After completing an engine swap the fuel pump is not getting initial prime?

1994 CHEVROLET BLAZER
5,000 MILES • 6.2L • V8 • 4WD • AUTOMATIC
Avatar
SPENCER EROSHINSKY
Ls3 crate engine swapped into the vehicle listed above. Can’t figure out why the fuel pump isn’t getting initial prime when we’ve already checked the fuses, relays and the pump itself and they are all functional.
Apr 16, 2025 at 1:34 PM
Advertisement
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,503 POSTS
  • ASE Certified Mechanic
Did you swap the PCM as well? Are there any codes? There is a safety built in if the PCM does not see airflow from the MAF sensor it will not turn the fuel pump on. I need more information to help you. Also, is the security light flashing when you try to crank the engine over?
Apr 17, 2025 at 10:30 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.