gu sub tank light stays on

[vorno_18]

i have a gu 2.8td and my sub tank light came on about a month ago and wont go off, i havnt filled the sub tank in ages so does that cause a problem, i went down today and filled it but the light is still on

is it a problem with the switch or something

[michael a]

Add a earth wire to the body and motor. Also disconnect it for a bit to reset memory Prob fixed they only run small earth to the body.

[jav]

Run earth to chassie,

[micka1]

run earth wire from body to chassis . and disconnect battery to reset sub tank module . should fix it .

[Superduki]

anywhere from body to earth or from fuel pump to earth?

[vorno_18]

thanks for the replys will try on the weekend

[manno74]

Pretty sure that this applies to all U's not just my hunka-junk...

The subtank pump (pumps from sub to main, and engine draws only from main) runs for about 15sec everytime you turn your ignition on. They obviously have a dry cut-out, but for the sake of keepng seals lubed, try to keep fuel in sub tank, even if you just pump it over before you fill each time. Cheaper than a rebuild/replace on sub pump.

Go with the earth though - fairly common fault on the sub tank pump...

[micka1]

any where from body to the chassis .
they have a problem when you mount accessories to the car if the body of the car is used as the earth for the accessory . as the body does not have an earth lead it back feeds through the sub tank wiring and to the chassis , in the meantime in knocks out the sub tank and the light comes on .
this is only what i've been told . but since adding the cable it has not happened to the car again .

[gut42]

my sub light came on after nissan programed a new key for me
they just didnt program it back in properly took it back, 10mins later
no light all was good!

[patrol man]

body to chassis earth is a good idea as (THE CHASSIS HAS NO EARTH ), and the tank mounts to the chassis. Fuel pumps are common to failure, and are dear. After market can do the job. There is a way of getting a code out and tracing the fault that way, or it can be reset by disconnecting the battery. cheers Phill

[vorno_18]

i tried running a ground from the pump itself to ground and it worked for about 15 min, but now the light is back on and same troubles

will now try body to chassis and see what happens

[vanbox]

could this be fixed even with a turbo timer? i have that problem since installing my timer

PAUL

[jet-6]

Disconnect your battery for a few mins then put it back on, that allows the sub tank controls to reset.

If you have just installed a turbo timer this will do it if not done right, there is two circuit within the sub tank, if one stays on while the other is off the fault will come up after about 45 seconds

[vanbox]

have done the battery disconnect several times.

the dash light is on > i d/c battery > dash light is off > let car idle down on timer > turn car back on > light comes back on

pump does NOT work at all.

HELP

cheers

PAUL

[jet-6]

Thats easy, you just answered yourself, you have your timer hooked up worng, i know, ive done a few

[vanbox]

i answered myself?????

can u tell me how i would wire it up right???

also have an aftermarket immobilisor.

OH, and the timer will not idle down if the engine has been running for less than 25sec....so if i switch it off before that, and back on, the dash light stays off.

but the pump doesnt work at all.. even if the dash light is off

at what stage does the sub tank decide the main tank is too full and cuts out? as i have only done about 90km's on a full main tank this wk

PAUL

[jet-6]

As i said before, the sub tank runs on two circuits, one is one of the ignitions and it also get spower from a ACC source, you need to make sure you have both of them on the timer or they clash and you get the problem you have.

If you DO NOT fix it you cant use the sub tank

[vanbox]

alright ill give that a go. thankyou for your help

PAUL