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tucsonjwt · 10-28-2010, 09:50 PM

Not sure about that clicking sound - my 83 dual tank makes a slight buzzing motor type sound when switched from left to right. Could you define what "going beserk" means, exactly? Does the other tank function properly? If so, then I would suspect the sending unit in the bad behaving tank. Are you actually able to suck gas out of both tanks and run the truck when you select left or right? If so, then the selector switch and valve under the cab are working. If you search here and elsewhere on the net you can get a lot of tips on diagnosing gas gauge problems.
If you need a selector switch - less than $20.
If you need a sending unit - $40-$160, depending on aftermarket (Spectra) or OEM (AC/Delco). Aftermarkets will cause the gas gauge needle to bounce when you drive the truck.

10-28-2010, 09:50 PM	#6
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,188	Re: Dual Tanks ? 84 Silverado Not sure about that clicking sound - my 83 dual tank makes a slight buzzing motor type sound when switched from left to right. Could you define what "going beserk" means, exactly? Does the other tank function properly? If so, then I would suspect the sending unit in the bad behaving tank. Are you actually able to suck gas out of both tanks and run the truck when you select left or right? If so, then the selector switch and valve under the cab are working. If you search here and elsewhere on the net you can get a lot of tips on diagnosing gas gauge problems. If you need a selector switch - less than $20. If you need a sending unit - $40-$160, depending on aftermarket (Spectra) or OEM (AC/Delco). Aftermarkets will cause the gas gauge needle to bounce when you drive the truck.