LS swap questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

STOCKISH · 04-22-2010, 09:25 PM

Is everyone that is running dual tanks having to use the 87 specific tank selector switch? Just wondering because I looked at both of them and they look identical. What is the difference between the two? Thanks

87chevy.com · 04-22-2010, 09:59 PM

probally reffering to the 87 fuel tank itself... there is a small baffle/bucket where the fuel pump sits into... the switches are probally the same as i cannot think of a reason why they would be different.

STOCKISH · 04-22-2010, 10:03 PM

Nope, not talking about the tanks. I know those are baffled. I have had 87 tanks, senders, intank pumps , etc for months now. The 86 and older switch on the dash and the 87-91 switches are different. Just dont remember what is different about them.

Jonboy · 04-23-2010, 08:53 AM

I think the later switch powers up the pump when it is switched (I think). Bob or Dennis will know, for sure.

foamypirate · 04-23-2010, 10:02 AM

When I was buying a new selector switch at Autozone, there were two styles. One was a momentary switch for L or R tanks that you held in place to switch the selector valve, then returns to a neutral position, and the other (the correct style for my TBI 87') stays in position for either L or R tank.

STOCKISH · 04-23-2010, 12:01 PM

I am just unsure which one I need for the LS swap. Bob or Dennis know?

**nlped** · 04-23-2010, 12:07 PM

I would think that if you are using 2 seperate pumps, you would have to have the '87 up to maintain power to the f.i. pump.

glock35ipsc · 04-23-2010, 12:24 PM

Quote:

Originally Posted by foamypirate

When I was buying a new selector switch at Autozone, there were two styles. One was a momentary switch for L or R tanks that you held in place to switch the selector valve, then returns to a neutral position, and the other (the correct style for my TBI 87') stays in position for either L or R tank.

Quote:

Originally Posted by 1972SuperCheyenne

I am just unsure which one I need for the LS swap. Bob or Dennis know?

Foamy and Jonboy have it right. There are two types, even in the 87. You want the one that is either in the R or L position. DO NOT get the one that says "Depress Fully".

NAPA usually stocks them, I had to replace mine. NAPA part number ECH FS502, $15.01.

This one:

NOT this one:

STOCKISH · 04-23-2010, 03:30 PM

OK, I get it now. The relay for the fuel pump will run through the switch and send constant power to the pump chosen where the "depress fully" switch only sends power long enough to switch the valve.

04-22-2010, 09:25 PM	#1
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	LS swap questions Is everyone that is running dual tanks having to use the 87 specific tank selector switch? Just wondering because I looked at both of them and they look identical. What is the difference between the two? Thanks __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

04-22-2010, 09:59 PM	#2
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,261	Re: LS swap questions probally reffering to the 87 fuel tank itself... there is a small baffle/bucket where the fuel pump sits into... the switches are probally the same as i cannot think of a reason why they would be different. __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress

04-22-2010, 10:03 PM	#3
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: LS swap questions Nope, not talking about the tanks. I know those are baffled. I have had 87 tanks, senders, intank pumps , etc for months now. The 86 and older switch on the dash and the 87-91 switches are different. Just dont remember what is different about them. __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

04-23-2010, 08:53 AM	#4
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: LS swap questions I think the later switch powers up the pump when it is switched (I think). Bob or Dennis will know, for sure. __________________ 1974 Jimmy- 5.3/4L80e/NP241

04-23-2010, 10:02 AM	#5
foamypirate Registered User Join Date: Apr 2009 Location: Pflugerville, TX Posts: 594	Re: LS swap questions When I was buying a new selector switch at Autozone, there were two styles. One was a momentary switch for L or R tanks that you held in place to switch the selector valve, then returns to a neutral position, and the other (the correct style for my TBI 87') stays in position for either L or R tank.

04-23-2010, 12:01 PM	#6
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: LS swap questions I am just unsure which one I need for the LS swap. Bob or Dennis know? __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

04-23-2010, 12:07 PM	#7
nlped Senior Member Join Date: Jul 2009 Location: Hayden, Al. Posts: 4,148	Re: LS swap questions I would think that if you are using 2 seperate pumps, you would have to have the '87 up to maintain power to the f.i. pump. __________________ Carter 1968 Chevy SWB Fleet... Walt 1963-1/2 Ford Falcon Futura...Martha

04-23-2010, 03:30 PM	#9
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: LS swap questions OK, I get it now. The relay for the fuel pump will run through the switch and send constant power to the pump chosen where the "depress fully" switch only sends power long enough to switch the valve. __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.



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