Fuel guage problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Gyva · 03-11-2005, 02:37 AM

My fuel guage does not move anymore. It has found its resting place past the full mark, it hangs out at about the 2 or 3 o'clock position and just sits there. I know I need a new fuel sending unit in my gas tank but why did my needle go completly out of the e to f range? thanks for any help, and where do you recomend I get an aftermarket fuel sending unit

Mike...

Alexis · 03-11-2005, 02:41 AM

check your connection on the fuse box..........it should be a brown wire if memory serves me right, it is just a female connector that conects to the fuse box......it comes out sometimes. If it isn't that then well move onto the next thing, sending unit or the wiring to the gauge.

goodluck, i know other will give other ideas.

HatGuy · 03-11-2005, 04:05 AM

While we are on the subject. My gauge works
but wiggles back and forth about a half inch
even when it is sitting still. Do I need a new
sending unit ?

HillBilly2357 · 03-11-2005, 06:21 AM

I've got gremlins in my fuel gauge too (in my 3/4 ton). But mine jumps from normal to way past full (about 3 or 4 o'clock), stays there for a few seconds, then falls back to normal. It does this continuously.

ssls6 · 03-11-2005, 11:49 AM

If your gauge goes way past full, then you probably have an open circuit between the sending unit and the gauge. Check that the brown wire from the tank is connected (both at the tank and at the fuse box). If the brown wire is OK (test at the fuse box with a multimeter 90 ohms is full, 0 ohms is empty) then the open could be in the printed circuit harness.

typical fault tree

needle way past full.....
open circuit between sending unit and dash
sending unit is bad

needle stays on empty...
short between sending unit and dash
leak in sending unit float

needle works but only between 1/4 and empty
82 ohm ballast resistor behind gauge is bad

needle bounces around
bad gauge

Use a multimeter when in doubt.

71jimmy · 03-11-2005, 01:13 PM

Nice troubleshooting steps ssls6. Any idea if you can fix the bad guage that bounces? What part in the guage would cause it to bounce?

I just replaced my tank, sending unit etc and filled up for the first time and I got the bouncy gauge syndrome.

HatGuy · 03-12-2005, 02:10 AM

Thanks ssls6,
The trouble shooting guide is great!
Looks like I'll be shoping for a new gauge.

LUV2XCLR8 · 03-12-2005, 08:00 AM

HMMMM, BRAND NEW SENDING UNIT HERE, READS EMPTY, SOUNDS
LIKE THE FLOAT ON MINE MAY HAVE SANK / GOT A LEAK IN IT.

FRENCHBLUE72 · 03-12-2005, 05:19 PM

Nice trouble shootin guide hope fully it will help me on mine bad guage...

Gyva · 03-13-2005, 07:44 PM

Luv2xclr8: or maybe you got a short according to the trouble shooting guide above...

Mike

LUV2XCLR8 · 03-13-2005, 07:46 PM

Quote:

Originally Posted by Gyva

Luv2xclr8: or maybe you got a short according to the trouble shooting guide above...

Mike

WE CHECKED IT, MIGHT HAVE MISSED IT, BUT IT LOOKS AS IF IT'S THE FLOAT

03-11-2005, 02:37 AM	#1
Gyva Registered User Join Date: Jan 2005 Location: Mountain Home Idaho Posts: 544	Fuel guage problems My fuel guage does not move anymore. It has found its resting place past the full mark, it hangs out at about the 2 or 3 o'clock position and just sits there. I know I need a new fuel sending unit in my gas tank but why did my needle go completly out of the e to f range? thanks for any help, and where do you recomend I get an aftermarket fuel sending unit Mike...

03-11-2005, 04:05 AM	#3
HatGuy Registered User Join Date: Aug 2003 Location: Fort Worth Texas Posts: 275	While we are on the subject. My gauge works but wiggles back and forth about a half inch even when it is sitting still. Do I need a new sending unit ? __________________ Joe Peters the HatGuy 72' K5 Highlander My Daily Driver http://www.pbhats.com/BLAZER/index.html

03-11-2005, 06:21 AM	#4
HillBilly2357 Registered User Join Date: Dec 2004 Location: Paris TX Posts: 7	I've got gremlins in my fuel gauge too (in my 3/4 ton). But mine jumps from normal to way past full (about 3 or 4 o'clock), stays there for a few seconds, then falls back to normal. It does this continuously. __________________ 72 GMC Jimmy 72 GMC 3/4 ton Camper Special 70 Chevy 3/4 ton (in pieces) FOR SALE!

03-11-2005, 01:13 PM	#6
71jimmy Registered User Join Date: Mar 2004 Location: Sacramento, CA Posts: 1,083	Nice troubleshooting steps ssls6. Any idea if you can fix the bad guage that bounces? What part in the guage would cause it to bounce? I just replaced my tank, sending unit etc and filled up for the first time and I got the bouncy gauge syndrome. __________________ '71 Jimmy, 350, SM465, NP205, 2in Tuff Country lift, 33s on rallies, TBI, softtop and hardtop "If life was fair you'd be able to afford one of each and a garage large enough to house them all."

03-12-2005, 02:10 AM	#7
HatGuy Registered User Join Date: Aug 2003 Location: Fort Worth Texas Posts: 275	Thanks ssls6, The trouble shooting guide is great! Looks like I'll be shoping for a new gauge. __________________ Joe Peters the HatGuy 72' K5 Highlander My Daily Driver http://www.pbhats.com/BLAZER/index.html

03-11-2005, 02:41 AM	#2
Alexis Member since 2000 Join Date: Dec 2000 Location: Mountain View Ca / Mexico Posts: 7,874	check your connection on the fuse box..........it should be a brown wire if memory serves me right, it is just a female connector that conects to the fuse box......it comes out sometimes. If it isn't that then well move onto the next thing, sending unit or the wiring to the gauge. goodluck, i know other will give other ideas.

03-11-2005, 11:49 AM	#5
ssls6 Registered User Join Date: Jan 2005 Posts: 21	If your gauge goes way past full, then you probably have an open circuit between the sending unit and the gauge. Check that the brown wire from the tank is connected (both at the tank and at the fuse box). If the brown wire is OK (test at the fuse box with a multimeter 90 ohms is full, 0 ohms is empty) then the open could be in the printed circuit harness. typical fault tree needle way past full..... open circuit between sending unit and dash sending unit is bad needle stays on empty... short between sending unit and dash leak in sending unit float needle works but only between 1/4 and empty 82 ohm ballast resistor behind gauge is bad needle bounces around bad gauge Use a multimeter when in doubt.

03-12-2005, 08:00 AM	#8
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	HMMMM, BRAND NEW SENDING UNIT HERE, READS EMPTY, SOUNDS LIKE THE FLOAT ON MINE MAY HAVE SANK / GOT A LEAK IN IT. __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

03-12-2005, 05:19 PM	#9
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	Nice trouble shootin guide hope fully it will help me on mine bad guage... __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

03-13-2005, 07:44 PM	#10
Gyva Registered User Join Date: Jan 2005 Location: Mountain Home Idaho Posts: 544	Luv2xclr8: or maybe you got a short according to the trouble shooting guide above... Mike

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