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Discussion Starter · #1 ·
I've been trying to figure this problem for a while. I changed the motor out and it won't crank. Security light is solid and won't go off even when the key is in the off position. Two grounds on the engine harness are getting 12 volts. Somehow the fuel pump is working getting pressured to the intake. Pulled the cover off the starter relay and the motor cranks over that way but not by the key. I'm getting 12 volt to the crank fuse when the key is in start position but my scanner won't communicate with the obd2 port. Cigarette lighter works fine, good battery and all the fuses are good.
 

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Check all of your ground connections and I mean all. Battery to block,block to frame, and most important of all the ground wires for the computer that either bolt to the head and/or block.
 

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You try the security relearn?

sent from my Verizon Wireless Galaxy SIII
 

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Discussion Starter · #8 ·
I reused the pump so possible o ring pinched but I'm just going put new one while in there again but does anyone know if u got use feeler gauges to clearance the gear and pump
 

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2003 Chevrolet K Silverado - 4WD | Sierra, Silverado VIN C/K Service Manual | Engine | Engine Mechanical - 4.8L, 5.3L, and 6.0L | Repair Instructions - On Vehicle |
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Oil Pump, Screen, and Crankshaft Oil Deflector Replacement
Removal Procedure

 1. Remove the oil pan. Refer to Oil Pan Replacement.
 2. Remove the engine front cover. Refer to Engine Front Cover Replacement.
 3. Remove the oil pump screen bolt and nuts.
 4. Remove the oil pump screen with O-ring seal.
 5. Remove the O-ring seal from the pump screen.
 6. Discard the O-ring seal.

 7. Remove the remaining crankshaft oil deflector nuts.
 8. Remove the crankshaft oil deflector.

 9. Remove the oil pump bolts.
Important: Do not allow dirt or debris to enter the oil pump assembly, cap end as necessary.

10. Remove the oil pump.
11. If required, clean and inspect the oil pump. Refer to Oil Pump Cleaning and Inspection.
Installation Procedure

 1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump.
 2. Install the oil pump onto the crankshaft sprocket until the pump housing contacts the face of the engine block.
Notice: Refer to Fastener Notice in Cautions and Notices.

 3. Install the oil pump bolts.
Tighten
Tighten the bolts to 25 Y (18 lb ft).

 4. Install the crankshaft oil deflector and nuts until snug.
Object ID: 647800Click here for detailed picture of the image.

 5. Lubricate a NEW oil pump screen O-ring seal with clean engine oil.
 6. Install the NEW O-ring seal onto the oil pump screen.
Important: Push the oil pump screen tube completely into the oil pump prior to tightening the bolt. Do not allow the bolt to pull the tube into the pump.

Align the oil pump screen mounting brackets with the correct crankshaft bearing cap studs.

 7. Install the oil pump screen.
 8. Install the oil pump screen bolt and nuts.
Tighten

 1. Tighten the bolt to 12 Y (106 lb in).
 2. Tighten the nuts to 25 Y (18 lb ft).
 9. Install the engine front cover. Refer to Engine Front Cover Replacement.
10. Install the oil pan. Refer to Oil Pan Replacement.
 
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