Search



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

Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

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 07-22-2008, 07:11 PM   #1
Senior Member
 
Join Date: Feb 2006
Location: newcomerstown,o
Posts: 645
Car: 91 formula
Engine: 350 tpi
Transmission: auto
Axle/Gears: poss

Classifieds Rating: (0)
best time to read gas gauge

whenm i first get in the car it says one thing ,then when the key is in "on" position it moves up. so which one is most likely true? it's never been on "E "before and isn't now either .are these car supposed to go to "E" when you turn the car off?
bbsr72 is offline vBGarage Page   Reply With Quote
Old 07-22-2008, 08:33 PM   #2
Senior Member
 
firebird896's Avatar
 
Join Date: Sep 2007
Location: Chicagoland Area
Posts: 617
Car: '89 GTA/'86 TA/98 TA
Engine: 350/350/LS1
Transmission: R4/T5/4L60E
Axle/Gears: 3.23/2.77/3.73

Classifieds Rating: (0)
Re: best time to read gas gauge

mine doesnt
firebird896 is offline vBGarage Page   Reply With Quote
Old 07-22-2008, 08:41 PM   #3
Member
 
cameron7710's Avatar
 
Join Date: Jun 2007
Location: lynnwood,Washington
Posts: 474
Car: 1992 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 2.73

Classifieds Rating: (0)
Send a message via AIM to cameron7710
Re: best time to read gas gauge

mine dosent go to e. i would trust when the cars on more than when its off
cameron7710 is offline vBGarage Page   Reply With Quote
Old 07-23-2008, 08:52 AM   #4
Member
 
Join Date: Apr 2005
Location: tasmania australia
Posts: 308
Car: 1985 z28 camaro
Engine: 305 lg4,edelbrock,3"air cleaner.k&n
Transmission: turbo 700r4 w/b&m megashifter
Axle/Gears: Stock.

Classifieds Rating: (0)
Re: best time to read gas gauge

Most fuel gauges will go to empty when the key is off,unless they have a hold function,which these cars dont have.the needle will move when power is applied.
alicat is offline vBGarage Page   Reply With Quote
Old 07-23-2008, 10:22 AM   #5
Senior Member
 
Join Date: Feb 2006
Location: newcomerstown,o
Posts: 645
Car: 91 formula
Engine: 350 tpi
Transmission: auto
Axle/Gears: poss

Classifieds Rating: (0)
Re: best time to read gas gauge

i hear tell cars with floating gauges don't go to E because there is stuff built up on the sending unit ,because most people don't run around on E? therefore, not letting the float go all the way down even though there isn't that much gas in the tank.
bbsr72 is offline vBGarage Page   Reply With Quote
Old 07-23-2008, 12:12 PM   #6
Supreme Member
 
ghettocruiser's Avatar
 
Join Date: Sep 2002
Location: PA
Posts: 3,595
Car: 86 Trans AM
Engine: LS1 (not stock...)
Transmission: Built T56
Axle/Gears: Strange 12-bolt w/ 3.73

Classifieds Rating: (2)

Send a message via AIM to ghettocruiser
Re: best time to read gas gauge

Ok...to answer the question at hand. Reading the gauge with the ignition off tells you NOTHING... There has to be current running through the sender wire to the level sender in the tank in order for the gauge to read. If you shut the car off with a full tank, and the gauge still says full, and let the car sit for 10 years, and turn the car on, it will start off at full, but will quickly drop to where it needs to be due to evaporation. Thats the way sending units work. Its a measure of the resistance to ground. If there isnt voltage (usually less than 12 volts) going through the sender wire, the gauge wont read tank level. If you were to cut the sender wire, then turn your ignition on...the gauge would peg due to reading infinite resistance to ground. Not sure off hand which direction it would peg tho...

Now...as to why the fuel gauge doesnt go to zero when the car's shut off. I have a thought about that. Gauges in newer cars have buffers built in to them so that the sloshing fuel doesnt make them jump up and down. If they didnt have this, they would be all over the place (i.e. my 67 bonneville. no idea how much fuel was in that thing at any given time haha). I THINK...THINK...fuel gauges have an "air core" to dampen the movement. When you turn the gauge off, it doesnt "free drop" like the other gauges. The needle doesnt just go back and forth freely like the others. If you take a cluster, you can move the otehr gauges around all you want and they sort of spring back. But the fuel gauge is kind of stiff.

Im pretty sure thats how my autometer gauge works... Some cars might have the buffer thing in the tank, but Im 98% sure thirdgens dont.

Someone can correct me if Im wrong on the not going to zero thing...but I think thats what it is.

J.

Last edited by ghettocruiser; 07-23-2008 at 12:18 PM.
ghettocruiser is offline vBGarage Page   Reply With Quote
Old 07-23-2008, 12:12 PM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

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

Tags
1989, amount, back, camaro, doesnt, empty, floating, fuel, gas, gauge, hand, key, proper, read, rs, shut, time, wont
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 05:16 AM.


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