1999 Chevy Tahoe Fuel System Wiring

1999 CHEVROLET TAHOE

CHEECH1

MEMBER
1 POST

Engine Performance problem
1999 Chevy Tahoe V8 Automatic

Need wiring diagram for fuel pump, relay and ECU wiring to relay. Looking for pin voltage for relay plug, feed wire from computer to relay pin, volt and color. Have a no start with a dead Fuel Pump, put 12V to FP no turn on. I know the FP is bad but want to make sure computer did not also go bad and check wiring.

Thanks,
Frank

Oct 19, 2010 at 4:10 PM

RASMATAZ

✓ASE Certified Mechanic
75,992 POSTS

If you're feeding it with 12volts from the battery positive post and the ground circuit is good on the fuel pump its defective-plain and simple the computer control of the fuel pump relay is being bypassed-therefore the computer is out of the way-it should come on. Check out the images (below).

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
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Oct 21, 2010 at 4:15 AM

CHEECH1

MEMBER
1 POST

I know that. I want to know the voltage and ground at the relay pins. There are five pins , One 12 Volt with key on, one ground, what are the other pins providing to rely and from where, need voltage at pin location/wiring diagram.

Thanks,
Frank

Oct 21, 2010 at 7:27 AM

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