GM Truck Fuel Gauge & Sending Unit Troubleshooting 1967-1987

Just a short easy to follow tutorial on how to test and diagnose your 67-72 Chevy GMC truck or 73-87 Squarebody, using a battery, test probe and a multimeter.

[@Ben-wg6uf]

adding the systematic approach at the end was a great help , thanks man!

[@American-OutdoorsNet]

Thanks for tuning in!

[@angelanglin453]

Fantastic demonstration

[@American-OutdoorsNet]

Thanks for tuning in!

[@chuyjr]

Excellent explanation friend. It helped me a lot with my problem with my dashboard, since the gasoline does not indicate in my 1987 Chevrolet K10. a big greeting. from Nuevo Laredo Tamaulipas Mexico

[@American-OutdoorsNet]

Glad I could help!

[@Drakes_Garage]

Every word spoken was information. Great information. No more, no less. Thank you. Easy to follow along.

[@American-OutdoorsNet]

Thanks for tuning in.

[@BiblesandC10s]

Good afternoon, sir. Let me tell you. I’ve been searching for a video like this for hours. You are very clear concise and it was. This was an amazing troubleshooting tutorial. I think you again I’m going tackle this today.

[@American-OutdoorsNet]

Thank you.

[@richardcranium5048]

I concur

[@loboloco866]

Excellent review thanks a lot

[@raymondshadrick9507]

You laid it and made it simple , happy with your video

[@American-OutdoorsNet]

Glad to have helped and thanks for tuning in.

[@chrisnock1151]

This was very helpful

[@eliasdeleon9424]

Great info. Thanks for the video

[@American-OutdoorsNet]

Thanks for tuning in.

[@sbteam1332]

What a great video A+++

[@American-OutdoorsNet]

Thanks for watching!

[@Reaglesracing44_]

on my 75 suburban the fuel gauge is reading at 3pm spot with key on or running. shut off it reads half on full tank. also tried another gauge with same reading

[@borntobewild846]

Great info and teaching style

[@89ba20]

wonderful video, any chance you could do a set up with a duel tank setup? switch, etc, and how to trouble shoot that?

[@American-OutdoorsNet]

Yes, I can't say when, but we may follow up with a dual tank troubleshooting guide.

[@richardcranium5048]

Jet Lag by Nazareth is a great song.... We do thing a different way back in the USA

[@edwardanaya7577]

Hello, I have a 79 Chevy and was wondering where the tank selector switch connects? Mine was unplugged during the column replacement, thanks for your help!!

[@lester7873]

does that apply to duel tanks caboth tanks give no reading use

[@American-OutdoorsNet]

The principals are the same but with a solenoid and switch for two trailing circuits.

[@robertdelao957]

Good afternoon,One Question. Where do I ground the fuel gauge from the back of the gauge , and how and Where? Paying attention to your video. Getting a Ground wire and attach to the ground gauge prong and then to the dash. correct? please advised Thank you Robert

[@marksanders1942]

Ok. You said leave comments and questions…so here. Goes. I have a 76 Chevrolet truck and there is no wire to the sending unit. Under the truck is a damaged white wire. Is that wire the sending unit wire? I have done no test yet but will. Thanks Mark

[@American-OutdoorsNet]

The wire to the sending unit is not white. Go to the bulkhead connector and look for a pink or tan wire. It originally ran from there behind the engine, down past the starter, down along the passenger side frame rail. It is likely cut somewhere along that path and may be buried inside wiring conduit.

[@marksanders1942]

@@American-OutdoorsNet thank you very much. I did forget to mention that this was originally a dual tank truck. Does that change anything? I am putting it back as only one tank I have not found the wire but will look again. Thank you very much

[@BiblesandC10s]

Hello sir what if my gas gauge goes full circle and goes past full does any keep that is bad? As soon as I touch the power to the Gas gauge it rapidly goes in a circle and goes pass full

[@shiminowind]

Why did you hook the two sending units up differently on the grounds? 1st was connected from the battery to the SU directly with a second test clip from the gauge to the SU 2nd SU battery ground was hooked up directly to the gauge with a second clip connected to the gauge ground going to the sending unit. Same results just curious. I came to the conclusion it was a ground on my project before I decided to do a search and found this video. You confirmed my diagnosis thank you for the info. I just haven't gone to the sending units directly to figure out my issue. I have dual tanks on my project and neither show on the gauge. When I switch the tanks the gauge moves slightly so I know I'm getting a resistance change and the gauge fuse has 88-89 ohms so I know it's good. I got power to the gauge and I have a good ground but no signal whatsoever. I'll be back at it today to narrow it down further. Any feedback would be greatly appreciated. Should I blame the switch? Or move on

[@American-OutdoorsNet]

Just showing multiple ways for testing. As for diagnosis, without specifics on the year and history I can't say much more, other than to focus on the basics ie ground, sending units, etc.

[@shiminowind]

@@American-OutdoorsNet My project is a 79 Chevy 3/4 ton custom deluxe same setup here and wired the same. I mentioned the switch cause I was wondering if the switch could give a false condition in which the gauge doesn't indicate a ground at the SU cause of the 3 o'clock position even if everything is as it should be and working properly in the circuit. In other words the switch is working but can a loss in resistance an the switch drop the circuit and read at 3 o'clock but still give good ground a power connection throughout and not alow the gauge to function normally. History is unknown as it's a project and was bought as is. I've fixed over 80% of the electrical already, alot of shorts to ground and bad wiring. It runs amazing with the 327 sb camaro engine and gets fuel to the carb just fine. Doesn't stall at all. And never has had any fuel related problems. It's an electrical issue

[@BUY_YOUTUB_VIEWS_e0e108]

added to my playlist.