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Username Post: Dual tank '87 TBI - how to wire pumps
cloudmaster 
Senior Member
Posts: 980
cloudmaster
Loc: Arrowsmith, IL
Reg: 01-30-02
06-15-12 02:11 PM - Post#2237510    

So, on a dual-tank '87 model with TBI, how are the in-tank pumps wired? Are there two relays connected to the tank switcher which switch the fuel gauge and the pumps, or do the pumps just run constantly, or is there another thing hooked up off of the in-dash switch?

Anyone got a service manual with the wiring diagram? Wiring the fuel pumps is about the last thing I have to do in my HP Avenger TBI setup (on my dual-tank '85), and I figure that GM probably had a decent idea when they did theirs...

And "yes, I want both tanks" for the healthy 454, followed by "no, I can't run a suburban tank" 'cause my DMI bumper's in the way.
'71 Malibu: 350/200-4R/3.73 Eaton posi
'75 Elky: 350HO/TH350/3.42 peg leg
'85 C20: 454/TH400/3.73 locker
'95 Caprice Wagon: LT1/4L60E/3.42 posi
'95 BMW 740i: untouched, but a V8
'04 Grand Marquis: 2V4.6/3" pipes/SCT flash

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