dual tanks working, but right side gauge not? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*1LOW4X4* · 02-01-2011, 02:43 PM

hey guys, i have dual tanks on my 85 c20. they are both full, and the left side gauge works fine. but when you switch it over to the passenger side the gauge just falls down and never moves, no matter the level of gas in the tank. both tanks actually pump fuel, just the right side gauge sucks.

am i lookin at pulling the tank?

heres left side-works fine

passenger tank, no workie.

GMC Guy · 02-01-2011, 02:51 PM

check your wires first. trace the sending unit wire for the gauge, all the way up to the connection from the circuit board to the gauge itself.

dabels23 · 02-01-2011, 02:52 PM

Sounds like a bad sending unit(in the tank) or a bad ground to that sending unit.

baclay9 · 02-01-2011, 03:16 PM

I have found this is usually due to a bad ground on the sending unit.
Posted via Mobile Device

Chevyman350 · 02-01-2011, 04:17 PM

in my 1987 R30 it ended up being that the retaining clip for the float came off, and the ground was almost rubbed into 2 pieces (some how it got routed between the bed support and the frame.)

*1LOW4X4* · 02-01-2011, 04:17 PM

Thanks guys. So I'm assuming sendin unit is right there stuck in the tank?
Posted via Mobile Device

Hulk Will Smash · 02-01-2011, 04:25 PM

My right side tank doesn't show on the gauge either, but rather than fall down it just keeps reading the left side. Definately not worth changing the sender, but once I "x" a few more to-dos off my list, I'm going to start tracing wires and see if it's something easy.

02-01-2011, 02:43 PM	#1
1LOW4X4 Account Suspended Join Date: Jul 2010 Location: Southeast Texas Posts: 189	dual tanks working, but right side gauge not? hey guys, i have dual tanks on my 85 c20. they are both full, and the left side gauge works fine. but when you switch it over to the passenger side the gauge just falls down and never moves, no matter the level of gas in the tank. both tanks actually pump fuel, just the right side gauge sucks. am i lookin at pulling the tank? heres left side-works fine passenger tank, no workie.

02-01-2011, 02:51 PM	#2
GMC Guy Registered User Join Date: May 2009 Location: Sparks, NV Posts: 913	Re: dual tanks working, but right side gauge not? check your wires first. trace the sending unit wire for the gauge, all the way up to the connection from the circuit board to the gauge itself. __________________ Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__ ............._____l __\__ ..............l_(O)_ l___(O)]

02-01-2011, 02:52 PM	#3
dabels23 Registered User Join Date: Sep 2009 Location: Eudora, KS Posts: 131	Re: dual tanks working, but right side gauge not? Sounds like a bad sending unit(in the tank) or a bad ground to that sending unit.

02-01-2011, 03:16 PM	#4
baclay9 Registered User Join Date: Apr 2010 Location: Newcastle, OK Posts: 1,344	Re: dual tanks working, but right side gauge not? I have found this is usually due to a bad ground on the sending unit. Posted via Mobile Device

02-01-2011, 04:17 PM	#5
Chevyman350 Registered User Join Date: Dec 2009 Location: Madison, Wi Posts: 80	Re: dual tanks working, but right side gauge not? in my 1987 R30 it ended up being that the retaining clip for the float came off, and the ground was almost rubbed into 2 pieces (some how it got routed between the bed support and the frame.)

02-01-2011, 04:25 PM	#7
Hulk Will Smash Registered User Join Date: Apr 2006 Location: Huntington Beach, CA Posts: 492	Re: dual tanks working, but right side gauge not? My right side tank doesn't show on the gauge either, but rather than fall down it just keeps reading the left side. Definately not worth changing the sender, but once I "x" a few more to-dos off my list, I'm going to start tracing wires and see if it's something easy. __________________ '87 R30 Crew Cab Dually It's 11 PM, do you know where your IAC pintle is?



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