Question about 1999 GMC Safari
Did you verify that the relay terminals have the appropriate signals to them?
ECM fuse B (20-amp) should provide power at all times to the orange wire of the fuel pump relay. The relay coil receives ground via the black wire, and relay coil gets power from the dark green/white wire. When the relay is closed, you should have battery power on the gray wire.
The relay trigger wire should have power from the dark green/white wire in terminal 1 of the Vehicle Control Module (VCM) connector for the first couple of seconds after they key is turned to run (to prime the system) and when the truck is running. Checking for all the appropriate signals at the relay is where I would start. That is after I checked for diagnostic codes.
Believe the fuel relay is the middle relay out of the three in the left rear of the glove box. Last thing is to hot wire the fuel pump if you can not get it scanned, see if the pump is bad unless your going to have a shop work on changing the fuel pump.
Good luck and hope this helps. keep me posted.
Posted on May 12, 2009
Tips for a great answer:
Apr 15, 2015 | 2000 Oldsmobile Silhouette
Apr 05, 2014 | 2000 Chevrolet Malibu
Mar 13, 2014 | Cars & Trucks
Aug 28, 2011 | Oldsmobile Alero Cars & Trucks
Feb 03, 2010 | 2003 Chevrolet S-10
Nov 07, 2009 | 2000 Pontiac Grand Am GT
Jun 27, 2009 | 1986 BMW 3 Series
May 06, 2009 | 2000 Chevrolet S-10
418 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: