Outer Limits 4x4 Board

I Have A Friend With A Gu 4.5 Petrol And Is Getting A Lpg System Fitted.
He Has Been Told That The Main Tank Has To Be Removed To Fit In The Lpg Tank.
His Question Is Can The Sub Tank Still Be Used And How Do You Go About The Fuel Pump?
Does Tha Pump In The Main Tank Fit In The Sub Tank Or Do You Just Use The Transfer Pump????????
Another Thing Is He Wants To Fit Dual Batterys At A Later Date And Wanted To Know Where The Second Battery Goes In The 4.5 So That The Installer Doesnt Put Any Gas Stuff There.

Did you intentionally type that with capital letters for each word ?

When i had mine converted they pulled out the main tank, replaced it with the gas tank and the main tank petrol guage now becomes your gas guage. The sub tank still uses its own fuel pump and guage.

Shorty40 wrote:Did you intentionally type that with capital letters for each word ?

Usually they replace the sub tank with a larger after market tank

from memory the sub tank is only 40L on a 4.5 Petty

they replace it with a underbelly tank that hols 75-80L of petty

the duel battery is gunna be hard as there is realy only one place to put the gas setup and thats between overflow tank and left hand side of fire wall , one option is replace battery with 2x smaller agm batteries in the same compartment the big one sits in or put an agm battery in the cargo area (this is what im going to do ).

depending who does the lpg conversion will depend if they change the aux tank from the little 40ltr to the bigger one, mine is still 40 ltr only gets used to start the car on mine anyways

so how do you make the factory sub tank feed fuel to the fuel line? surely you cant use the transfer pump as high preasure pump. anyone done this?

On my old 4.5 they replaced the main tank with the gas tank and used the main gauge for the gas. They put the main tank fuel pump in the sub tank and it worked the same as the main tank did. They put the converter right where the 2nd battery normally goes(green arrow). I never put dual batts in so it didn't bother me.

My "new" 4.5 came with gas fitted and they replaced the 35L sub tank with a 75L one. It has dual batts in the normal position. The gas converter sits under the air cleaner opposite the exhaust manifold (red arrow)

I would tell your mate to put in dual batts first otherwise the gas installer will put it where its easiest for him(right where the dual batts go). Even if he just borrows a battery and battery tray just while the gas is installed!

GREEN ARROW - where they will put your converter which isn't good for dual batt

RED ARROW - where my converter is

yeh he is right, I had dual batteries on my 4.5 before I got it converted to gas, so my converter was placed over the other side of the engine, and yes you can get a bigger sub tank and it will all work fine with out problems

carwrec wrote:yeh he is right, I had dual batteries on my 4.5 before I got it converted to gas, so my converter was placed over the other side of the engine, and yes you can get a bigger sub tank and it will all work fine with out problems

Has anybody worked out a better airbox design for these other than the standard stuppid setup? i have been playing round with a td4.2 gu airbox it will work with minor mods but has anybody else done it??