📝 Vortec CSFI needs full pressure — a weak pump causes long cranks and lean codes before it dies outright. Test pressure at the rail: spec is roughly 60-66 psi key-on.
⚠️ Verify before buying. Fitment varies by year, engine (4.3/5.0/5.7/7.4/6.5) and 2WD/4WD. Confirm against your VIN/build before ordering.