Fuel Gauge issue

phatnogin5877 · 08-02-2009, 09:58 PM

2000 S10 Blazer, 4DR, 4X4. Fuel Gauge is always on Empty and Fuel light is always on. So I read through the forums and discovered that the fuel level sending unit is a common problem on this model. Of course the sending unit is part of the pump assembly. So today I dropped the tank and installed a new pump assembley complete with sending unit. put it all back together, filled up with fuel and.....NOTHING! Gauge is still on E nd fuel light is still on.

Any suggestions? After all I have read it is highly unlikely that the gauge itself is bad (but possible). How should I test.

raviolli · 08-03-2009, 12:48 AM

i just use my trip odo as a fuel gauge. its a bit cheaper than dropping the tank. though i do get the occasional headache of someone borrowing my truck and running out of gas without the slightest clue as to why when the fuel gauge says full

dragnby · 08-03-2009, 02:05 AM

i will be replacing my assembly here soon bc my gauge says empty and sometimes its right and sometimes it say anything else lol

Calvin51 · 08-04-2009, 08:30 PM

Just swapped mine out on my 2000 Jimmy. $331 from AutoZone. When you swapped yours did you get the updated witing harness with it? It may or may not have anything to do with it. But if you did change it out it could be one of the wire are not making good contact.

So Low Roller · 08-04-2009, 08:36 PM

something isnt getting a signal / connection, i would check fuse's and grounds.

phatnogin5877 · 08-08-2009, 07:02 PM

Quote: Originally Posted by Calvin51

Just swapped mine out on my 2000 Jimmy. $331 from AutoZone. When you swapped yours did you get the updated witing harness with it? It may or may not have anything to do with it. But if you did change it out it could be one of the wire are not making good contact.

No I bought an AC DELCO from ebay. Its a genuine exact replacement (Yes its new) but it did not come with any other wiring harness.

I did a little trouble shooting. I pulled the instrument cluster out and if I ground pin#1 of the fuel guage it goes to full (Low fuel light does not go out). This tells me the guage is most likely working but there is an open circuit. Im not sure if the fuel light should go out when I grond it or not. Here is the odd part I have a wiring diagram that says the wire from the sending unit is purple and goes directly to the guage. There are NO purple wires in the harness that connects to the cluster. Also when I test for continuity from the guage to the pins on the harness I get no continuity, the path stops at a little circuit board that I cant remove. Is it possible something in this little board is my problem?

So to help me troubleshoot a little more does anyone know the actual color of the fuel level sending wire that goes into the instrument cluster? Its not purple!

any other thoughts or suggestions are much appreciated.

generics10 · 08-23-2009, 03:37 PM

Ive got the same problem... And my oil pressure gage is doing the same thing... I think its in the bcm, cluster or the connections.

08-02-2009, 09:58 PM	#1
phatnogin5877 Registered User Age: 31 Join Date: Aug 2009 Posts: 3 Location: User is: OffLine	Fuel Gauge issue 2000 S10 Blazer, 4DR, 4X4. Fuel Gauge is always on Empty and Fuel light is always on. So I read through the forums and discovered that the fuel level sending unit is a common problem on this model. Of course the sending unit is part of the pump assembly. So today I dropped the tank and installed a new pump assembley complete with sending unit. put it all back together, filled up with fuel and.....NOTHING! Gauge is still on E nd fuel light is still on. Any suggestions? After all I have read it is highly unlikely that the gauge itself is bad (but possible). How should I test.
	[Reply w/Quote]

08-03-2009, 12:48 AM	#2
raviolli raviolli Age: 19 Join Date: Jul 2009 Posts: 34 Location: Titusville, FL User is: OffLine	Re: Fuel Gauge issue i just use my trip odo as a fuel gauge. its a bit cheaper than dropping the tank. though i do get the occasional headache of someone borrowing my truck and running out of gas without the slightest clue as to why when the fuel gauge says full
	[Reply w/Quote]

08-03-2009, 02:05 AM	#3
dragnby Registered User Age: 19 Join Date: Jul 2009 Posts: 8 Location: User is: Online	Re: Fuel Gauge issue i will be replacing my assembly here soon bc my gauge says empty and sometimes its right and sometimes it say anything else lol
	[Reply w/Quote]

08-04-2009, 08:30 PM	#4
Calvin51 Registered User Join Date: Dec 2007 Posts: 167 Location: User is: OffLine	Re: Fuel Gauge issue Just swapped mine out on my 2000 Jimmy. $331 from AutoZone. When you swapped yours did you get the updated witing harness with it? It may or may not have anything to do with it. But if you did change it out it could be one of the wire are not making good contact.
	[Reply w/Quote]

08-04-2009, 08:36 PM	#5
So Low Roller INDEPENDENT Age: 24 Join Date: Nov 2004 Posts: 2,990 Location: Visalia, CA User is: OffLine	Re: Fuel Gauge issue something isnt getting a signal / connection, i would check fuse's and grounds.
	[Reply w/Quote]

08-08-2009, 07:02 PM	#6
phatnogin5877 Registered User Age: 31 Join Date: Aug 2009 Posts: 3 Location: User is: OffLine	Re: Fuel Gauge issue Quote: Originally Posted by Calvin51 Just swapped mine out on my 2000 Jimmy. $331 from AutoZone. When you swapped yours did you get the updated witing harness with it? It may or may not have anything to do with it. But if you did change it out it could be one of the wire are not making good contact. No I bought an AC DELCO from ebay. Its a genuine exact replacement (Yes its new) but it did not come with any other wiring harness. I did a little trouble shooting. I pulled the instrument cluster out and if I ground pin#1 of the fuel guage it goes to full (Low fuel light does not go out). This tells me the guage is most likely working but there is an open circuit. Im not sure if the fuel light should go out when I grond it or not. Here is the odd part I have a wiring diagram that says the wire from the sending unit is purple and goes directly to the guage. There are NO purple wires in the harness that connects to the cluster. Also when I test for continuity from the guage to the pins on the harness I get no continuity, the path stops at a little circuit board that I cant remove. Is it possible something in this little board is my problem? So to help me troubleshoot a little more does anyone know the actual color of the fuel level sending wire that goes into the instrument cluster? Its not purple! any other thoughts or suggestions are much appreciated.
	[Reply w/Quote]

08-23-2009, 03:37 PM	#7
generics10 Registered User Join Date: Aug 2006 Posts: 248 Location: columbia city, indiana User is: OffLine	Re: Fuel Gauge issue Ive got the same problem... And my oil pressure gage is doing the same thing... I think its in the bcm, cluster or the connections.
	[Reply w/Quote]