Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > Interior
Register Forgot Password?

Interior Discussion about interior restoration, repairs, and modifications.

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 12-20-2009, 03:31 PM   #1
Member
 
Slash's Avatar
 
Join Date: Oct 2009
Location: Colonie New York
Posts: 498
Car: 1988 Camaro IrocZ
Engine: Modified Holley Stealth Ram 355
Transmission: Redline Performance 700r4 Trans
Axle/Gears: Bulletproof 4thGen Ls1 SS Rear 3.73

Classifieds Rating: (0)
Gas Gauge reading wrong

DNO IF THREAD IN RIGHT SPOT
-
When the gas tank is completely full the gauge only reads 3/4th full. and it does move so it's not stuck or anything, it's like it's timing or w/e is off.
-
so as u can guess when the car gets down to reading near empty you can't help not to get edgy(even tho in retrospect theres 1/4th tank). After a bit it jus gets sketchy reading empty yet still goin u dno when u'l run out.
-
Would this mean i need a new fuel sending unit/guage or what idk much when it comes to this particular stuff.
__________________
^1988 Camaro IrocZ Owner^
www.NYTHIRDGEN.com

"I am a shadow in the night, I protect those in need and ruin those
who stand against me with their fists raised high, those who choose
to do no good shall see no mercy from me." ~Slash

Last edited by Slash; 12-20-2009 at 04:23 PM.
Slash is offline vBGarage Page   Reply With Quote
Old 12-20-2009, 06:37 PM   #2
Member
 
Slash's Avatar
 
Join Date: Oct 2009
Location: Colonie New York
Posts: 498
Car: 1988 Camaro IrocZ
Engine: Modified Holley Stealth Ram 355
Transmission: Redline Performance 700r4 Trans
Axle/Gears: Bulletproof 4thGen Ls1 SS Rear 3.73

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

bump
__________________
^1988 Camaro IrocZ Owner^
www.NYTHIRDGEN.com

"I am a shadow in the night, I protect those in need and ruin those
who stand against me with their fists raised high, those who choose
to do no good shall see no mercy from me." ~Slash
Slash is offline vBGarage Page   Reply With Quote
Old 02-21-2010, 12:23 AM   #3
Junior Member
 
Join Date: Feb 2008
Posts: 2

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

My GTA is doing the same thing.... did you find the cause?
pendragon618 is offline vBGarage Page   Reply With Quote
Old 02-21-2010, 09:03 AM   #4
Member
 
1991z28camaro's Avatar
 
Join Date: Sep 2004
Location: Sav GA (Brisbane, Australia)
Posts: 151
Car: 1991 RS ( SOLD )
Engine: 3.1 V6
Transmission: 700R4

Classifieds Rating: (3)

Re: Gas Gauge reading wrong

I am having the same prob, but mine stay's on full .
1991z28camaro is offline vBGarage Page   Reply With Quote
Old 02-21-2010, 11:17 AM   #5
Junior Member
 
f-bodymikey's Avatar
 
Join Date: Feb 2010
Location: Mulberry Arkansas
Posts: 33
Car: 84 Z-28
Engine: 355 4 bolt main
Transmission: 700 R4
Axle/Gears: Posi 3.73

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

Mine bounces around but seems to read pretty good though. I have no clue how to fix it though.
f-bodymikey is offline vBGarage Page   Reply With Quote
Old 02-21-2010, 10:53 PM   #6
Senior Member
 
matthufham's Avatar
 
Join Date: Jun 2007
Location: arlington, tx
Posts: 379
Car: 90 z28
Engine: 355 with hsr
Transmission: t56
Axle/Gears: 3.73 posi

Classifieds Rating: (5)
Re: Gas Gauge reading wrong

mine goes over full, and when empty reads 1/4... why? 3 possibilities. inaccurate gauge, inaccurate float/sending unit, resistance in the wire from the sending unit. it's not the most precise combination of parts, but it's close so i just got used to it.
__________________

........................__
..........._______ |__\__
..........|__(O)______(O)]
matthufham is offline vBGarage Page   Reply With Quote
Old 02-22-2010, 12:34 AM   #7
M20
Junior Member
 
Join Date: Nov 2009
Location: Central Missouri
Posts: 31
Car: 1989 Firebird
Engine: 2.8

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

I have this same problem in my 89' firebird. Mine started when me and my mechanic took off the cluster to get to some wiring behind them. It was perfect when we took it off. When we put it back on however it read 3/4 when I had just drove in from the gas station. I just use the trip odometer on mine. MY car gets about 220 miles to the tank. I mean you can still use the fuel guage as long as you know how far it is off. I wouldnt really worry about it.
M20 is offline vBGarage Page   Reply With Quote
Old 02-22-2010, 07:34 AM   #8
Member
 
Slash's Avatar
 
Join Date: Oct 2009
Location: Colonie New York
Posts: 498
Car: 1988 Camaro IrocZ
Engine: Modified Holley Stealth Ram 355
Transmission: Redline Performance 700r4 Trans
Axle/Gears: Bulletproof 4thGen Ls1 SS Rear 3.73

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

nah i havn't found the problem yet, but then again i havn't had much time to work on the iroc yet, it's too cold up here in new york to start sitting out inthe garage to work in the garage, not to mention car is not registered yet so i can't bring it to school garage yet. Getting the Car registered in march so soon to be able to start.
-
and yes it can be either gauge, fuel sending unit.

Dno if i could get used to it but worst comes to worst i'll have to. jus hope it's a easy fix.
__________________
^1988 Camaro IrocZ Owner^
www.NYTHIRDGEN.com

"I am a shadow in the night, I protect those in need and ruin those
who stand against me with their fists raised high, those who choose
to do no good shall see no mercy from me." ~Slash
Slash is offline vBGarage Page   Reply With Quote
Old 02-24-2010, 10:53 AM   #9
Junior Member
 
Join Date: Mar 2008
Location: Charlotte, NC
Posts: 99
Car: 86 IROC
Engine: LS6
Transmission: 4L60E
Axle/Gears: 3.08

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

It could be as simple as improving the ground.
midnit is offline vBGarage Page   Reply With Quote
Old 01-30-2011, 12:09 PM   #10
Member
 
1983Chimaera's Avatar
 
Join Date: Sep 2006
Location: San Antonio, Tx
Posts: 431
Car: 1983 Camaro Z/28 T-Top
Engine: TPI 4-bolt .040" 327, LT4 Hot Cam
Transmission: TCI Streetfighter 700R4
Axle/Gears: 95 Z/28 3.23, Posi diff, rear disc

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

The bouncing problem stems from GM being too cheap to install a baffle around the pickup/sending unit in the tanks. So as you go down the road, accel or decel, the fuel level sloshes around and gives an inaccurate reading. My neighbor had an 87 TBI 305 with the factory tank that would constantly bounce from near full to near empty just maintaining 70 mph on level road. My 83 Z/28 originally had a 4BBL carb 305, and now has a 331ci TPI, still using the original tank and pickup/sensor unit (with an external mounted MSD 2225 inline electric high flow fuel pump), and it doesn't bounce like his did, so there is no rhyme or reason to it. Mine does deviate badly under accel or decel tho as the fuel level sloshes around. If I could figure out a way to install a baffle around the unit like my 94 Mustang has I know it would solve the issue (and works handily as a safety "reserve" to keep from running the fuel pump dry on an EFI system).
1983Chimaera is offline vBGarage Page   Reply With Quote
Old 02-24-2011, 07:23 PM   #11
Junior Member
 
Join Date: Jan 2011
Posts: 45
Car: 89 Iroc z camaro
Engine: 350 TPI
Transmission: Auto
Axle/Gears: stock

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

Am i the only one like this? my guage reads pretty normal (i mean it bounces around ALOT but when i cruse for awhile it levels to correct) But what worries me is if i SLAM on the gas even for just a few seconds when it goes back down it reads WAY lower than it did befor!!! I cant tell so is me slamming on the gas really using like a whole gallon or more of fuel for just a few seconds?!?!?!?! please tell me im not the only one like this ??
jeremymsl is offline vBGarage Page   Reply With Quote
Old 02-24-2011, 07:57 PM   #12
Junior Member
 
Join Date: May 2010
Location: missouri
Posts: 36
Car: 91 Camaro RS
Engine: 350 carb'd
Transmission: 700r4

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

Mine does that too, I mean I know im not getting that good of mileage but it can't be that bad lol. my problem is that my guage shows a different level when driving than it does parked so which do I trust?
camaroman91 is offline vBGarage Page   Reply With Quote
Old 02-24-2011, 08:05 PM   #13
Junior Member
 
Join Date: Jan 2011
Posts: 45
Car: 89 Iroc z camaro
Engine: 350 TPI
Transmission: Auto
Axle/Gears: stock

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

i trust my crusing speed, like after you get up to 50 then dont slow down just stay steady, that always seems to be the best, parked is right after you brake wich brings the guage down ya know? But so yours will go down by like an 8th of a tank than where it was befor after you floor it to? so its not using that much the guage is just wrong right haha? im like really worried about that haha XD
jeremymsl is offline vBGarage Page   Reply With Quote
Old 02-24-2011, 09:18 PM   #14
Junior Member
 
Join Date: May 2010
Location: missouri
Posts: 36
Car: 91 Camaro RS
Engine: 350 carb'd
Transmission: 700r4

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

I like that cause thats the higher of the 2 lol, but yea mine drops about that much after WOT, Its scary cause I know it can't be using that much gas lol
camaroman91 is offline vBGarage Page   Reply With Quote
Old 02-24-2011, 10:09 PM   #15
Junior Member
 
Join Date: Jan 2011
Posts: 45
Car: 89 Iroc z camaro
Engine: 350 TPI
Transmission: Auto
Axle/Gears: stock

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

Whew I'm just glad cause that means I'm not the only one and it is just the gauge XD, dose yours hi back after a day or 2 out dose it just go thru the rest of the tank that much lower? I dint know cause I only floor it when I'm almost out of gas so I'm just like **** it I'm about to be out anyways XD
jeremymsl is offline vBGarage Page   Reply With Quote
Old 02-24-2011, 10:35 PM   #16
Member
 
excessiveego's Avatar
 
Join Date: Nov 2009
Location: Pittsfield, NH
Posts: 174
Car: 1988 Base Coupe
Engine: 350
Transmission: T5
Axle/Gears: 9 bolt w/ disk brakes - 3.70

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

mine reads normal until you hit about half a tank, then it reads really high (around 3/4) then once you shut it off and restart it it will start reading normal and jump around just alittle until empty..... and im talking electronic problems, not just fuel slosh
excessiveego is offline vBGarage Page   Reply With Quote
Old 02-27-2011, 07:10 PM   #17
Junior Member
 
Join Date: May 2010
Location: missouri
Posts: 36
Car: 91 Camaro RS
Engine: 350 carb'd
Transmission: 700r4

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

Yea I do the same thing, I go easy on it until I'm almost outta gas anyways lol. but I'm not sure about mine though. How much does it actually cost to fill out tanks up? Cause it seems like no matter how much gas I put in it it always goes to 3/4 but then after I start driving and go a couple of miles it shows like 1/4 less than before
camaroman91 is offline vBGarage Page   Reply With Quote
Old 02-27-2011, 09:27 PM   #18
Supreme Member
 
drknow90rs_ss@y's Avatar
 
Join Date: Apr 2008
Location: Wittman,Az
Posts: 2,825
Car: 90 RS Camaro, 85 Trans Am, 86 IROC
Engine: 427 ci LS1/383 FI/305 TPI
Transmission: T-56/ T-56/ 700R4

Classifieds Rating: (3)
Re: Gas Gauge reading wrong

This is such a common prob with our cars. Only way to fix it most of the time is to replace the sender. Not cheap, either!
drknow90rs_ss@y is offline vBGarage Page   Reply With Quote
Old 02-28-2011, 05:25 PM   #19
Supreme Member
 
MNformula350's Avatar
 
Join Date: Oct 1999
Location: Minnesota
Posts: 1,750
Car: 1990 Formula
Engine: 350 TPI
Transmission: Auto
Axle/Gears: 3:73 Posi

Classifieds Rating: (1)

Re: Gas Gauge reading wrong

Quote:
Originally Posted by M20 View Post
I just use the trip odometer on mine. MY car gets about 220 miles to the tank.
I have the Exact same issue with my Formula, Gauge only Reading 3/4 when Full. Just started doing that one day

So I also Just Use my Trip Odoemter, and my Formula also gets about 220 per tank.
__________________
MNformula350 on Fquick <-Click

<<<<<< 1990 Pontiac Firebird Formula 350 >>>>>>
MNformula350 is offline vBGarage Page   Reply With Quote
Old 02-28-2011, 05:27 PM   #20
Supreme Member
 
MNformula350's Avatar
 
Join Date: Oct 1999
Location: Minnesota
Posts: 1,750
Car: 1990 Formula
Engine: 350 TPI
Transmission: Auto
Axle/Gears: 3:73 Posi

Classifieds Rating: (1)

Re: Gas Gauge reading wrong

Quote:
Originally Posted by drknow90rs_ss@y View Post
This is such a common prob with our cars. Only way to fix it most of the time is to replace the sender. Not cheap, either!
Or Fun

Last time I had the Gas Tank out of the Car, I worked at a GM Dealership, so had all the lifts and tools etc... and it was still a pain.
MNformula350 is offline vBGarage Page   Reply With Quote
Old 02-28-2011, 06:29 PM   #21
Senior Member
 
Convoy25's Avatar
 
Join Date: Apr 2008
Location: Somerset, New Jersey
Posts: 806
Car: 95 Z85 S10, 99 Formula
Engine: 4.3 CPI , LS1
Transmission: NV3500, T56
Axle/Gears: 3.08, 3.42

Classifieds Rating: (3)
Re: Gas Gauge reading wrong

with the tank dropped its a good time to paint the rear end if its not already
Convoy25 is offline vBGarage Page   Reply With Quote
Old 03-01-2011, 03:16 AM   #22
Member
 
Slash's Avatar
 
Join Date: Oct 2009
Location: Colonie New York
Posts: 498
Car: 1988 Camaro IrocZ
Engine: Modified Holley Stealth Ram 355
Transmission: Redline Performance 700r4 Trans
Axle/Gears: Bulletproof 4thGen Ls1 SS Rear 3.73

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

lol wow ya'll brought back like my first ever thread i made >.>
-
Still never had time or money to fix this yet. I just been filling up often guessing how much I've used lol
Slash is offline vBGarage Page   Reply With Quote
Old 03-14-2011, 08:10 PM   #23
Junior Member
 
Join Date: Feb 2011
Location: Long Island, NY
Posts: 1
Car: 1991 Chevrolet Camaro
Engine: 305ci 5.SLOW
Transmission: 700R4
Axle/Gears: 3:23

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

They bounce around because the sending units bad on the fuel pump; out comes the rear to drop the Gas tank. and might as well replace the fuel pump while you have it out dont want to do have to drop that thing twice i promise you that. And there is a possibility that the gauge is no longer good(slim to none)
Gen3-91 is offline vBGarage Page   Reply With Quote
Old 03-15-2011, 09:54 PM   #24
Member
 
Slash's Avatar
 
Join Date: Oct 2009
Location: Colonie New York
Posts: 498
Car: 1988 Camaro IrocZ
Engine: Modified Holley Stealth Ram 355
Transmission: Redline Performance 700r4 Trans
Axle/Gears: Bulletproof 4thGen Ls1 SS Rear 3.73

Classifieds Rating: (0)
Re: Gas Gauge reading wrong

My problem wasn't it bouncing around.
-
Its reading 1/4full when it was actually almost a full tank. So once i droped below 3/4 of a tank left.. it would read the tank was empty. ect. Idk why they went off topic on that o.O
Slash is offline vBGarage Page   Reply With Quote
Old 03-17-2011, 09:49 AM   #25
Supreme Member
 
travis401's Avatar
 
Join Date: Mar 2007
Location: Arlington, Tx
Posts: 3,524
Car: 91 Camaro RS
Engine: empty bay (for now)
Transmission: Built T-56
Axle/Gears: 3.42 stock posi disc

Classifieds Rating: (1)
Re: Gas Gauge reading wrong

There is an alternative to replacing the sending unit (if your guage doesnt read or doesnt read full when it is). It does required dropping the tank and pulling the sending unit out though.

If you look at the attatched image, there is a spot circled in red. Its the fuel level reader. Usually the contact or contact strip inside gets corroded or stuck or basically doesnt move like it should. You can pop this peice open and clean it off, it just requires bending the tiny little tabs holding the 2 peices together and cleaning everything out with some alcohol and a brush. Just dont use anything too stiff or you might destroy the contact strip.

Not saying this will solve every fuel level issue, but you can atleast clean this off and then hook the unit back to the wiring harness outside the tank to test if the sender is bad or not. You can manually manipulate the fuel float while someone watches the gauge in the car.
Attached Images
File Type: jpg 763470_106_full.jpg (47.2 KB, 79 views)
travis401 is offline vBGarage Page   Reply With Quote
Old 03-13-2012, 08:53 AM   #26
Member
 
Join Date: Mar 2010
Location: St. Louis, MO
Posts: 177
Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4

Classifieds Rating: (2)
Re: Gas Gauge reading wrong

Sorry posted in wrong forum

Last edited by dredre08; 03-13-2012 at 08:56 AM. Reason: Posted in wrong forum
dredre08 is offline vBGarage Page   Reply With Quote
Old 03-13-2012, 08:53 AM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Interior

Tags
1988, 1991, camaro, fix, fuel, full, gas, gauge, gauges, gaugh, reading, reads, rs, working, wrong
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 08:38 PM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details