Problem with gas gauge... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SRH916 · 03-03-2008, 02:00 AM

I'm not sure exactly what is going on with my gas gauge, but when I fill it up it goes WAY past full and just stays there till my tank gets emptier, I don't even wanna risk it going past half way. The last time I filled it up at half way I was able to get 20 gallons in there... Running on empty

. I'm glad I filled up when I did.

Does anyone know what is the problem here? Any ideas? Could it be a bad connection or is something knocked loose or out of "position"? I would like to get this fixed soon since I'm going to start driving more aka: "getting my lisence"

Thanks in advance,

Jared

BoeJaker1976 · 03-03-2008, 08:46 AM

hey man, this is my first t ime back to this forum in a very long time. anyways, i just went through the same thing with my 76 stepside yesterday. but heres what i learned:
1. before droping the tank removed the bolt that holds the grounding lead from the fuel tank. make sure there is a good ground. remove any rust and have a good metal to metal contact.
2. if that doesnt fix it follow the signal wire to ensure the there is no short (chaffing or cut) on the wire that goes all the way to you cluster board.
3. if that no worky, then drop the tank, remove the sending unit, disconnect the wires (and be sure to lable the fuel lines....unlike what i did, it'll save you time) and take an ohm meter from the main signal termal to a ground on the sending unit itself (pretty much anywhere). with the ohm meter leads attached move the float up and down and check for a reading at about 0-90 ohms.

in your situation, it sounds like the ohms are too high and the rehostat in the float is shot. that would be my guess.

well i hope this was of some help

joey

ps. if the sending unit is bad...when you go get the new one....use the ohm meter when you first get the part at the store (which was my problem yesterday) it'll save a lot of frustration

boxrodz · 03-03-2008, 09:47 AM

Just to add to Joey's post, check out the following past thread (http://67-72chevytrucks.com/vboard/s...d.php?t=269636). I agree that it is 'bably a faulty connection or the sending unit. If those check out ok, then it might be the fuel gauge. But, you can check it as well, as described in this past thread (http://67-72chevytrucks.com/vboard/s...d.php?t=179942).

SRH916 · 03-03-2008, 12:16 PM

thanks for the help. i will try to check it out on monday. will post and try to get pictures, cause i know others have had this problem

03-03-2008, 02:00 AM	#1
SRH916 1975 C-10 Silverado LWB Join Date: Nov 2007 Location: Sacramento, CA Posts: 326	Problem with gas gauge... I'm not sure exactly what is going on with my gas gauge, but when I fill it up it goes WAY past full and just stays there till my tank gets emptier, I don't even wanna risk it going past half way. The last time I filled it up at half way I was able to get 20 gallons in there... Running on empty . I'm glad I filled up when I did. Does anyone know what is the problem here? Any ideas? Could it be a bad connection or is something knocked loose or out of "position"? I would like to get this fixed soon since I'm going to start driving more aka: "getting my lisence" Thanks in advance, Jared __________________ 1975 LWB C-10 Silverado - Stock - "BIG 10" - 4 Bolt 350 "Brand new" 1200mi - THM-375 "Brand new w/trans cooler" 5000mi 1995 Ford Lightning - Bone Stock - 351W - Vortech?? Last edited by SRH916; 03-03-2008 at 02:48 AM.

03-03-2008, 08:46 AM	#2
BoeJaker1976 Registered User Join Date: May 2005 Location: copperas Cove, TX Posts: 85	Re: Problem with gas gauge... hey man, this is my first t ime back to this forum in a very long time. anyways, i just went through the same thing with my 76 stepside yesterday. but heres what i learned: 1. before droping the tank removed the bolt that holds the grounding lead from the fuel tank. make sure there is a good ground. remove any rust and have a good metal to metal contact. 2. if that doesnt fix it follow the signal wire to ensure the there is no short (chaffing or cut) on the wire that goes all the way to you cluster board. 3. if that no worky, then drop the tank, remove the sending unit, disconnect the wires (and be sure to lable the fuel lines....unlike what i did, it'll save you time) and take an ohm meter from the main signal termal to a ground on the sending unit itself (pretty much anywhere). with the ohm meter leads attached move the float up and down and check for a reading at about 0-90 ohms. in your situation, it sounds like the ohms are too high and the rehostat in the float is shot. that would be my guess. well i hope this was of some help joey ps. if the sending unit is bad...when you go get the new one....use the ohm meter when you first get the part at the store (which was my problem yesterday) it'll save a lot of frustration __________________ 1976 Red chevy steppy, Proud service member, US ARMY 15Y, AH-64D Apache Longbow Armament, Avionics, Electronics technician

03-03-2008, 09:47 AM	#3
boxrodz Until Seventy Times Seven Join Date: Feb 2005 Location: Rocky Mountain Front Range Posts: 1,301	Re: Problem with gas gauge... Just to add to Joey's post, check out the following past thread (http://67-72chevytrucks.com/vboard/s...d.php?t=269636). I agree that it is 'bably a faulty connection or the sending unit. If those check out ok, then it might be the fuel gauge. But, you can check it as well, as described in this past thread (http://67-72chevytrucks.com/vboard/s...d.php?t=179942). __________________ boxRODz 1983 C10 SWB Fleetside When two halves is gone, there's nuthin left. Two nothings is nuthin. That's mathematics son. You can argue with me but you can't argue with figures. Two half nothings is a whole nuthin...

03-03-2008, 12:16 PM	#4
SRH916 1975 C-10 Silverado LWB Join Date: Nov 2007 Location: Sacramento, CA Posts: 326	Re: Problem with gas gauge... thanks for the help. i will try to check it out on monday. will post and try to get pictures, cause i know others have had this problem __________________ 1975 LWB C-10 Silverado - Stock - "BIG 10" - 4 Bolt 350 "Brand new" 1200mi - THM-375 "Brand new w/trans cooler" 5000mi 1995 Ford Lightning - Bone Stock - 351W - Vortech??



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