06-27-2011, 07:33 PM | #1 |
Registered User
Join Date: Jan 2007
Location: Garland,TX
Posts: 431
|
fuel gauge help
So after years of having a non-functional fuel gauge I finally decided to do something about it. I knew my sender was shot but when I disconected the brown wire it stayed at the 3 o'clock position. Then I completely removed the wire to check for any shorts, it was good. I then grounded the fuel gauge terminal at the fuse box and it shot back to empty. Also when my tank was near empty the gauge would float all around. Any ideas on what the problem could be??
|
06-27-2011, 07:47 PM | #2 |
Registered User
Join Date: Dec 2009
Location: Ste. Genevieve, MO
Posts: 526
|
Re: fuel gauge help
When its near empty how much does it float around.....does it do it when your going around turn? cuz thats normal.
|
06-27-2011, 08:37 PM | #3 |
Registered User
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
|
Re: fuel gauge help
I just tinkered with mine the other day. I'm convinced mine is related to the sending unit or the little resistor on the back of the gage itself. Addtionally I took a new out of the box (sending float assy) and checked the ohms to compare it to mine. Stamped on the side says 90 OHMS. The new one only reads 80 my old one reads 85 ohms at full with the float to the full swing. When my tank is full it is only showing about half full. The noise of the sloshing of the float could be normal or you could have some extra stuff inside.
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629" |
06-27-2011, 08:53 PM | #4 |
Registered User
Join Date: Jan 2007
Location: Garland,TX
Posts: 431
|
Re: fuel gauge help
it will float during turns and even when sitting at a stop light...what has me stumped is the fact that it stays at the 3 o'clock position even with the sender wire unhooked. thats usually mean theres a short somewhere on the wire but thats not the case.
|
06-27-2011, 10:56 PM | #5 |
Registered User
Join Date: Jan 2011
Location: Redmond, OR
Posts: 759
|
Re: fuel gauge help
Mine did the same - 3 o'clock unless grounded, then went to empty.
Bad sending unit. $30 part and all is good now (thanks to Vettevet's help). Here are the responses I got when I asked the same question. http://67-72chevytrucks.com/vboard/s...l+sending+unit
__________________
68 Chev C20- son has it now 83 K20 - bought from son 70 C20 - in progress |
06-28-2011, 01:14 AM | #6 |
Registered User
Join Date: Jan 2007
Location: Garland,TX
Posts: 431
|
Re: fuel gauge help
thanks for the reply dmack, i wish i had come across your thread when i was searching different post. lots of good info there. im going to check for the fuel tank ground tomorrow.
|
06-28-2011, 12:21 PM | #7 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
|
Re: fuel gauge help
my fuel gauge didn't work ever since I installed m new fuel cell (2 years) as I was getting ready to cut a big hole in my tank and modify a factory sender I noticed the new aftermarket sender had a loose wire inside the tank. Gotta love paying top dollar for professional work.
__________________
67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
06-28-2011, 03:38 PM | #8 |
Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
|
Re: fuel gauge help
Here is a guide I used when I was working on the sending unit in my 69 GMC.
http://www.6066gmcguy.org/Electrical-02.htm
__________________
Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is! |
06-28-2011, 07:33 PM | #9 |
Who's got steelies?
Join Date: Feb 2006
Location: Morrison, Oklahoma
Posts: 1,026
|
Re: fuel gauge help
That is kind of normal for it to go towards 3 o'clock position with sender wire unhooked. If the sender wire shorted out (shorted to ground), it would read empty. Either your sender is bad, or the sender wire has a bad spot somewhere.
__________________
1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|