Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel System
1991 Cadillac Seville STSSECTION Fuel System
- Prior to checking fuel system for a no-start condition, check ignition for proper spark. Check for proper fuel pump pressure (approximately 40-47 psi or 2.8-3.3 kg/cm2 ; 40-50 psi or 2.8-3.5 kg/cm2 on Cadillac 4.9L PFI) and capacity (1 pt. or .47L in 30 seconds). See BASIC FUEL SYSTEM CHECKS in this article.
- Disconnect injector harness. Turn ignition on and check for battery voltage at each injector harness. See Fig 1-Fig 5 . Battery voltage should be present on one side of each injector. If battery voltage is not present, check for blown injector power fuse. If battery voltage is present on both injector terminals, check for wires shorted together.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.