Question about 1993 Toyota Land Cruiser

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Sub Fuel Tank

Hi! I have a problem with my sub fuel tank? It is an 80 series 1993 l/c wagon. The words FUEL TANK are alight on the dash. Have taken it to an auot lecky & to a toyota dealer. Auto lecky could'nt do anything and toyota said it was the sub fuel tank sender unit. We got our hand on a tested 2nd hand sender unit & replaced it, but still didn't fix my problem. Have attached a battery to the pump & it works, solidnoids are working. It just wont pump fuel from sub tank to main tank. Anyone got any ideas. Currently checking wiring but no luck so far!!!!

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  • Anonymous Mar 04, 2009

    hi, i have the same problem with my 92 80 series 1FZFE petrol. sub tank light stay's on dash. so far i have pulled the sub switch apart & found nothing worn there & have checked for voltage & open circuit, everything there seems to be ok. i've bridged the pump & slenoid out from the connection at sub fuel ecu & the pump runs ok. i've changed over ecu's & still the same problem exists. i've removed the sub tank sender & done meter checks on fuel level switch & sender unit everything seems ok there. it appears that the sub tank switch operates on resistance as the green light has voltage to it all the time supplied from ign & ecu & upon turning the ign on & operating the sub switch the pump runs for about 4 seconds with the green light on and then stops. i'm going to check the pump out again it maybe drawing to much current & changeing voltage values at the ecu.

  • Anonymous Apr 12, 2009

    Hi, i have an 80 series 91 model 4.2 desiel with a full sub tank that i can not empty.

    It just wont pump across, sub tank switch is fine, grenn light is on, have checked all wireing which is fine, any ideas in to what could be making it do this?????

  • yadayada
    yadayada May 11, 2010

    what is a SUB fuel tank? is this for a submarine??

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4 Suggested Answers

Mishdaman
  • 11 Answers

SOURCE: Sub Fuel Tank

Very Hard!!!! There are no specs on this, the only way out is to go to your nearest dealer and look at a sender unit and measure its resistance and compare the 2 sender units resistance. It should be measured in Kilo holms, the way to measure it is read the resistance when the floats at its 'lowest' point, and the resistance sould either increase or decrease when you move the float 'up', this depends on what resistance the fuelguage requires, to test if the fuel guage works,'take the positive cable that plugs into the sender unit, fuse it with a low ampeage fuse and connect it to body/chassis while key 'on' and check fuel guage, it must go to full position, there could be another problem, check cables for opencircuits, and check earth(-)connection to the sender unit, plse post to me for further assistance Mishdaman.....

Posted on May 25, 2008

Boole5555
  • 160 Answers

SOURCE: broken sub tank switch in 80 series toyota landcruiser

Replace it. Most switches are mounted to plastic snap clips than can be removed with a simple Flathead screwdriver.A $5 plastic pry tool set is the best, but a butter knife or two works wonders sometimes.

Posted on Jan 05, 2010

  • 1 Answer

SOURCE: Toyota Land Cruiser fuel tank warning light on

Hi There. Have the exact same problem on my 95mod petrol with the sub fuel tank not emptying. think it may be the relay but cant find it. The earlier models have the relay in the rear wheel well, but ours are set up differently. had the whole car to pieces but still cant find it. Was wondering if you had any luck with yours and could enlighten me. Thanks kim_mck53@hotmail.com

Posted on Jan 25, 2010

  • 2 Answers

SOURCE: The fuel tank warning light is illuminated on my 95mod 80 series

A friend of mine had the same problem and found a relay on top of the reserve tank that was filthy and gummed up. We gave it a clean etc refitted it and he hasn't had a problem since. I hope this helps.

Cooky

Posted on May 07, 2010

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