Hello,

I've got an 1988 4Runner SR5 and I noticed this morning that the low fuel light came on with the gauge reading 3/4 full. I recently replaced the fuel pump in the tank and it's been working like a champ.

Thinking the gauge might've broken, I pulled in to fill up, and could only get 8 gallons in the tank. I'm thinking the sending unit might be broke. Any ideas on where the issue might lie?

Thanks,

 

You're lucky; I've NEVER seen the fuel light work on any of these trucks!

 

My fuel light doens't work on either of my trucks, my 88' nor my 92'

 

One other odd thing is that the fuel gauge stays at 3/4 full. But I filled up the tank this morning?

 

Still learning about Yotas, but maybe a fuel level sensor? I had mine go bad in my Sonoma...don't know if they're the same tho.

 

Kind of old thread but ... yesterday ... after 193K miles, my low fuel lamp has started to fail. The specific issues I am experiencing are:

1) lamp flickers with road bumps (like something is shorting out) after filling up the tank.

2) between 1/2 and 1/4 the lamp comes on fully (when operating correctly, it came on at 1/8 tank)

The fuel gauge seems to be working fine.

Anyone else experience this issue and find a solution?

Thanks,

Jeff

 

Didn't know the truck had fuel idiot light....



Repo

 

Does your fuel gauge drop below 3/4 as your tank level drops? I ask that because, it sounds like you have a partial ground in your circuit , causing the fuel light to come on and the fuel gauge to stay at 3/4.
The low fuel level switch is a type of variable resistance. You test it with a 3.4 w. bulb and a 12v. source in series with the switch. When it is out of liquid the the 3.4 w. bulb lights, immerse it in liquid and the bulb goes out. You test the gauge in the dash the same way 12v in series with the 3.4 w. bulb and the fuel gauge should go to about the 1/2 mark.

 

Thanks for the information. The gauge in dash still works, the only problem is relating to the low fuel lamp!