'84 Fuel Gauge issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bob Q · 01-07-2018, 11:34 AM

Recently the fuel gauge on our '84 K2500 diesel started pointing past full at about 3:00 regardless of which fuel tank is selected. Do you think this sounds like a bad ground or a bad gauge? I unplugged the weatherpack harness at the valve and plugged it back in thinking there might be corrosion on the terminals, but no luck. Since it's happening on either tank, do you think I should trace the wire from the B terminal on the valve weatherpack back to the dash and see if the issue is there, since from what I understand from Hatzie's dual tank theory thread below, that is the common sending unit wire back to the gauge?

Thanks.

Bob Q · 01-07-2018, 09:22 PM

Made some progress on this. Cleaned the frame ground on the passenger tank and the gauge now seems to be working for that side. Didn't have the same luck on the driver side. Cleaned the frame ground on the driver, but the gauge still reads at 3:00. Also, tried jumping the ground terminal on the sender with another wire to a good ground, but still no luck. Any suggestions for the driver side tank?

Thanks.

**hatzie** · 01-07-2018, 10:50 PM

Try ohming out the wire from the sender to the valve plug with a multimeter.
It should read close to 0 ohms.
If the tank ground and the sender wire are both OK then the sender is bad.

01-07-2018, 11:34 AM	#1
Bob Q Registered User Join Date: Jun 2003 Location: California Posts: 68	'84 Fuel Gauge issues Recently the fuel gauge on our '84 K2500 diesel started pointing past full at about 3:00 regardless of which fuel tank is selected. Do you think this sounds like a bad ground or a bad gauge? I unplugged the weatherpack harness at the valve and plugged it back in thinking there might be corrosion on the terminals, but no luck. Since it's happening on either tank, do you think I should trace the wire from the B terminal on the valve weatherpack back to the dash and see if the issue is there, since from what I understand from Hatzie's dual tank theory thread below, that is the common sending unit wire back to the gauge? Thanks. __________________ Bob Q. '83 K2500 6.2L

01-07-2018, 09:22 PM	#2
Bob Q Registered User Join Date: Jun 2003 Location: California Posts: 68	Re: '84 Fuel Gauge issues Made some progress on this. Cleaned the frame ground on the passenger tank and the gauge now seems to be working for that side. Didn't have the same luck on the driver side. Cleaned the frame ground on the driver, but the gauge still reads at 3:00. Also, tried jumping the ground terminal on the sender with another wire to a good ground, but still no luck. Any suggestions for the driver side tank? Thanks. __________________ Bob Q. '83 K2500 6.2L

01-07-2018, 10:50 PM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,913	Re: '84 Fuel Gauge issues Try ohming out the wire from the sender to the valve plug with a multimeter. It should read close to 0 ohms. If the tank ground and the sender wire are both OK then the sender is bad. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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