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.
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HOMESERVICE MANUALSCADILLAC1993FLEETWOOD BROUGHAM V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTUNE-UP AND ENGINE PERFORMANCE CHECKSFUEL PRESSURETESTING AND INSPECTIONFUEL SYSTEM PRESSURE RELIEF PROCEDURE
1993 Cadillac Fleetwood Brougham V8-350 5.7L
Fuel System Pressure Relief Procedure
1993 Cadillac Fleetwood Brougham V8-350 5.7LSECTION Fuel System Pressure Relief Procedure
THROTTLE BODY INJECTION WITH INTERNAL BLEED
The fuel system pressure must be relived before disconnecting fuel line fittings.
CAUTION:
^ To reduce the risk of fire and personal injury, it is necessary to relieve fuel system pressure before disconnecting fuel line fittings.
^ After relieving system pressure as described in the following procedure, a small amount of fuel may be released when disconnecting fuel line fittings. In order to reduce the chance of personal injury, cover fuel line fittings with a shop towel before disconnecting, to catch any fuel that may leak out. Place the towel in an approved container when disconnect is completed.
PROCEDURE
1. Ignition "OFF."
2. Disconnect negative battery cable to avoid possible fuel discharge if an accidental attempt is made to start the engine.
3. Loosen fuel filler cap to relieve tank vapor pressure.
4. The internal constant bleed feature of the Throttle Body Injection (TBI) unit relieves fuel pump system pressure when the engine is turned "OFF." Therefore, no further pressure relief procedure is required.
5. Fuel line fittings are now safe for servicing.
6. Perform service required.
7. Tighten fuel filler cap.
8. Ignition "OFF."
9. Connect negative battery cable.
10. Cycle ignition "ON" and "OFF" twice, waiting ten seconds between cycles, then check for fuel leaks.
The fuel system pressure must be relived before disconnecting fuel line fittings.
CAUTION:
^ To reduce the risk of fire and personal injury, it is necessary to relieve fuel system pressure before disconnecting fuel line fittings.
^ After relieving system pressure as described in the following procedure, a small amount of fuel may be released when disconnecting fuel line fittings. In order to reduce the chance of personal injury, cover fuel line fittings with a shop towel before disconnecting, to catch any fuel that may leak out. Place the towel in an approved container when disconnect is completed.
PROCEDURE
1. Ignition "OFF."
2. Disconnect negative battery cable to avoid possible fuel discharge if an accidental attempt is made to start the engine.
3. Loosen fuel filler cap to relieve tank vapor pressure.
4. The internal constant bleed feature of the Throttle Body Injection (TBI) unit relieves fuel pump system pressure when the engine is turned "OFF." Therefore, no further pressure relief procedure is required.
5. Fuel line fittings are now safe for servicing.
6. Perform service required.
7. Tighten fuel filler cap.
8. Ignition "OFF."
9. Connect negative battery cable.
10. Cycle ignition "ON" and "OFF" twice, waiting ten seconds between cycles, then check for fuel leaks.
RENDER: 1.0x
NO RELATED
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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.