2G Gas gauge reads off.

rambow70 · Sep 3, 2015

So I have a 2g gst, this question has been asked a lot, I looked into it. Here is what I found. Our fuel tanks are 15 gallons. My gas gauge is very laggy. At E I can only put 10 gallons of fuel in it max. I assumed we had a 10 gallon tank. But if it is 15 then on E I should have 5 gallons left? People say to adjust the arm on the assembly when the tank is full. Some say it is a ground. I guess I am not sure how to do either of those things. My 98 3000gt had the same laggy problem but it read correctly at 20 gallons. My best range is 270 miles for 10 gallons putting me at 27mpg but usually 250 miles at 25mpg. But if I had a 15 gallon tank I am calculating wrong and have more room for gas. I guess it isn't an issue, I mean I will (should) never run out having 5 gallons before the light comes on, which it never has. But it would be nice if it worked. There are no dents in tank either. 100% stock car too.

luv2rallye · Sep 3, 2015

All 2g's read off on the empty mark. On my 99GST it doesn't run empty until the needle is past the empty hask mark and almost touching the edge of the gauge.

rambow70 · Sep 3, 2015

luv2rallye said:
All 2g's read off on the empty mark. On my 99GST it doesn't run empty until the needle is past the empty hask mark and almost touching the edge of the gauge.

So you have a 99, is it confirmed 25 gallons? Most post are 95-98 are 25. My gf had a 99 gst that had 180k, beat to crap, and it's gauge worked flawlessly, responded well and read well. I don't remember it's capacity though. It just didn't lag.

2gmitsueclipse · Sep 3, 2015

rambow70 said:
So you have a 99, is it confirmed 25 gallons? Most post are 95-98 are 25. My gf had a 99 gst that had 180k, beat to crap, and it's gauge worked flawlessly, responded well and read well. I don't remember it's capacity though. It just didn't lag.

If you would like to read the provided link below and edit your post, feel free to......

http://members.shaw.ca/costall/1000Q/answers-specifications.htm

luv2rallye · Sep 4, 2015

15.9 gal on my 99 GST.

crash89 · Sep 4, 2015

^^ Boom! Beat me to it. I was in the same boat quite a few years back. Was getting not very many miles per tank but seemed to get decent milage and I thought the tanks were larger but didnt know the exact capacity. On week I just said screw it, I'd never seen the low fuel light come one before, so I drove until either the light came on or I ran out.. Well, the light came on way passed E. Almost the equivalent to another 1/4 on the gauge, just below the Empty mark. Put a small gas can in your trunk and run until the light comes on or you run out.. You'll find out.

rambow70 · Sep 4, 2015

crash89 said:
^^ Boom! Beat me to it. I was in the same boat quite a few years back. Was getting not very many miles per tank but seemed to get decent milage and I thought the tanks were larger but didnt know the exact capacity. On week I just said screw it, I'd never seen the low fuel light come one before, so I drove until either the light came on or I ran out.. Well, the light came on way passed E. Almost the equivalent to another 1/4 on the gauge, just below the Empty mark. Put a small gas can in your trunk and run until the light comes on or you run out.. You'll find out.

I do a lot of highway driving to class and work so I can't afford to run out, I will probably test my limits until the dummy light comes on. I do the whole kroger gas thing and end up wasting points when I could be filling my car up more. But as far as a laggy gauge is it the assembly in the tank? But good info, thanks!

Also has anyone fixes this issue with an aftermarket fuel pump/reading assembly? Or just got to live with it?

2gmitsueclipse · Sep 4, 2015

On the FWD 2g, the fuel level float is the center most access under the rear seat. On the AWD, there are actually 2 level floats wired in series due to the tank design.
Pictured below are both fuel sending units. FWD on the left, AWD on the right:

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This issue has been brought up many times. On two of my 2g's (AWD and FWD), I never put in more than 12 gallons of fuel when the gauge reads nearly empty. As far as I know, there is not a fix for this issue than just testing if resistance is within spec.

luv2rallye · Sep 4, 2015

It's easiest to just get used to where the real empty is (if you're worried, run it out once with some gas in a gas can. Then you'll know for the rest of the car ownership) . If you do something like bend the float up to make the empty mark more accurate, then the full mark won't be correct. Not to mention that to get at the float is a pain and you'll have to break the tank seal which then will have to be replaced (and sometimes you'll break off the fuel line which is all rusted). On my 99 the fuel light comes on when there is still at least 2 gallons left.

rambow70 · Sep 4, 2015

luv2rallye said:
It's easiest to just get used to where the real empty is (if you're worried, run it out once with some gas in a gas can. Then you'll know for the rest of the car ownership) . If you do something like bend the float up to make the empty mark more accurate, then the full mark won't be correct. Not to mention that to get at the float is a pain and you'll have to break the tank seal which then will have to be replaced (and sometimes you'll break off the fuel line which is all rusted). On my 99 the fuel light comes on when there is still at least 2 gallons left.

Awesome, thanks guys. But as far as it being slow to respond to fuel changes, being laggy, is there a fix? I'll probably just deal with it for now. I didn't pay too much for it.

luv2rallye · Sep 5, 2015

No fix. Being slow to respond to fuel changes is the type of gauge it is (bi-metal strip that heats up with current change - chosen because of lower cost). Just be thankful it stays at it's last position after power off or it would really drive you crazy.

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