This will take you to the main site where there is history, technical information and other information on these cars.
This takes you back to the main page of the forums.
This is the control panel to change your password, information and preferences on this message board.
Click here if your lost your password or need to register on this message board. You must be a registered user to post. Registration is free.
Search this board for information you need.
Click here to buy cool Squarebirds mechandise.
Click here to support Squarebirds.org. For $20 annually receive 20mBytes webspace, a Squarebirds e-mail address and member's icon on the message board.
  #1  
Old 07-09-2018, 01:02 PM
blue62tbird blue62tbird is offline
Experienced
 
Join Date: Mar 7 2018
Posts: 157
blue62tbird is on a distinguished road
Default Fuel tank access

Is there fuel tank access from the trunk or do I need to drop the tank to get to the float /pickup device? I have a gas gauge that has only worked 2 times for a short drive since I got the car. I assume it could be a ground issue from the unit wiring or I need to replace it all.
__________________
Tim
1962 Conv Tbird
1993 Miata LE
1994 Miata
Reply With Quote
  #2  
Old 07-09-2018, 01:26 PM
jopizz's Avatar
jopizz jopizz is offline
Excellent Auto Mechanic for over 40 years.
 
Join Date: Nov 23 2009
Posts: 5,384
jopizz is on a distinguished road
Default

Yes, you can get to the sender through the access panel in the trunk.

John
__________________
John Pizzi - Squarebirds Administrator
1959 Convertible

Thunderbird Registry #36223
jopizz@verizon.net 856-779-9695

http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm
Reply With Quote
  #3  
Old 07-09-2018, 02:37 PM
blue62tbird blue62tbird is offline
Experienced
 
Join Date: Mar 7 2018
Posts: 157
blue62tbird is on a distinguished road
Default

What are my chances it is just bad. I know (I thought anyway) that a bad ground can also cause a malfunctioning gauge?
__________________
Tim
1962 Conv Tbird
1993 Miata LE
1994 Miata
Reply With Quote
  #4  
Old 07-09-2018, 02:54 PM
blue62tbird blue62tbird is offline
Experienced
 
Join Date: Mar 7 2018
Posts: 157
blue62tbird is on a distinguished road
Default

reading other threads on gas tank gauge issues. What is the CRV? My temp gauge is working.
__________________
Tim
1962 Conv Tbird
1993 Miata LE
1994 Miata
Reply With Quote
  #5  
Old 07-09-2018, 03:19 PM
YellowRose's Avatar
YellowRose YellowRose is offline
Super-Experienced and a HELLOFA nice guy
 
Join Date: Jan 21 2008
Posts: 12,519
YellowRose is on a distinguished road
Default Fuel tank access

Hi Tim, If that is the original fuel sending unit in the tank, the chances of it having gas in the float, or being defective are good. After all, it is probably as old as you are! The CVR unit is the Constant Voltage Regulator which, in the case of our Squarebirds, and probably your Tbird, located on the back of the instrument panel. The CVR unit takes the 12v from the battery and changes it to an oscillating 0-6V for the 6V gauges in these old Tbirds of our. Yes, the gauges are 6v. What can happen if the CVR unit fails is that the 12v can go right through the CVR unit and attack the wiring of the gauges. The fact that your Temp gauge and others are still working well indicates that your CVR is okay. You may have a problem with the fuel sending unit in the tank. I did on my Squarebird, and when I pulled it out I found the plastic (in some cases metal) float was full of gas. And after some 50+ years of use, the electrical rheostat on it was all corroded and shot. So I bought a new one, and replaced it, grounded it properly and that fixed that problem. Plus, as many of us do, I also added a heavy ground wire to the flange of the gas tank, cleaned off a good spot on the frame and grounded the tank to that. Just make sure if you drill a hole in the tank that it is NOT the tank itself, but a flange where no gas is... Try these things and that might fix your problem. BTW, IF that CVR unit ever goes out on you, you DO risk the 12v getting to the gauges and frying the wiring. It costs several hundred bucks to get those gauges fixed. Ask me how I know... lol.. Our dynamic webmaster, Dave Dare ~ simplyconnected, has a special he runs for our users who become Paid Members, which I see you are not. $20yr paid through PayPal gets you many additional advantages that non-Paid members do not have. One of them is a discount on buying his solid state CVR unit, guaranteed for life. He would need you to send him your CVR unit off your instrument panel so he can build his solid state CVR unit in it and send it back to you. His unit is set up to prevent 12v from going to the gauges should it fail. To my knowledge, none have to this point. You might want to check into this. This is a good way to say a bit of money and become a Paid Member. The money from Paid Memberships is what keeps this Forum going, and helps pay the server bills.... For more information on Paid Memberships, check up the top of the Forum and you will find the information there in the Announcements section.
__________________

Ray Clark - Squarebirds Administrator
'59 Tbird "The Yellow Rose Of Texas" aka "Tweety Bird"
"It's Hip To Be Square"
Thunderbird Registry #33025 VTCI #11178

Contact me via Private Message or (Home) 210-674-5781 (Cell) 210-875-1411
http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm
Reply With Quote
  #6  
Old 07-09-2018, 03:29 PM
blue62tbird blue62tbird is offline
Experienced
 
Join Date: Mar 7 2018
Posts: 157
blue62tbird is on a distinguished road
Default

I just read up on the CRV and it touched on things you just wrote, sorry you had to write all that. My temp gauge works fine, it stays cool and goes up to the same point every time where the car is at running temp. The gas gauge always goes to about 1/4 and sits there when full or thereabouts. It may go down some but I am so scared to run out of gas I keep it fuel after so many miles of driving. Only two times has it read what I thought was correct.
Seems my issue could be sending unit/float or ground?
__________________
Tim
1962 Conv Tbird
1993 Miata LE
1994 Miata
Reply With Quote
  #7  
Old 07-09-2018, 03:38 PM
jopizz's Avatar
jopizz jopizz is offline
Excellent Auto Mechanic for over 40 years.
 
Join Date: Nov 23 2009
Posts: 5,384
jopizz is on a distinguished road
Default

You may have gas in the float. That would cause the gauge to never go up to the full mark. It could also be a bad ground. You can ground the sender with out removing it. Remove the access panel and clip a wire from the sender to the body of the car. If the gauge works correctly then it's a ground issue. If it still stays at 1/4 then it could be the sender itself that's bad or the float as I mentioned. You will have to remove the sender to find out.

John
__________________
John Pizzi - Squarebirds Administrator
1959 Convertible

Thunderbird Registry #36223
jopizz@verizon.net 856-779-9695

http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm
Reply With Quote
  #8  
Old 07-09-2018, 03:40 PM
YellowRose's Avatar
YellowRose YellowRose is offline
Super-Experienced and a HELLOFA nice guy
 
Join Date: Jan 21 2008
Posts: 12,519
YellowRose is on a distinguished road
Default Fuel tank access

Tim, I understand the problem, because I have the same thing on my Squarebird. I do not trust it below 1/4 of a tank, having run out of gas once. However, IF, and I think it is, your Bulletbird fuel and temp gauge is like the Squarebirds, there is an adjustment on the back of that gauge. There is one on the top for the Fuel Gauge and one on the bottom for the Temp gauge. There are two little gears on the left and the right at the top for the Fuel gauge and a matching set of gears at the bottom for the Temp gauge. To get to this gauge you are going to have to take that gauge out of the instrument panel. With either the gas tank empty or as full as you can get it (providing your fuel sending unit float is not full of gas. You may want to check that first), you can turn the gears with a small screwdriver slightly while watching the gauge (still hooked up to power) and watch to see if it goes up or down in reading. I have forgotten if the left hand gear adjusts it down or up, but I think down, and I think the right side raises the reading up. You will have to play with it to see what it does. If the tank is Full, it should be sitting on the F. If it I Empty, it should be sitting on the E. Since you are happy with where the Fuel gauge is reading do NOT touch it.
__________________

Ray Clark - Squarebirds Administrator
'59 Tbird "The Yellow Rose Of Texas" aka "Tweety Bird"
"It's Hip To Be Square"
Thunderbird Registry #33025 VTCI #11178

Contact me via Private Message or (Home) 210-674-5781 (Cell) 210-875-1411
http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm
Reply With Quote
  #9  
Old 07-09-2018, 03:48 PM
blue62tbird blue62tbird is offline
Experienced
 
Join Date: Mar 7 2018
Posts: 157
blue62tbird is on a distinguished road
Default

I am not happy, ha ha ha. It is always at 1/4 full, drops down a little when I drive some gas out of it, I think. Hard to tell. When I fill the tank it stays at the place. Two times the gauge has read what I feel is the correct reading just based on knowing what gas amount was in the tank. Since the other gauges work, I feel it is maybe ground or float/sending unit issue.
Talk of gears? Have not read anything about that.
__________________
Tim
1962 Conv Tbird
1993 Miata LE
1994 Miata
Reply With Quote
  #10  
Old 07-09-2018, 03:55 PM
jopizz's Avatar
jopizz jopizz is offline
Excellent Auto Mechanic for over 40 years.
 
Join Date: Nov 23 2009
Posts: 5,384
jopizz is on a distinguished road
Default

If your gauge only goes up to 1/4 most of the time it's not an adjustment problem with the gauge. What Ray is talking about is for making minor adjustments. That's not what you are describing.

John
__________________
John Pizzi - Squarebirds Administrator
1959 Convertible

Thunderbird Registry #36223
jopizz@verizon.net 856-779-9695

http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm
Reply With Quote
Reply


Thread Tools
Display Modes

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 09:43 AM.

Driving, racing or working on cars can be hazardous. The procedures and advice on this website including the message board are opinion only. Squarebirds.org and its webmasters and contributors do not guarantee the correctness of the advice and procedures. The Squarebirds.org and its webmasters assume no liability for any damage, fines, punishment, injury or death resulting from following these procedures or advice. If you do not have the skills or tools to repair your car, please consult a professional. By using this site you agree to hold harmless the Squarebirds.org, its authors and its webmasters from any resulting claim and costs that may occur from using the information found on this site.

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Any submissions to this site and any post on this site becomes property of Squarebirds.org . The webmasters reserve the right to edit and modify any submissions to this site. All material on this is site is copyrighted by the Squarebirds.org. Reproduction by any means other than for personal use is strictly prohibited. Permission to use material on this site can be obtained by contacting the webmasters. Copyright 2002-2016 by Squarebirds.org.