89GMCJOHN
I'm Awesome
HELP please new pickup / sending unit isnt working ...I switched from TBI to a mechanical fuel pump and
carb setup...as a result I went from an 89 4 wire sending / fuel pump unit to an 89 carbed r2500 gmc
pickup with 2 wires. This NEW sending unit only has 2 connections ? A post on top of the sending
unit- pickup I assume goes to truck harness pink or purple... then the tank has a simple black flying lead
coming off of it with a ring terminal coming off of it that I assume must go to chassis gnd . Connected
this way I get nothing at the gage ...If I disconnect the wires altogether the gage pegs like it should ...
So the gage and wires back to the dash are working....... here is a pic of the connector I cut off I
found on the net someone marked up BUT I am not sure if it is correct ... gray I dont need as its supposedly 12 for the pump the other
two wires are black , then black with a white tracer ( I am doing nothing with these two wires so far ),
the fourth wire is purple which I assume is theee sender wire....I have a feeling these two black wires
are the missing link here but since its fuel we are dealing with I am hesitant to just try anything ......
carb setup...as a result I went from an 89 4 wire sending / fuel pump unit to an 89 carbed r2500 gmc
pickup with 2 wires. This NEW sending unit only has 2 connections ? A post on top of the sending
unit- pickup I assume goes to truck harness pink or purple... then the tank has a simple black flying lead
coming off of it with a ring terminal coming off of it that I assume must go to chassis gnd . Connected
this way I get nothing at the gage ...If I disconnect the wires altogether the gage pegs like it should ...
So the gage and wires back to the dash are working....... here is a pic of the connector I cut off I
found on the net someone marked up BUT I am not sure if it is correct ... gray I dont need as its supposedly 12 for the pump the other
two wires are black , then black with a white tracer ( I am doing nothing with these two wires so far ),
the fourth wire is purple which I assume is theee sender wire....I have a feeling these two black wires
are the missing link here but since its fuel we are dealing with I am hesitant to just try anything ......
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