Outer Limits 4x4 Board

gday fellas, is there a fuel warning light for the sub tank
its a gxl 80 series petrol?
the one with the subtank gauge on the roof, with the maplight
and altimetre gauge

thanks
kaine

mine doesnt have one

No they don't have a warning light as they pump the fuel from the sub to the main tank, so a warning light is not nessasary. The pump turns off automatically when the sub is empty.

i know the diesels have a green light in the switch... but nothing in the gauge..

Coighty wrote:No they don't have a warning light as they pump the fuel from the sub to the main tank, so a warning light is not nessasary. The pump turns off automatically when the sub is empty.

Generally, there isn't a pump between the tanks but two fuel solenoids (one for fuel and one for return line). When sub tank is selected, the fuel is coming direct from the sub. This is the case with the 75 and 80 series.

My HDJ-80 have a warning light for main tank .. but never seen a light for the sub tank and I try to get it empy ( ya I'm little cowardy get empy of diesel triying to see warning light in the sub tank )

Petrols will pump the fuel from the sub to the main, meaning you don't need a light as it'll just stop pumping fuel when its finished, but you should still switch the sub fuel button off as I dunno if they will pump dry .

As for diesels, they use the two tanks separately, and I haven't seen a low fuel lamp come on in my car from the sub tank. I have seen it from the main tank as does the petrol 80's. I've only dared to try it once on the sub, no lights came up but I was driving and as soon as it started to cough I switched it over without a drama.

Toy80Diesel wrote:Petrols will pump the fuel from the sub to the main, meaning you don't need a light as it'll just stop pumping fuel when its finished, but you should still switch the sub fuel button off as I dunno if they will pump dry .

As for diesels, they use the two tanks separately, and I haven't seen a low fuel lamp come on in my car from the sub tank. I have seen it from the main tank as does the petrol 80's. I've only dared to try it once on the sub, no lights came up but I was driving and as soon as it started to cough I switched it over without a drama.

In a petrol, the switches turn off automatically, no need to turn them off manually. And as Coighty and Toy80diesel said, they pump from the sub to the main, not seperately like in the diesels.

Another note to remember is that on the petrol 80 series, the transfer pump from reserve to main tank will shut off automatically when the main tank reaches approx 3/4 full. It stops the main tank from overfilling, which is very handy when you have a replacement long range sub tank (mine's 170lt) and a stock 90lt main tank.

No low fuel light for the sub on my 80.

Nope

Toy80Diesel wrote: I was driving and as soon as it started to cough I switched it over without a drama.

Thanks .. nice to know I never have this courage to do that ..

Cheers everyone
in mine i can run the main tank to empty and still have a full sub tank, is this normal or is the 'transfer pump stuffed'
i didnt think the sub tank fed the main tank
the only way i can use the sub tank fuel is by
pressing the subtank button

Tapage wrote:

Toy80Diesel wrote: I was driving and as soon as it started to cough I switched it over without a drama.

Thanks .. nice to know I never have this courage to do that ..

Yeah look I wouldn't recommend it, but thats how my experience went. I just simply wanted to know if there was a low fuel light or it automatically switches over to the main.

Luckily I was on the move rather than stuck at a set of lights. If it had died, I would have had to bleed the fuel lines or maybe just use the pump on the filter to get the fuel through again.

Problem here is there are too many variables...diesel works different to petrol, works dfferent depending on year model and tank size...the answer is NO warning light on sub....not needed in the petrol, definately needed in a diesel if your wife drives it.....

dow50r wrote:Problem here is there are too many variables...diesel works different to petrol, works dfferent depending on year model and tank size...the answer is NO warning light on sub....not needed in the petrol, definately needed in a diesel if your wife drives it.....

need more of a claxton horn warning if your wife drives it. "the car just stopped hunny, and theres a little red light that keeps annoying me, can you fix that too"

Toy80Diesel wrote:

Tapage wrote:

Toy80Diesel wrote: I was driving and as soon as it started to cough I switched it over without a drama.

Thanks .. nice to know I never have this courage to do that ..

Yeah look I wouldn't recommend it, but thats how my experience went. I just simply wanted to know if there was a low fuel light or it automatically switches over to the main.

Luckily I was on the move rather than stuck at a set of lights. If it had died, I would have had to bleed the fuel lines or maybe just use the pump on the filter to get the fuel through again.

I jist wonder about the tank transfer coz the air in the diesel ( in the segs of the swap from tank to tank ) it's verey delicated in my 2H

The 80 series has a com pletely different pump design that can tolerate some air aslong as it is minimal...it just returns to tank after going through the pump...where as the 2h uses all of the diesel and no return so to speak.

dow50r wrote:The 80 series has a com pletely different pump design that can tolerate some air aslong as it is minimal...it just returns to tank after going through the pump...where as the 2h uses all of the diesel and no return so to speak.

Thanks ..

There is a return line on the 2H motors which goes back to the lift pump and not back to the fuel tank like to 80 and later 75 series.
1HZ, 2/3/5L and B series which have the rotary injector pump (bosch VE type) which are self bleeding and can handle a small amount of air.
The 2H and early B-series use inline injector pump (bosch PE type) which do not like air very much and don't self air bleed.

Hope this helps

Sweeney wrote:There is a return line on the 2H motors which goes back to the lift pump and not back to the fuel tank like to 80 and later 75 series.
1HZ, 2/3/5L and B series which have the rotary injector pump (bosch VE type) which are self bleeding and can handle a small amount of air.
The 2H and early B-series use inline injector pump (bosch PE type) which do not like air very much and don't self air bleed.

Hope this helps

This is only injecter leakage....so the pump uses all its given, no return to tank for air to escape...

Toy80Diesel wrote:

Tapage wrote:

Toy80Diesel wrote: I was driving and as soon as it started to cough I switched it over without a drama.

Thanks .. nice to know I never have this courage to do that ..

Yeah look I wouldn't recommend it, but thats how my experience went. I just simply wanted to know if there was a low fuel light or it automatically switches over to the main.

Luckily I was on the move rather than stuck at a set of lights. If it had died, I would have had to bleed the fuel lines or maybe just use the pump on the filter to get the fuel through again.

I have had my sub tank run dry in a 93 diesel gxl and a 96 diesel gxl both times I just selected the main tank and cranked her over. It took longer than normal to start but eventually they did. Just make sure your batteries are up to it. There is definetly no light. On the 96 I got smack on 250km out of the sub tank and that was towing caravan.