Gas Gauge Problem Fixed!!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jorgensensc · 12-01-2003, 12:55 AM

I found a solution to my gas gaue problem!!! My gas gauge was reading way off after I painted the green part white (it worked right before). When I put the gauges back together I put the resistor on, then washers and nuts, then the circuit card, then washers and nuts. That was the problem!! When I ohmed out the posts (with the gauges setup), they came back at approx 45. When I ohmed the gauge out by itself I got approx. 87. When I ohmed out the resistor I got approx. 87. When I put them together I got Approx. 87. When I screwed down the resistor I got approx 87. then I added the circuit card and screwed it down and got approx 45 again. I took off the nuts and then took the nuts off of the resistor and put the circuit card directly on the resistor. Then I bolted it down. This ohmed out at approx. 87!!! I installed the gauge and it went right to the correct level!!!! Turns out the extra nuts and washers were causing more impedence. Weird!! Hope this helps someone else!!!
Shawn

Longhorn Man · 12-01-2003, 01:52 AM

I shoulda thought of this since I had the same issue after doing one years ago.

jorgensensc · 12-01-2003, 02:22 AM

It was really a shot in the dark, but it worked!!!

Hooter · 12-01-2003, 02:28 AM

That just shows ya how sensitive these things are, glad you got it fixed, now you can see how bad your truck is on gas now

A.P. · 12-01-2003, 04:56 AM

Good job jorgensensc.

70c10 · 12-01-2003, 09:21 AM

Thanks for sharing that info.

**1970 CST Short Wide** · 12-01-2003, 12:51 PM

I will have to try that, My gauge jumps from 1/2 to 3/4. I changed the sending unit and the resistor and it still jumps. I still think I have a ground problem buy this is one more thing to try THANKS

ChevLoRay · 12-01-2003, 01:27 PM

I remember in my Basic Electronics courses at Keesler AFB, waaaaay back in the "brown shoe days" that resisters in parallel have less resistance than they do in series. I always thought that was odd, but they simply limit the current. Since electricity always takes the path of least resistance, parallel resisters offer two paths for current.

This may not have had anything to do with your situation, but you mentioned resistance readings and what you did affected the resistance values you were checking.

12-01-2003, 12:55 AM	#1
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Gas Gauge Problem Fixed!!!! I found a solution to my gas gaue problem!!! My gas gauge was reading way off after I painted the green part white (it worked right before). When I put the gauges back together I put the resistor on, then washers and nuts, then the circuit card, then washers and nuts. That was the problem!! When I ohmed out the posts (with the gauges setup), they came back at approx 45. When I ohmed the gauge out by itself I got approx. 87. When I ohmed out the resistor I got approx. 87. When I put them together I got Approx. 87. When I screwed down the resistor I got approx 87. then I added the circuit card and screwed it down and got approx 45 again. I took off the nuts and then took the nuts off of the resistor and put the circuit card directly on the resistor. Then I bolted it down. This ohmed out at approx. 87!!! I installed the gauge and it went right to the correct level!!!! Turns out the extra nuts and washers were causing more impedence. Weird!! Hope this helps someone else!!! Shawn __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

12-01-2003, 02:22 AM	#3
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	It was really a shot in the dark, but it worked!!! __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

12-01-2003, 02:28 AM	#4
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,083	That just shows ya how sensitive these things are, glad you got it fixed, now you can see how bad your truck is on gas now __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

12-01-2003, 04:56 AM	#5
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Good job jorgensensc. __________________ 72 Chevy, SWB, 350engine, TH400

12-01-2003, 09:21 AM	#6
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Thanks for sharing that info. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

12-01-2003, 01:52 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	I shoulda thought of this since I had the same issue after doing one years ago.

12-01-2003, 12:51 PM	#7
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,101	I will have to try that, My gauge jumps from 1/2 to 3/4. I changed the sending unit and the resistor and it still jumps. I still think I have a ground problem buy this is one more thing to try THANKS __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

12-01-2003, 01:27 PM	#8
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Electronics does weird stuff.... I remember in my Basic Electronics courses at Keesler AFB, waaaaay back in the "brown shoe days" that resisters in parallel have less resistance than they do in series. I always thought that was odd, but they simply limit the current. Since electricity always takes the path of least resistance, parallel resisters offer two paths for current. This may not have had anything to do with your situation, but you mentioned resistance readings and what you did affected the resistance values you were checking. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.



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