spectra fuel pump

D

donelle87ls

Not-quite-so-new-guy
Sep 29, 2017
16
3
3
#1
hello i have a 87 montecarlo with the tbi.
I ordered the spectra #sp172a1h sending unit the spectra unit has 2 pins as my stock unit has 3 pins that connects to the fuel wiring harness . is there a way that i can wire the spectra wires into the stock one.
 
D

donelle87ls

Not-quite-so-new-guy
Sep 29, 2017
16
3
3
#3
Does the Spectra have a ground tab? You should only need pump power and fuel level inside the tank; if you ground the assembly on top (outside of tank).
yes it has a ground tab would i need to splice the pink wire to get a read on the fuel level.
 
UNGN

UNGN

Comic Book Super Hero
Sep 6, 2016
2,595
1,047
113
Southlake, TX
#4
The tank should have 3 wires: fuel pump +, Sending unit wire and common ground. What ever wire isn't 12 volts with the key on or makes the fuel gage move when grounded gets hooked to ground. (it should also show zero Ohms to ground on the multimeter)

Never trust wire colors in 30 year old cars. Test them.
 

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