| [GMCnet] LP tank gauge not working [message #310873] |
Thu, 24 November 2016 11:41  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
|
Senior Member |
|
|
The gauge on our 78 Royale hasn't functioned since I got everything back together. Didn't check for function prior to disassembly. Short version. Too much mouse shit to deal with. Wirings checked, and now in a conduit. So what ohms readings should I look for?
Bob Dunahugh
78 Royale.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: [GMCnet] LP tank gauge not working [message #310874 is a reply to message #310873] |
Thu, 24 November 2016 12:00  |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
|
Senior Member |
|
|
I believe all the float rheostats including that propane,gas and water tanks are the standard GM 1970's 90 ohms. If you need to repair or replace the propane gage unit you will haven to run the furnace or other high use appliance for a time to use up the propane in the tank before removing the gage from the tank but you already knew that.
Roy Keen
Minden,NV
76 X Glenbrook
|
|
|
|
| Re: [GMCnet] LP tank gauge not working [message #310875 is a reply to message #310873] |
Thu, 24 November 2016 12:12 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
|
Senior Member |
|
|
HI Bob,
Mine did not work from the time we bought it in 2003. Spent many hours trying to figure out why. Just last summer building my new dashboard, I had to wire in the new dash fuel gauge. Checking the instruction sheet on the new gauge, it has three connections, one from 12v power, another from the tank sending units, and the third is a direct ground. It suddenly occured to me that I did not remember seeing that third wire from the gauge...the ground. Went back to the LP gauge and found it did not have one. Somehow a PO had removed it. I added the ground and 13 yrs later I finally had a working LP gauge. Lesson to be learned.....check the ground connection, which is usually the center of the three posts. HTH
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
|
|
|
|
| Re: [GMCnet] LP tank gauge not working [message #310876 is a reply to message #310873] |
Thu, 24 November 2016 12:15 |
 |
John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
|
Senior Member |
|
|
Is the Tank Grounded properly? Gauge won't work if not. If gauge is pegged on full then no ground. (or wire open) run Temp wire from sender body to good ground to confirm.
if the gauge is pegged on empty then wire is shorted to ground somewhere.
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] LP tank gauge not working [message #310898 is a reply to message #310888] |
Thu, 24 November 2016 22:01 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
|
Senior Member |
|
|
Should be 0-90 ohms as all the sensor are 0-90 from the factory.
JR Wright
> On Nov 24, 2016, at 9:19 PM, Bob Dunahugh wrote:
>
>
> My LP tank has 2 wires to it. A red, and a white. That's the same as our other 78 Royale.
> Bob Dunahugh
>
> ________________________________
> From: Bob Dunahugh
> Sent: Thursday, November 24, 2016 11:41 AM
> To: gmclist@list.gmcnet.org
> Subject: LP tank gauge not working
>
>
> The gauge on our 78 Royale hasn't functioned since I got everything back together. Didn't check for function prior to disassembly. Short version. Too much mouse shit to deal with. Wirings checked, and now in a conduit. So what ohms readings should I look for?
>
> Bob Dunahugh
>
> 78 Royale.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
|
|
|
|
|
|
|
|
| Re: [GMCnet] Fw: LP tank gauge not working [message #310903 is a reply to message #310901] |
Fri, 25 November 2016 07:30 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
|
Senior Member |
|
|
Happy Black Friday. Now, will that 42" smart TV fit?
More seriously, amazing how many problems are related to bad or non-existent grounds. Drive you to using rough language.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
|
|
|
|
| Re: [GMCnet] LP tank gauge not working [message #310904 is a reply to message #310873] |
Fri, 25 November 2016 09:52 |
rjw
Messages: 697
Registered: September 2005
Karma: 4
|
Senior Member |
|
|
BobDunahugh wrote on Thu, 24 November 2016 12:41 The gauge on our 78 Royale hasn't functioned since I got everything back together. Didn't check for function prior to disassembly. Short version. Too much mouse shit to deal with. Wirings checked, and now in a conduit. So what ohms readings should I look for?
Bob Dunahugh
78 Royale.
While this might not apply to your situation, since you have a Royale, my LP gauge never really worked for the first 17 or so years that I had my Palm Beach. The gauge on the tank and the reading on my monitor panel always matched, but the readings had no real correlation to what was in the tank. Once I switched out the tank sender with a known good one someone gave me, still the same. I had always suspected that the sender in the tank was messed up. I was going to use a "GMC Round To-it" someday to remove the tank and have someone open it up and fix or replace the sender. Fortunately, I never got around to doing that job.
About a year ago, while I was fooling around with something unrelated in the LP gas compartment, I happened to notice that the external sender did not look like it was completely seated in the recess on the tank. It looked to be about 1/16" off of being all the way in. It had always looked OK to my untrained eye, but that day I thought about the fact the sender inside the tank and the one outside the tank are magnetically coupled and that perhaps too big of a gap could cause problems. To make it fit better I decided to sand down the circumference of the sender (I had a spare so I was not worried about messing it up) just enough to get it seated all the way. As soon as I pushed it in and hooked up the wires the reading on the gauge went to showing ~80% full (I had just had the tank filled) from the close to empty that had been showing before. For the past year, the gauges consistently match pretty closely to what is actually in the tank.
To think that I went over 17 years without a functioning LP gauge when all along the problem was that the senders on the tank were never seated properly because they were slightly too big around to fit in the tank. It's a good thing I never went to the trouble of taking the tank out and having the internal sender "fixed" or replaced. That sure would have been a waste of time and money.
Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com
Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
