|
12-29-2013, 12:12 AM
|
#1 |
|
Registered User
Join Date: Apr 2011
Location: Keyser WV
Posts: 246
|
Fuel guage problem
91 Topkick
having problems with the fuel gauge not working. Gauge is at full. cant seem to remember if that means it is shorted to ground or broken wire. Seem to remember it being shorted to ground was buried above full and broken wire was below empty. Doesn't make sense to me for it to be exactly on full mark with the sending unit unhooked. Anyone have some input? And/or a wire diagram for it? |
|
|
|
12-29-2013, 10:20 AM
|
#2 |
|
Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
|
Re: Fuel guage problem
That should be a short to ground.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
|
|
|
|
12-29-2013, 11:24 AM
|
#3 |
|
Registered User
Join Date: Apr 2011
Location: Keyser WV
Posts: 246
|
Re: Fuel guage problem
I was thinking short was towards full, but I always thought a short pushed it way past full. And this one is dead on the full mark. Never seen this problem on newer body style, all of my experience is with 87 back pickups.
|
|
|
|
|
12-29-2013, 11:30 AM
|
#4 |
|
Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
|
Re: Fuel guage problem
If the wire to the fuel sending unit is unplugged, the fuel gauge should read over the full mark.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
|
|
|
|
12-29-2013, 04:09 PM
|
#5 |
|
Registered User
Join Date: Apr 2011
Location: Keyser WV
Posts: 246
|
Re: Fuel guage problem
So then a corroded wire makes more sense, found many of these on headlight harness and some of the combination switch wires. Truck was a NJ plow truck and salt spreader so it has seen above average winter use.
|
|
|
|
|
12-29-2013, 11:26 PM
|
#6 |
|
Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
|
Re: Fuel guage problem
We used to have suburbans come in where the baffle would come lose inside the tank and hold the float up. They would be towed in, out of gas, but the owners thought they had fuel in the tank.
Salt and other chemicals are used here too. So much is on the road in areas now that it leaves a cloud of dust behind vehicles from the pulverized salt on the road. The roads aren’t white with snow, they are white with salt. We are double digits sub zero now, and the salt does not melt anything when it is this cold.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
|
|
|
|
12-30-2013, 12:08 AM
|
#7 |
|
Registered User
Join Date: Apr 2011
Location: Keyser WV
Posts: 246
|
Re: Fuel guage problem
As of now the gauge doesn't move. Sending unit is unhooked and stays the same unhooked or shorted to ground, So it looks like I'm looking for a broken wire or terminal instead of a shorted wire. Already tested at the weather pck connector at battery box and no change. Only other connector I can find is inside of cab on the firewall. That's where a wire diagram would be great. Wire harness is nothing like the pickups harness. I have a few extras to add I pulled from a pickup and there is no where to hook them up on the med duty harness.
|
|
|
|
|
12-30-2013, 10:34 AM
|
#8 |
|
Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
|
Re: Fuel guage problem
I would do some testing right at the gauge.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
|
|
|
|
12-30-2013, 12:57 PM
|
#9 |
|
Registered User
Join Date: Oct 2007
Location: pittston,PA
Posts: 1,184
|
Re: Fuel guage problem
I have a complete cluster you could have if you want. just cover shipping. it was out of an 89 k1500. if this helps you.
__________________
There is nothing you can't fix with a BFH or a FIRE WRENCH. 1997 chevy k1500 ext cab z71 (daily driver) sold 1996 chevy k1500 reg cab 4x4(daily driver)totaled 2008jeep patriot (wife's daily driver 2008 chevy 1500 ext cab 4x4 sold 2011 chevy 1500 crew cab ltz (daily driver) 1996 chevy 1500 reg cab 4x4 project sold 2006 pontiac grand prix gxp (daily work commuter) |
|
|
|
|
12-30-2013, 06:40 PM
|
#10 |
|
Registered User
Join Date: Apr 2011
Location: Keyser WV
Posts: 246
|
Re: Fuel guage problem
Offer is appreciated, but mine is a Topkick and uses a completely different cluster. It has needle type gauges and air brakes.
Last edited by jmlloar; 12-30-2013 at 06:48 PM. |
|
|
|
|
12-30-2013, 07:22 PM
|
#11 |
|
Registered User
Join Date: Jun 2012
Location: melbourne, victoria
Posts: 145
|
Re: Fuel guage problem
you might have to invest in a repair manual
something like this off ebay(i know yours is diesel tho) http://www.ebay.com/itm/1992-Chevrol...d71a78&vxp=mtr actually this one is prob better http://www.ebay.com/itm/1991-GMC-Top...2216ff&vxp=mtr this one actually has a diesel supplement, but its a 90 http://www.ebay.com/itm/1990-GMC-Top...27b7cb&vxp=mtr
__________________
1988 GMC c1500 SWB D/D RHD 5.7L 700R4 Last edited by burkey05; 12-30-2013 at 07:32 PM. Reason: new info |
|
|
|
|
12-30-2013, 08:01 PM
|
#12 | |
|
Registered User
Join Date: Apr 2011
Location: Keyser WV
Posts: 246
|
Re: Fuel guage problem
Quote:
|
|
|
|
|
|
12-30-2013, 11:55 PM
|
#13 |
|
Registered User
Join Date: Oct 2007
Location: pittston,PA
Posts: 1,184
|
Re: Fuel guage problem
well I tried. good luck tracking the problem down.
__________________
There is nothing you can't fix with a BFH or a FIRE WRENCH. 1997 chevy k1500 ext cab z71 (daily driver) sold 1996 chevy k1500 reg cab 4x4(daily driver)totaled 2008jeep patriot (wife's daily driver 2008 chevy 1500 ext cab 4x4 sold 2011 chevy 1500 crew cab ltz (daily driver) 1996 chevy 1500 reg cab 4x4 project sold 2006 pontiac grand prix gxp (daily work commuter) |
|
|
|
|
12-31-2013, 09:42 AM
|
#14 |
|
Registered User
Join Date: Dec 2013
Location: Jackson,tn
Posts: 70
|
Re: Fuel guage problem
If the needle isnt "past full" its also possible the float in the tank is hung/stuck. A rubber mallet and a half a tank or less "may" fix that, allowing it to settle.
The float arms can also pinch on the pump hanger, causing same problem. As u check to see if the connections are good, take a mallet /w/ you. Also could be "pig tail" |
|
|
|
|
12-31-2013, 10:20 AM
|
#15 |
|
here, just not logged in
Join Date: Nov 2007
Location: Tx
Posts: 1,011
|
Re: Fuel guage problem
Is a Topkick a 4500? I have most wire/d up to the 3500s. There haynes style but if any will help ill post what you want.
|
|
|
|
|
12-31-2013, 08:07 PM
|
#16 | |
|
Registered User
Join Date: Apr 2011
Location: Keyser WV
Posts: 246
|
Re: Fuel guage problem
Quote:
|
|
|
|
|
|
12-31-2013, 08:10 PM
|
#17 | |
|
Registered User
Join Date: Apr 2011
Location: Keyser WV
Posts: 246
|
Re: Fuel guage problem
Quote:
|
|
|
|
|
 |
| Bookmarks |
|
|
Linear Mode
