79 Bonnie gas guage - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 01-05-2003, 03:59 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Dec 2002
Location: scranton pa
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
1979bonnie is on a distinguished road
Default 79 Bonnie gas guage

The gas gauge in my 79 bonnie all of a sudden wil not work anymore it flew up past a ful tank and just lies fla and doenst move. What could be the problem here???
1979bonnie is offline   Reply With Quote
Old 01-05-2003, 04:10 PM   #2
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

I'd bet my dime on the sending unit in the gas tank. Try filling your tank 3/4 full and then drive the hell out of it on a twisty road. Hard brakes, hard accellerating.....see if you can free it up. If not, you'll be dropping your tank soon.
willwren is offline   Reply With Quote
Old 01-05-2003, 08:42 PM   #3
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Dec 2002
Location: scranton pa
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
1979bonnie is on a distinguished road
Default

its a 79 does it even have a sending unit?
1979bonnie is offline   Reply With Quote
Old 01-05-2003, 11:59 PM   #4
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

If it has a gauge.
willwren is offline   Reply With Quote
Old 01-06-2003, 12:26 PM   #5
Senior Member
True Car Nut
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default

Its not worth your money or time to fix it if driving the hell out of it doesn't work. Believe me.
Allmachtige is offline   Reply With Quote
Old 01-06-2003, 04:42 PM   #6
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Dec 2002
Location: scranton pa
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
1979bonnie is on a distinguished road
Default

Yeah youre probably right thtanks for the help
1979bonnie is offline   Reply With Quote
Old 01-06-2003, 04:48 PM   #7
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Hey, it'* not really that big a deal to drop a tank. Do the slosh thing first, then look into it. Cheapest parts are at www.gmpartsdirect.com usually 40 percent off retail.
willwren is offline   Reply With Quote
Old 01-06-2003, 06:39 PM   #8
Guest
 
Posts: n/a
Default

very rarely does a sending unit go bad on the older models of GM. drop your tank and check the ground that attaches to the top of the gas tank. they usually get rusty and lose their contact.
  Reply With Quote
Old 01-09-2003, 04:45 PM   #9
Senior Member
True Car Nut
 
Join Date: Sep 2002
Location: Chicago, IL
Posts: 2,409
Thanks: 0
Thanked 1 Time in 1 Post
acg_ssei is on a distinguished road
Default

> The gas gauge in my 79 bonnie all of a sudden wil not work anymore
> it flew up past a ful tank and just lies fla and doenst move.

IIRC, if the signal wire going back to the tank gets disconnected anywhere (i.e. open), it'll peg the gauge on Full as you describe. By comparison, if it shorts to ground, I _think_ it will peg on Empty instead. So I would trace that wire to the back and check that it'* got voltage going all the way back.

It runs through a main bus cable of about six solid-aluminum wires from the vicinity of the fusebox under the dash, under the carpeting on the floor, through the left front corner of the trunk and down to a connector in the lower-left corner of the trunk, where it connects to a regular stranded-copper wiring harness.

I think the wire you're interested in testing is Tan color; others you should find are Dark Green (right brake/turn), Yellow (left brake/turn), Brown (taillights), Light Green(?) (Backup?) and maybe Orange (constant hot).

Check that the wire has voltage up at the fusebox end, then at every point along the way where you can reach it, including going out through the back of the trunk and into the top of the gas tank. Try unplugging the main harness connector in the lower-left of the trunk and verify that you've got voltage back there when the ignition is on, and see where that leads you.
acg_ssei is offline   Reply With Quote
Old 01-10-2003, 09:13 PM   #10
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Dec 2002
Location: scranton pa
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
1979bonnie is on a distinguished road
Default

Ok thanks Ill try it
1979bonnie is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
crazy gas guage lizzardjoe 1992-1999 11 10-31-2005 06:53 PM
Gas Guage Cutlass442 2000-2005 3 11-28-2004 05:31 PM
Temperature Guage and Oil Guage stuck!!!!! Str8pimpin 1992-1999 4 10-13-2004 05:38 PM
Need help. Compass, gas guage and info center don't work... 1994SSEi Everything Electrical & Electronic 9 06-14-2004 06:06 PM
Gas guage always full.. BUCKMAN 1992-1999 11 05-21-2004 11:58 PM


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



All times are GMT -4. The time now is 09:34 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.