Incorrect fuel gauge reading

[HAWAIIZR-1]

Okay, ever since I have owned this car I have hated the fact that the fuel gauge reading is incorrect.

I know I must have the fuel tank bladder issue and intend on replacing the tank later this year.

If I fill up the tank it only reads about 3/4 full and in addition when it says it is almost empty I actually have about 1/2 tank and incorrect reading all in between.

Has anyone ever corrected this issue by adjusting their float assembly? I thought I read somewhere that you simply remove the assembly and bend the arm for the float in the direction that will get it away from the collapsed bladder causing the float to hang up on the bladder, but I surely don't want it to be worse.

The problem I have is to take the car to emissions testing it has to be weighed first without spare tire/tools and a full tank of gas. There will already be lost in translation issues here in Japan so I don't want to have to try to explain that the tank is full and the gauge is broken as they might not let me take the test even though they might be able to look into the filler and see that it is full.

Since it is a pretty big job with removal of the bumper I figured I would try this during the winter to replace out the gas tank. I just want to get it fixed for now even thought I know I don't have a full tank capacity with the collapsed liner issue.

Thanks in advance.

Craig

[tomtom72]

http://zr1netregistry.com/ZR1_issues.htm#7

This gives the correct ohm readings for empty & full. I remember reading a write up on replacing our pumps written by Juan from TX where he talked about checking the sending unit for accuracy .....if I find it I'll post a link. Sorry i don't have all the ducks in a row Craig.

:cheers:
Tom

http://home.comcast.net/~zrjuan/sender.html

[4-cam]

You could just install a 90 ohm resistor across the connector to send a false reading to the gauge. I have done this for other control applications at work before to get out of a bind.

[HAWAIIZR-1]

http://zr1netregistry.com/ZR1_issues.htm#7

This gives the correct ohm readings for empty & full. I remember reading a write up on replacing our pumps written by Juan from TX where he talked about checking the sending unit for accuracy .....if I find it I'll post a link. Sorry i don't have all the ducks in a row Craig.

:cheers:
Tom

http://home.comcast.net/~zrjuan/sender.html

Thanks Tom! You always go out of your way to help. I can't remember where I found the info about making the adjustment for this issue and I guess I might to just pull the assy to see what is going on in there and if in fact it is a collapsed liner or not.

[HAWAIIZR-1]

You could just install a 90 ohm resistor across the connector to send a false reading to the gauge. I have done this for other control applications at work before to get out of a bind.

Thanks. I'm going to have someone call the testing location to see about the fuel gauge versus the full tank requirement for testing and weigh station. Maybe not so serious and they will just look into the filler to confirm full tank.

[tomtom72]

Craig, the second link I posted is the write-up by Juan from TX that I was looking to track down. That's the one about adjusting the sending unit.

I hope all things are well with you and your wife over in Japan!

:cheers:

[HAWAIIZR-1]

Craig, the second link I posted is the write-up by Juan from TX that I was looking to track down. That's the one about adjusting the sending unit.

I hope all things are well with you and your wife over in Japan!

:cheers:

Tom,

Thanks again and I printed the article so I can refer to it. I'm not sure if it is the same problem, but thinking that since I have a complete, new fuel assembly just replace the entire thing and dry test described. If I find I have the famous collapsed liner then I might be able to adjust the float arm accordingly to get a more accurate reading. The more I am thinking about it I might have heard about it from Gordon when I went to his school in 2006. I hope all is well you and your family too and all is well on this end. The Z runs great and better than ever, just the gremlins that have been haunting me since I got it and want to fix it once and for all. I don't think that exists for our cars. I have a seat belt light and INFL REST to deal with too. :handshak:

Craig