80series sub tank

[ike]

hey guys... just bought an 80series Blue Marlin Landcruiser
now this might sound stupid and dumb...... but how do you switch to the subtank??????
i press the sub tank button... a lil green light comes on for about 2seconds then turns off? and the gauge on the overhead thingy shows no petrol at all?

faulty sub tank? or am i not doing something right?

[carts]

In the 4500 petrols, when you hit the sub tank button, all it does is start a transfer pump between the sub tank and the main tank. The fuel still gets pumped from the main tank to the motor via an EFI pump.

If there is no fuel in the sub tank when you hit the button, it will illuminate briefly, then the transfer pump will shut down (green light goes off).

The transfer pump will only run if:
a) there is fuel in the sub tank
b) and the main tank is not full (my sub tank wont transfer if i have more than 3/4 left in the main tank)

If you run your main tank down to below a 1/4 of a tank, then hit the sub tank button (providing your sub is full), you will slowly see the level of your sub tank drop, whilst the level in your main tank gets higher. When the sub tank is empty, it automatically switches off.

The diesels on the other hand just change the pickup from one tank to the other when the sub button is pressed.

[ike]

any reason y the gauge on my over head doesnt work? or is that probably just a electrical problem?

[dow50r]

any reason y the gauge on my over head doesnt work? or is that probably just a electrical problem?

Most probably the float in the tank has gone awol, or a bad connection back there, which is quite possible, however...this still should transfer fuel, as the low level switch in the sub tank is what turns off the system, not the gaige, so if it is not transdfering and no fuel on the gauge, chances are it is empty.....did you pull out that black knob next to the filler and fill the subtank???
If you did, you will need to do some fault finding with an electrical manual in hand....(it is in the back of the chassis manual)

[Emo]

Do you actually have fuel in the sub tank? If you can't pump fuel over and the sub tank gauge is on empty, perhaps the tank is empty.

[ike]

its got fuel... when we picked up the car we filled up both tanks... just have to see when it is time to swap over the fuel... must b some electrical problem then?

[sniper]

hmmmm on my diesel cruiser I push a button on the dash and it feeds it from the sub tank to the motor...does not transfer fuel into the main.

[Emo]

hmmmm on my diesel cruiser I push a button on the dash and it feeds it from the sub tank to the motor...does not transfer fuel into the main.

The petrols and diesels have different set ups. Diesels run off the sub tank. Petrol pumps from the sub tank into the main tank.

[sniper]

phew

was starting to think my baby had been abused...by someone other then me

[80alan]

hello,
Dont feel to bad, when I brought my 96 gxl 4500 I had to ask the same question...feel a bit silly asking lol.
Fuel wont transfer to main tank if you have over 2/3 fuel in it. I dont think there is anyway to run off the sub tank first.
Hope this helps.
Alan.

[ike]

thanks guys.... i used up abit more petrol 2day and got it 2 pump over... works sweet. the over head guage stil isnt workn tho.... ill get that chekd out
thanks heeps every1

[RV80]

My sub tank guage would never to the full mark, until i chopped it into a ute and changed the filler setup..