Fuel tank switch '86 vs. '87 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kevinr1970 · 02-25-2008, 07:53 AM

I recently bought a fuel tank switch to use on my '86 truck. It turns out the switch I bought is for '87 and newer.

On the switch one of the four "poles" has a "bump".
The only difference I can see is that the "bump" is on a different "pole" on the two switches.

My question is, if I can remove the bump on the newer switch will it work on the older truck?
I have to assume there is something different about the switches or why would they make them different?
But if one will work in place of the other I will just figure out a way to remove the bump.

kevinr1970 · 02-25-2008, 01:15 PM

Oops, meant to attach this picture.

blu87 · 02-25-2008, 09:04 PM

I think probably the same, bumps notwithstanding. To keep it simple, I would ohm meter each terminal and match them to one another. You're checking for s/w terminal continuity, not ohm resistance. I just changed my 87 s/w out and the orig one looks like yours on the left.

**Captkaos** · 02-27-2008, 01:17 AM

I would check them, they require different PN', but I don't know if it makes a difference. The 87 does have electric pumps...

02-25-2008, 07:53 AM	#1
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Fuel tank switch '86 vs. '87 I recently bought a fuel tank switch to use on my '86 truck. It turns out the switch I bought is for '87 and newer. On the switch one of the four "poles" has a "bump". The only difference I can see is that the "bump" is on a different "pole" on the two switches. My question is, if I can remove the bump on the newer switch will it work on the older truck? I have to assume there is something different about the switches or why would they make them different? But if one will work in place of the other I will just figure out a way to remove the bump. __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

02-25-2008, 01:15 PM	#2
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Re: Fuel tank switch '86 vs. '87 Oops, meant to attach this picture. Attached Images __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

02-25-2008, 09:04 PM	#3
blu87 Registered User Join Date: Jan 2008 Location: Pensacola Fl Posts: 270	Re: Fuel tank switch '86 vs. '87 I think probably the same, bumps notwithstanding. To keep it simple, I would ohm meter each terminal and match them to one another. You're checking for s/w terminal continuity, not ohm resistance. I just changed my 87 s/w out and the orig one looks like yours on the left. __________________ Gene Last edited by blu87; 02-25-2008 at 09:07 PM.

02-27-2008, 01:17 AM	#4
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: Fuel tank switch '86 vs. '87 I would check them, they require different PN', but I don't know if it makes a difference. The 87 does have electric pumps... __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

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