Here is the 1000th question.. Sorry! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

b00sted · 05-28-2008, 07:28 PM

Well not really but it sure does seem like it..

My fuel gauge in my truck always reads full... I was about to buy a new sending unit but was thinking if it went bad it would be an empty reading?

I don't mind spending the money to get one but just would like some idea on what to look for.. Gauge? Sending unit or? This is the stock location tank, with stock dash and gauge...

poncho_villa · 05-29-2008, 12:28 AM

Try this link
http://www.6066gmcguy.org/Electrical-02.htm
Should help narrow the problem down.

b00sted · 05-29-2008, 04:42 AM

I read that and I am a bit confused... My gauge goes straight to the full mark when the key is on.. I am assuming that I have a bad ground.... Am I correct saying this?

poncho_villa · 05-29-2008, 06:00 AM

I am assuming that your tank is still behind your seat and you can get easy access to it by flipping the seat forward and pulling the cover back to expose the wiring and sender unit. You can disconnect and reconnect the wires while watching the guage with the key on. Process of elimination. But yes, my guess is it's a grounding issue. Just can't remember what it takes to peg the guage to full. Good luck and let us know the outcome.

b00sted · 05-29-2008, 01:17 PM

Will do and thanks for your help... And yes everything is still in the factory location on my truck...

DavesRide · 05-30-2008, 01:51 AM

Quote:

Originally Posted by b00sted

I read that and I am a bit confused... My gauge goes straight to the full mark when the key is on.. I am assuming that I have a bad ground.... Am I correct saying this?

Having just read that article and my experience with sending units, I would say that you should pursue this first. I can't remember the last time I replaced a gauge. Poor or missing grounds will create all kinds of strange problems. That test you did with key on and full gauge is exactly like in descrition. Check out those wires and terminals and let us know. Dave

b00sted · 05-30-2008, 01:24 PM

I went out and looked at my sending unit in my tank. There is one stud for a wire and one screwed into the tank..

As mine is hooked up now it has the ground coming from the direct screw in and the power to the stud.. Is this backwards?

cadman89 · 05-30-2008, 10:30 PM

Mine looks like this:

If you disconnect the power lead it should go to empty.

Cadman

b00sted · 05-31-2008, 03:45 AM

Mine goes ot fulla s soon as the key is on... Take th epower wire off and it is still at full..

Her eis mine.. Not nearly as clean as yours..

The yellow wire is just an added ground that I did testing it..

poncho_villa · 05-31-2008, 05:55 AM

Could be the sending unit is toast. It looks older than God. You can remove it for further testing, but be careful. Don't want to make the rest of the truck toast.

b00sted · 05-31-2008, 01:16 PM

I went ahead and ordered a new sending unit from Classic Parts.. I will have it in here on Monday

Thanks fo rthe help...

b00sted · 06-03-2008, 01:46 PM

Was the sending unit.. Had about 2" of the positive wire gone from inside the tank...

poncho_villa · 06-03-2008, 10:17 PM

Ain't it great to have those kind of issues done and over with?!? Glad to hear the mystery is solved.......but there is always something else.

b00sted · 06-04-2008, 06:43 AM

Isn't that the truth.. Going to charge the a/c this weekend... I wonder what i will find next...LOL

05-28-2008, 07:28 PM	#1
b00sted Registered User Join Date: May 2008 Location: Midland GA Posts: 332	Here is the 1000th question.. Sorry! Well not really but it sure does seem like it.. My fuel gauge in my truck always reads full... I was about to buy a new sending unit but was thinking if it went bad it would be an empty reading? I don't mind spending the money to get one but just would like some idea on what to look for.. Gauge? Sending unit or? This is the stock location tank, with stock dash and gauge... __________________ 1949 Chevy 408 CID stroker 6.0l with a few add ons, 4l80E, 4 Wheel Disk Brakes and a set of GT35 going on soon.

05-29-2008, 12:28 AM	#2
poncho_villa Registered User Join Date: Feb 2005 Location: B.C. Posts: 457	Re: Here is the 1000th question.. Sorry! Try this link http://www.6066gmcguy.org/Electrical-02.htm Should help narrow the problem down. __________________ 58 Apache short fleetside ona 64 chassis:

05-29-2008, 04:42 AM	#3
b00sted Registered User Join Date: May 2008 Location: Midland GA Posts: 332	Re: Here is the 1000th question.. Sorry! I read that and I am a bit confused... My gauge goes straight to the full mark when the key is on.. I am assuming that I have a bad ground.... Am I correct saying this? __________________ 1949 Chevy 408 CID stroker 6.0l with a few add ons, 4l80E, 4 Wheel Disk Brakes and a set of GT35 going on soon.

05-29-2008, 06:00 AM	#4
poncho_villa Registered User Join Date: Feb 2005 Location: B.C. Posts: 457	Re: Here is the 1000th question.. Sorry! I am assuming that your tank is still behind your seat and you can get easy access to it by flipping the seat forward and pulling the cover back to expose the wiring and sender unit. You can disconnect and reconnect the wires while watching the guage with the key on. Process of elimination. But yes, my guess is it's a grounding issue. Just can't remember what it takes to peg the guage to full. Good luck and let us know the outcome. __________________ 58 Apache short fleetside ona 64 chassis:

05-29-2008, 01:17 PM	#5
b00sted Registered User Join Date: May 2008 Location: Midland GA Posts: 332	Re: Here is the 1000th question.. Sorry! Will do and thanks for your help... And yes everything is still in the factory location on my truck... __________________ 1949 Chevy 408 CID stroker 6.0l with a few add ons, 4l80E, 4 Wheel Disk Brakes and a set of GT35 going on soon.

05-30-2008, 01:24 PM	#7
b00sted Registered User Join Date: May 2008 Location: Midland GA Posts: 332	Re: Here is the 1000th question.. Sorry! I went out and looked at my sending unit in my tank. There is one stud for a wire and one screwed into the tank.. As mine is hooked up now it has the ground coming from the direct screw in and the power to the stud.. Is this backwards? __________________ 1949 Chevy 408 CID stroker 6.0l with a few add ons, 4l80E, 4 Wheel Disk Brakes and a set of GT35 going on soon.

05-30-2008, 10:30 PM	#8
cadman89 Registered User Join Date: Sep 2004 Location: Jacksonville, FL Posts: 265	Re: Here is the 1000th question.. Sorry! Mine looks like this: If you disconnect the power lead it should go to empty. Cadman __________________ 56 GMC 1922 Dodge Rat Roadster 89 Gray Allante 90 Red Allante Turkey Run Photographer http://www.turkeyrun.com/photo_gallery.html Last edited by cadman89; 05-30-2008 at 10:31 PM.

05-31-2008, 03:45 AM	#9
b00sted Registered User Join Date: May 2008 Location: Midland GA Posts: 332	Re: Here is the 1000th question.. Sorry! Mine goes ot fulla s soon as the key is on... Take th epower wire off and it is still at full.. Her eis mine.. Not nearly as clean as yours.. The yellow wire is just an added ground that I did testing it.. __________________ 1949 Chevy 408 CID stroker 6.0l with a few add ons, 4l80E, 4 Wheel Disk Brakes and a set of GT35 going on soon.

05-31-2008, 05:55 AM	#10
poncho_villa Registered User Join Date: Feb 2005 Location: B.C. Posts: 457	Re: Here is the 1000th question.. Sorry! Could be the sending unit is toast. It looks older than God. You can remove it for further testing, but be careful. Don't want to make the rest of the truck toast. __________________ 58 Apache short fleetside ona 64 chassis:

05-31-2008, 01:16 PM	#11
b00sted Registered User Join Date: May 2008 Location: Midland GA Posts: 332	Re: Here is the 1000th question.. Sorry! I went ahead and ordered a new sending unit from Classic Parts.. I will have it in here on Monday Thanks fo rthe help... __________________ 1949 Chevy 408 CID stroker 6.0l with a few add ons, 4l80E, 4 Wheel Disk Brakes and a set of GT35 going on soon.

06-03-2008, 01:46 PM	#12
b00sted Registered User Join Date: May 2008 Location: Midland GA Posts: 332	Re: Here is the 1000th question.. Sorry! Was the sending unit.. Had about 2" of the positive wire gone from inside the tank... __________________ 1949 Chevy 408 CID stroker 6.0l with a few add ons, 4l80E, 4 Wheel Disk Brakes and a set of GT35 going on soon.

06-03-2008, 10:17 PM	#13
poncho_villa Registered User Join Date: Feb 2005 Location: B.C. Posts: 457	Re: Here is the 1000th question.. Sorry! Ain't it great to have those kind of issues done and over with?!? Glad to hear the mystery is solved.......but there is always something else. __________________ 58 Apache short fleetside ona 64 chassis:

06-04-2008, 06:43 AM	#14
b00sted Registered User Join Date: May 2008 Location: Midland GA Posts: 332	Re: Here is the 1000th question.. Sorry! Isn't that the truth.. Going to charge the a/c this weekend... I wonder what i will find next...LOL __________________ 1949 Chevy 408 CID stroker 6.0l with a few add ons, 4l80E, 4 Wheel Disk Brakes and a set of GT35 going on soon.

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