completely agree with you. I use to go down the CBD using a Nissan Micra. The Patrol is just reserved for the big trips.
To me it makes no sense going around Perth and surroundings using the "big girl". However is the only place where you can find decent prices for LPG... as soon as you start to leave the city behind the prices for LPG start to rise importantly. When travelling from Adelaide to Perth, I found in a roadhouse (I would say once crossed the WA customs, near Cocklebiddy) LPG was more expensive than petrol 2.03 vs 1.98..., furthermore if you want to visit the Outback the chances of finding LPG are limited and in my case the consumption of LPG is about 22l to 24l per 100km whilst using petrol the consumption is about 16l to 18l..., so having 150l + 90l makes possible with the help of some jerry can to fill in where fuel is gonna be cheaper if well planed.

Anyway, if someone could provide some detailed explanation about how the auxiliary tank is configured in a dual fuel system, especially how is provided the petrol to the engine, then would be great to figure out how to go back. As I suggested in my initial thread I presume that the aux tank pump (the one that originally transfers the petrol to the main tank), to me is used to provide the fuel to the engine, so I would bet that the switch that alternates from gas to petrol, somehow is connected to that pump, being the main reason why the "subtank" button remains inactive in my LPG system. If anyone could provide some more technical info confirming what I´m saying that would be awesome

The other thing I´m wondering is what usually do the guys fitting the LPG systems. Do they cut the wires and connectors that goes to the fuel sender/pump unit of the main original tank? or perhaps they leave the connectors there to be reused and just stripe the cables to connect the new sender/pump of the LPG gas tank?

I know that probably the best way to discover it is just jacking the car and starting to dismount, but any previous comment would be very welcomed.

Cheers,

[lhurley]

I would imagine that each person doing the install would do it slightly different ways. Eg some might cut wires, some might just splice, where as others might put in plugs so it's essentially plug and play. Same with the pump, could be original sub tank pump, could be from out of the main. Could even be an entirely different pump all together.

Edit: the pump in the aux is just a transfer pump as far as I know. So the pump in the tank would of been changed. To what I don't know.

[GQ TANK]

Some installers use a relay to switch the volts on / off to the injector rail. When on lpg the relay disconnects the injector rail volts.

Use the tank valve to turn the lpg off - ther will be a little lpg in line.


The lpg filler hose's are one way - just disconnect the hose at the tank

[slamnsam]

in the ones i have replaced for people the pumps have been eithier vr-vs commodore ones or ef-el falcon ones. cheers

[threedogs]

The gas installer near me uses Araldite on all the electrical
connections to stop them coming loose and sparking,
but you wont need to worry about that.
Good thing is your shedding a few kg from your Patrol

[Anaurath]

Thanks Guys for your comments and suggestions!!

Probably I will dismount the Aux tank first without disconnecting anything, just to investigate and try to figure out how this part of the installation has been solved.

I´ll keep you updated about it.

Cheers,