Dual Tanks ? 84 Silverado - The 1947 - Present Chevrolet & GMC Truck Message Board Network

X Baldwin Motion · 10-28-2010, 07:12 PM

greetings, I recently acquired an 84 Silverado long bed with the dual tanks, what are the capacities of these tanks?

The rocker switch to change from left to right tank makes a clicking sound from right to left but not the other way. The gauge also goes berserk on the right tank. I am not really sure if the switch is functioning properly. Is there a schematic available that shows me gas tanks, plumbing and switching ? Is this switch prone to problems ?

Thanks in advance for the help.

Chris

Number21 · 10-28-2010, 08:53 PM

Don't know about your electrical issue but they should be 20 gallon tanks. Short beds got 16 gallon and I think some long beds did too? If they're really long under the truck, with no space on either end, then they're 20 gallon.

RandyP · 10-28-2010, 08:59 PM

LWB trucks can have either 16 or 20 gallon tanks. Mine has 16's sadly, and it is obvious when you look underneath that you have a good sized gap between the tank and rear wheel well.

palposity · 10-28-2010, 09:05 PM

I would check the ground on the right tank if the guage is only acting up for that one. Once you verify that you have a good ground, then inspect your switch.

The ground should go from the sending unit on top of the tank to the frame next to the tank.

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.

X Baldwin Motion · 10-29-2010, 06:41 PM

The "going beserk" (needle flipping from way past full back to empty) seems like behavior from a short or bad ground, I'll check that first this weekend.

The clicking or buzzing sound upon switching the tanks only happens in one direction, not both. I am not sure if it is actually switching because even though I have filled the right side tank,(been running on the left since I got the truck last week) I have not been in a position to chance running out of gas. I'll check the ground then then try to run on the right side. Thanks for the help.

**old Rusty C10** · 10-28-2010, 09:43 PM

im going to second Palpositys comments here hes on the money

palposity · 10-29-2010, 07:22 PM

Let us know how it works out for you. And welcome to the forum!

MikeJones16 · 10-29-2010, 10:58 PM

I have a simular electrical issue..
My speedo, gas gauge, and all the other little gauges do the same thing when i turn the driving lights on

10-28-2010, 07:12 PM	#1
X Baldwin Motion Registered User Join Date: Oct 2010 Location: Sag Harbor NY Posts: 103	Dual Tanks ? 84 Silverado greetings, I recently acquired an 84 Silverado long bed with the dual tanks, what are the capacities of these tanks? The rocker switch to change from left to right tank makes a clicking sound from right to left but not the other way. The gauge also goes berserk on the right tank. I am not really sure if the switch is functioning properly. Is there a schematic available that shows me gas tanks, plumbing and switching ? Is this switch prone to problems ? Thanks in advance for the help. Chris Last edited by X Baldwin Motion; 10-28-2010 at 07:40 PM.

10-28-2010, 08:53 PM	#2
Number21 Registered User Join Date: Aug 2009 Location: Oregon Posts: 611	Re: Dual Tanks ? 84 Silverado Don't know about your electrical issue but they should be 20 gallon tanks. Short beds got 16 gallon and I think some long beds did too? If they're really long under the truck, with no space on either end, then they're 20 gallon. __________________ '73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville.

10-28-2010, 08:59 PM	#3
RandyP Getting Old; Going Broke Join Date: Apr 2010 Location: Owasso OK Posts: 2,764	Re: Dual Tanks ? 84 Silverado LWB trucks can have either 16 or 20 gallon tanks. Mine has 16's sadly, and it is obvious when you look underneath that you have a good sized gap between the tank and rear wheel well. __________________ *Why is every used 350 sbc out of a corvette?* There's only two things that excite a man, expensive toys and real expensive toys. *VEGETARIAN: That's an old Indian word meaning "I don't hunt so good."* When the going gets tough, switch to power tools.

10-28-2010, 09:05 PM	#4
palposity Registered User Join Date: Sep 2009 Location: Syracuse NY Posts: 684	Re: Dual Tanks ? 84 Silverado I would check the ground on the right tank if the guage is only acting up for that one. Once you verify that you have a good ground, then inspect your switch. The ground should go from the sending unit on top of the tank to the frame next to the tank. __________________ Project #1 "Pops"--1980 Chevrolet Scottsdale C10 3rd Generation in the same original owner family. GOAL: Restore to "almost" original. View Project Pops HERE Project #2 "Cletus"--1986 Chevy K20 4.10 Gear Ratio GOAL: Restore into a heavy duty work/plow rig View Project Cletus HERE - SOLD DD--2008 Duramax CCSB Last edited by palposity; 10-28-2010 at 09:06 PM.

10-28-2010, 09:50 PM	#5
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.

10-29-2010, 06:41 PM	#6
X Baldwin Motion Registered User Join Date: Oct 2010 Location: Sag Harbor NY Posts: 103	Re: Dual Tanks ? 84 Silverado The "going beserk" (needle flipping from way past full back to empty) seems like behavior from a short or bad ground, I'll check that first this weekend. The clicking or buzzing sound upon switching the tanks only happens in one direction, not both. I am not sure if it is actually switching because even though I have filled the right side tank,(been running on the left since I got the truck last week) I have not been in a position to chance running out of gas. I'll check the ground then then try to run on the right side. Thanks for the help. __________________ 1985 Custom Deluxe long bed 305 3 on tree 2015 Silverado "Great White"1987 K20 dump and plow 1968 K20 327 long bed 4spd big blue 68K20 SuburPan 4spd 79C30 L96 6L90e 86 K10 plow

10-28-2010, 09:43 PM	#7
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,259	Re: Dual Tanks ? 84 Silverado im going to second Palpositys comments here hes on the money __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

10-29-2010, 07:22 PM	#8
palposity Registered User Join Date: Sep 2009 Location: Syracuse NY Posts: 684	Re: Dual Tanks ? 84 Silverado Let us know how it works out for you. And welcome to the forum! __________________ Project #1 "Pops"--1980 Chevrolet Scottsdale C10 3rd Generation in the same original owner family. GOAL: Restore to "almost" original. View Project Pops HERE Project #2 "Cletus"--1986 Chevy K20 4.10 Gear Ratio GOAL: Restore into a heavy duty work/plow rig View Project Cletus HERE - SOLD DD--2008 Duramax CCSB

10-29-2010, 10:58 PM	#9
MikeJones16 Registered User Join Date: Sep 2010 Location: Saskatoon, SK Posts: 244	Re: Dual Tanks ? 84 Silverado I have a simular electrical issue.. My speedo, gas gauge, and all the other little gauges do the same thing when i turn the driving lights on __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=429098

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