Vettefrc." THANKS"!!! 
!!!** please help**!! Need to know all ls1 grounds
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From: Eagle pass
!!!** please help**!! Need to know all ls1 grounds Hello ls1 tech fellows." ive got my ls1 motor installed and ready to fire but im not getting any signal to fuel pump.
ive got power to the fuse box..i was thinking maybe a ground...plz help guys!!
ive got power to the fuse box..i was thinking maybe a ground...plz help guys!! 
Remember that the PCM provides power to the low current side of the relay, you would provide ground to the other side.
Jon
PSI
Jon
PSI
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From: Eagle pass
Jon Hey jon i appreciate ur help..is there any way u can tell me bow the grounds go. Like from where to where.? Plz.. Is it possi le that a ground could cuse this or a bad crank sensor ect..which i doubt it be a sensor..idk"?
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From: Paso Robles, CA
On my LS1 swap the fuel pump has a seperate ground at the pump itself. Your harness also has several grounds that need to be connected to bare metal. My engine is grounded to the firewall on both heads, the body is then grounded to the frame and the engine is also grounded to the frame. These grounds are all 4 gauge wire. Good ground points are essential!
Your fuel pump should turn on when the key is turned forward, are you sure the keyed hot is hooked up. It needs to provide constant power when the vehicle is cranking. I believe the crank sensor only comes into play when the engine is cranking, the pcm picks up the crank signal and tells the fuel pump to run??? But your fuel pump should turn on with just the key forward and not cranking. Possibly a bad relay or not wired correctly, have you tried running 12 volts directly to the pump to make sure the pump is good?
Hope this helps
Your fuel pump should turn on when the key is turned forward, are you sure the keyed hot is hooked up. It needs to provide constant power when the vehicle is cranking. I believe the crank sensor only comes into play when the engine is cranking, the pcm picks up the crank signal and tells the fuel pump to run??? But your fuel pump should turn on with just the key forward and not cranking. Possibly a bad relay or not wired correctly, have you tried running 12 volts directly to the pump to make sure the pump is good?
Hope this helps
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From: Eagle pass
Thank jon ill check asson as i get home The fuel pump kicks on. I test the pump through my trap door i made and it works.. But i thought the only grounds to the head were on the driver side and three of them...i dont recall a ground on the passenger side head on the back..Mmmmm"!?? I need to check when i get home. Thx man!!
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From: Eagle pass
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