Fuel gauge problem solved - Chevy and GMC Duramax Diesel Forum
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Old 08-01-2010, 12:38 PM   eBay Motors  #1 (permalink)
 
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Fuel gauge problem solved

I thought I would post here my problem and the solution so maybe someone with the same problem could maybe try and not have to go through what I did. PROBLEM: Fuel gauge quit working light came on and stayed on empty and transfer pump of course did not work. By the way this is a 2004 chevy cab and chassis w/dual tanks. This is a list of what steps I took.
Checked fuses cause I was getting no voltage to the sending unit. Went ahead and changed front tank sending unit($125) still not working. So next was my biggest mistake and took it to the dealer. I figured I would pay $98 for them to figure it out since they are the experts so they call me and I talk to the tech who said I was getting voltage to the front unit but the rear sending unit showed an open current and they would be glad to fix it for $950+tax. So I said no I will pick it up. Bought the part of the sending unit I needed ($145)and replaced it in the rear tank. Still not working. I bought a used instrument cluster($100) and still not working also replace the stepper motor behind fuel gauge still not working. I was in the process of installing an aftermarket gauge when I came across a wiring diagram of the fuel system on the internet(alldata). There are two wires coming from the ecm that work the fuel gauge so I took apart the fuse box to check if I seen anything obvious. It seemed as though all the wires were where they were supposed to be. I just wanted to make sure that there was none pulled out of place. I couldn"t find anything so I bolt back the section of fuse block that the fuel relay fuse is at and the damn gauge started working and has worked for the last 3 weeks. SOLUTION: One of the wire ends must have quit making contact and when I took it apart and put it back together it must made contact again. Believe me this is the short and might I add cleaned up version. I hope this helps
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Old 08-01-2010, 12:40 PM   eBay Motors  #2 (permalink)
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Could you please give me a link to the alldata page with that info, i am having this same problem.
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Old 08-01-2010, 01:02 PM   eBay Motors  #3 (permalink)
 
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Its alldata.com and it is by subscription you to pay like $26 or so for one year. What is the problem just fuel gauge not working?
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Old 08-01-2010, 01:45 PM   eBay Motors  #4 (permalink)
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This is what I understand------

There is a transfer pump on cab and chassis models, with two tanks-- the system is suppose to be computer operated, and move the fuel from the rear tank, to the side tank, as the side tank gets low on fuel.

There is no lift pump to move the fuel from the fuel tanks to the engine, that is the same as all other d-Max, and requires you hand prime the system.

It is possible the relay connections were not making contact.
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Old 02-13-2011, 06:17 AM   eBay Motors  #5 (permalink)
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is the fuse box you aRE TALKING ABOUT in the engine compartment on the left side? mine is doing the exact same thing
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Old 02-13-2011, 07:28 AM   eBay Motors  #6 (permalink)
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They might use the "Fuel Pump" relay that is used for the gas engines-- it is in the underhood fuse box. (regular diesels do not use this, as there is no pump)
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Old 02-13-2011, 09:36 AM   eBay Motors  #7 (permalink)
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mine is a 2004.5 LLY chassis cab and my fuel gauge has not worked in sometimwe... i replaced the stepper motor and still does not work.. is there a way to check the sending unit? i was going to try what mb3240 did to fix his also..
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Old 04-26-2012, 11:05 PM   eBay Motors  #8 (permalink)
 
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Quote:
Originally Posted by mb3240 View Post
I thought I would post here my problem and the solution so maybe someone with the same problem could maybe try and not have to go through what I did. PROBLEM: Fuel gauge quit working light came on and stayed on empty and transfer pump of course did not work. By the way this is a 2004 chevy cab and chassis w/dual tanks. This is a list of what steps I took.
Checked fuses cause I was getting no voltage to the sending unit. Went ahead and changed front tank sending unit($125) still not working. So next was my biggest mistake and took it to the dealer. I figured I would pay $98 for them to figure it out since they are the experts so they call me and I talk to the tech who said I was getting voltage to the front unit but the rear sending unit showed an open current and they would be glad to fix it for $950+tax. So I said no I will pick it up. Bought the part of the sending unit I needed ($145)and replaced it in the rear tank. Still not working. I bought a used instrument cluster($100) and still not working also replace the stepper motor behind fuel gauge still not working. I was in the process of installing an aftermarket gauge when I came across a wiring diagram of the fuel system on the internet(alldata). There are two wires coming from the ecm that work the fuel gauge so I took apart the fuse box to check if I seen anything obvious. It seemed as though all the wires were where they were supposed to be. I just wanted to make sure that there was none pulled out of place. I couldn"t find anything so I bolt back the section of fuse block that the fuel relay fuse is at and the damn gauge started working and has worked for the last 3 weeks. SOLUTION: One of the wire ends must have quit making contact and when I took it apart and put it back together it must made contact again. Believe me this is the short and might I add cleaned up version. I hope this helps

Can you please explain where the "section" of the fuse block that has the relay. What is the relay listed as on the fuse block? And u just removed it, inspected it and put it back or did you do something else
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Old 05-03-2012, 06:27 PM   eBay Motors  #9 (permalink)
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My fuel gauge just started going out, I filled my tank and after 30 min of driving went down to 1/2 a tank turn off the engine when I started again, I was on empty. Could you explain (in detail) what you did...thanks susan
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Old 05-03-2012, 07:01 PM   eBay Motors  #10 (permalink)
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Same here mine just started doing this.Can you post some pics please?
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Originally Posted by hllbllylmsne
Sounds like you screwed up the seat to steering wheel linkage, no real fix for it, sorry
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