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Home / DTC / P0093 — Fuel System Leak Detected - Large Leak

P0093 — Fuel System Leak Detected - Large Leak

Detailed page for trouble code P0093.

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Code

P0093

Generic P — Powertrain

Fuel System Leak Detected - Large Leak

Brand: Generic
Type: P — Powertrain
Views: UK: 38 EN: 40 RU: 60
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Loose, missing, or damaged fuel filler cap or seal
  • Damaged or disconnected EVAP/fuel vapor hoses or lines
  • Cracked or punctured fuel tank or fuel line
  • Faulty or stuck open EVAP vent (vent) valve or purge valve
  • Leaking charcoal canister or purge system components
  • Fuel tank module or quick-connect leak at fittings

Symptoms

  • Check Engine Light (MIL) illuminated with P0093 stored
  • Strong fuel or vapor odor around the vehicle
  • Failed EVAP system monitor or failed emissions readiness
  • Unable to complete EVAP leak test (EVAP monitor incomplete)
  • Possible visible fuel leak or wet spots under vehicle (if liquid leak present)

What to check

  • Read and record all stored codes and freeze-frame data; note any related EVAP codes
  • Visually inspect filler cap, filler neck seal, and fuel cap condition; confirm cap is tightened and seals intact
  • Inspect EVAP lines, hoses, clamps, and connections for cracks, disconnections or loose clamps
  • Check for fuel odor and visible liquid fuel leaks around tank, lines, and fittings
  • Scan data: monitor fuel tank pressure (FTP) sensor readings and EVAP component statuses during a diagnostic test
  • Operate/command purge and vent valves with a scan tool to verify correct operation and observe system response

Signal parameters

  • Fuel tank pressure (FTP) sensor: when system commanded to hold pressure/vacuum the sensor shows immediate return to atmospheric pressure (no vacuum/pressure hold)
  • Sensor voltage or pressure trend: rapid equalization to ambient instead of gradual change during EVAP test
  • Purge valve: commanded closed but flow/path present (indicates vent or hose leak downstream/upstream)
  • Canister vent (vent) valve: should open/close on command; stuck open allows large leak signature
  • EVAP system monitor state: unable to achieve or maintain commanded pressure/vacuum during self-test

Diagnostic algorithm

  1. Retrieve freeze-frame data and complete DTC history. Note state when code set (fuel level, temperature, recent fueling).
  2. Confirm fuel cap: inspect condition, reinstall and tighten, or replace with known-good cap. Clear code and rerun monitor if appropriate.
  3. Perform a thorough visual inspection of EVAP hoses, fittings, filler neck, tank top, quick-connects and charcoal canister for obvious damage or disconnection.
  4. Use a scan tool to command EVAP vent and purge valves; verify commanded responses and check FTP sensor readings for expected changes.
  5. Perform a smoke test on the EVAP system to locate large leaks. Examine filler neck seal, vent valve, canister, hoses, and tank seams while introducing smoke.
  6. If smoke test does not reveal leak, pressure-test fuel tank and fuel lines where applicable (follow manufacturer safety procedures for pressurizing fuel system).
  7. If a component (hose, valve, tank, connector) is found leaking or faulty, repair or replace the component and retest. Replace FTP sensor or repair wiring if sensor readings are inconsistent.
  8. After repair, clear codes, run EVAP/self-test cycles, and confirm readiness monitors complete and that P0093 does not return.

Likely causes

  • Loose or missing fuel filler cap or damaged filler-neck seal
  • Disconnected or damaged EVAP hose at the charcoal canister, purge valve, or filler neck
  • Stuck open vent (canister vent) valve or purge valve allowing large venting
  • Cracked fuel tank or leaking fuel line/quick-connect fitting
  • Faulty fuel tank pressure sensor or its electrical connector

Fault status

⚠️ Status
P0093 — Fuel System/EVAP Large (gross) Leak Detected. MIL illuminated; EVAP monitor cannot hold pressure/vacuum. Inspect filler cap, EVAP hoses, valves, tank and FTP sensor.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
2,506

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Code

P0093

ISUZU P — Powertrain

Fuel System Leak Detected

Brand: ISUZU
Type: P — Powertrain
Views: UK: 28 EN: 42 RU: 37
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Loose, missing, or damaged fuel filler cap or seal
  • Damaged or disconnected EVAP/fuel vapor hoses or lines
  • Cracked or punctured fuel tank or fuel line
  • Faulty or stuck open EVAP vent (vent) valve or purge valve
  • Leaking charcoal canister or purge system components
  • Fuel tank module or quick-connect leak at fittings

Symptoms

  • Check Engine Light (MIL) illuminated with P0093 stored
  • Strong fuel or vapor odor around the vehicle
  • Failed EVAP system monitor or failed emissions readiness
  • Unable to complete EVAP leak test (EVAP monitor incomplete)
  • Possible visible fuel leak or wet spots under vehicle (if liquid leak present)

What to check

  • Read and record all stored codes and freeze-frame data; note any related EVAP codes
  • Visually inspect filler cap, filler neck seal, and fuel cap condition; confirm cap is tightened and seals intact
  • Inspect EVAP lines, hoses, clamps, and connections for cracks, disconnections or loose clamps
  • Check for fuel odor and visible liquid fuel leaks around tank, lines, and fittings
  • Scan data: monitor fuel tank pressure (FTP) sensor readings and EVAP component statuses during a diagnostic test
  • Operate/command purge and vent valves with a scan tool to verify correct operation and observe system response

Signal parameters

  • Fuel tank pressure (FTP) sensor: when system commanded to hold pressure/vacuum the sensor shows immediate return to atmospheric pressure (no vacuum/pressure hold)
  • Sensor voltage or pressure trend: rapid equalization to ambient instead of gradual change during EVAP test
  • Purge valve: commanded closed but flow/path present (indicates vent or hose leak downstream/upstream)
  • Canister vent (vent) valve: should open/close on command; stuck open allows large leak signature
  • EVAP system monitor state: unable to achieve or maintain commanded pressure/vacuum during self-test

Diagnostic algorithm

  1. Retrieve freeze-frame data and complete DTC history. Note state when code set (fuel level, temperature, recent fueling).
  2. Confirm fuel cap: inspect condition, reinstall and tighten, or replace with known-good cap. Clear code and rerun monitor if appropriate.
  3. Perform a thorough visual inspection of EVAP hoses, fittings, filler neck, tank top, quick-connects and charcoal canister for obvious damage or disconnection.
  4. Use a scan tool to command EVAP vent and purge valves; verify commanded responses and check FTP sensor readings for expected changes.
  5. Perform a smoke test on the EVAP system to locate large leaks. Examine filler neck seal, vent valve, canister, hoses, and tank seams while introducing smoke.
  6. If smoke test does not reveal leak, pressure-test fuel tank and fuel lines where applicable (follow manufacturer safety procedures for pressurizing fuel system).
  7. If a component (hose, valve, tank, connector) is found leaking or faulty, repair or replace the component and retest. Replace FTP sensor or repair wiring if sensor readings are inconsistent.
  8. After repair, clear codes, run EVAP/self-test cycles, and confirm readiness monitors complete and that P0093 does not return.

Likely causes

  • Loose or missing fuel filler cap or damaged filler-neck seal
  • Disconnected or damaged EVAP hose at the charcoal canister, purge valve, or filler neck
  • Stuck open vent (canister vent) valve or purge valve allowing large venting
  • Cracked fuel tank or leaking fuel line/quick-connect fitting
  • Faulty fuel tank pressure sensor or its electrical connector

Fault status

⚠️ Status
P0093 — Fuel System/EVAP Large (gross) Leak Detected. MIL illuminated; EVAP monitor cannot hold pressure/vacuum. Inspect filler cap, EVAP hoses, valves, tank and FTP sensor.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
Repair manuals

Manual library for ISUZU

43

Browse 43 ISUZU manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

P0093

LAND ROVER P — Powertrain

Fuel system leak detected - large leak

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 17 EN: 34 RU: 33
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Loose, missing, or damaged fuel filler cap or seal
  • Damaged or disconnected EVAP/fuel vapor hoses or lines
  • Cracked or punctured fuel tank or fuel line
  • Faulty or stuck open EVAP vent (vent) valve or purge valve
  • Leaking charcoal canister or purge system components
  • Fuel tank module or quick-connect leak at fittings

Symptoms

  • Check Engine Light (MIL) illuminated with P0093 stored
  • Strong fuel or vapor odor around the vehicle
  • Failed EVAP system monitor or failed emissions readiness
  • Unable to complete EVAP leak test (EVAP monitor incomplete)
  • Possible visible fuel leak or wet spots under vehicle (if liquid leak present)

What to check

  • Read and record all stored codes and freeze-frame data; note any related EVAP codes
  • Visually inspect filler cap, filler neck seal, and fuel cap condition; confirm cap is tightened and seals intact
  • Inspect EVAP lines, hoses, clamps, and connections for cracks, disconnections or loose clamps
  • Check for fuel odor and visible liquid fuel leaks around tank, lines, and fittings
  • Scan data: monitor fuel tank pressure (FTP) sensor readings and EVAP component statuses during a diagnostic test
  • Operate/command purge and vent valves with a scan tool to verify correct operation and observe system response

Signal parameters

  • Fuel tank pressure (FTP) sensor: when system commanded to hold pressure/vacuum the sensor shows immediate return to atmospheric pressure (no vacuum/pressure hold)
  • Sensor voltage or pressure trend: rapid equalization to ambient instead of gradual change during EVAP test
  • Purge valve: commanded closed but flow/path present (indicates vent or hose leak downstream/upstream)
  • Canister vent (vent) valve: should open/close on command; stuck open allows large leak signature
  • EVAP system monitor state: unable to achieve or maintain commanded pressure/vacuum during self-test

Diagnostic algorithm

  1. Retrieve freeze-frame data and complete DTC history. Note state when code set (fuel level, temperature, recent fueling).
  2. Confirm fuel cap: inspect condition, reinstall and tighten, or replace with known-good cap. Clear code and rerun monitor if appropriate.
  3. Perform a thorough visual inspection of EVAP hoses, fittings, filler neck, tank top, quick-connects and charcoal canister for obvious damage or disconnection.
  4. Use a scan tool to command EVAP vent and purge valves; verify commanded responses and check FTP sensor readings for expected changes.
  5. Perform a smoke test on the EVAP system to locate large leaks. Examine filler neck seal, vent valve, canister, hoses, and tank seams while introducing smoke.
  6. If smoke test does not reveal leak, pressure-test fuel tank and fuel lines where applicable (follow manufacturer safety procedures for pressurizing fuel system).
  7. If a component (hose, valve, tank, connector) is found leaking or faulty, repair or replace the component and retest. Replace FTP sensor or repair wiring if sensor readings are inconsistent.
  8. After repair, clear codes, run EVAP/self-test cycles, and confirm readiness monitors complete and that P0093 does not return.

Likely causes

  • Loose or missing fuel filler cap or damaged filler-neck seal
  • Disconnected or damaged EVAP hose at the charcoal canister, purge valve, or filler neck
  • Stuck open vent (canister vent) valve or purge valve allowing large venting
  • Cracked fuel tank or leaking fuel line/quick-connect fitting
  • Faulty fuel tank pressure sensor or its electrical connector

Fault status

⚠️ Status
P0093 — Fuel System/EVAP Large (gross) Leak Detected. MIL illuminated; EVAP monitor cannot hold pressure/vacuum. Inspect filler cap, EVAP hoses, valves, tank and FTP sensor.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
160

Browse 160 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

P0093

MITSUBISHI P — Powertrain

Fuel leak problem

Brand: MITSUBISHI
Type: P — Powertrain
Views: UK: 23 EN: 55 RU: 40
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Loose, missing, or damaged fuel filler cap or seal
  • Damaged or disconnected EVAP/fuel vapor hoses or lines
  • Cracked or punctured fuel tank or fuel line
  • Faulty or stuck open EVAP vent (vent) valve or purge valve
  • Leaking charcoal canister or purge system components
  • Fuel tank module or quick-connect leak at fittings

Symptoms

  • Check Engine Light (MIL) illuminated with P0093 stored
  • Strong fuel or vapor odor around the vehicle
  • Failed EVAP system monitor or failed emissions readiness
  • Unable to complete EVAP leak test (EVAP monitor incomplete)
  • Possible visible fuel leak or wet spots under vehicle (if liquid leak present)

What to check

  • Read and record all stored codes and freeze-frame data; note any related EVAP codes
  • Visually inspect filler cap, filler neck seal, and fuel cap condition; confirm cap is tightened and seals intact
  • Inspect EVAP lines, hoses, clamps, and connections for cracks, disconnections or loose clamps
  • Check for fuel odor and visible liquid fuel leaks around tank, lines, and fittings
  • Scan data: monitor fuel tank pressure (FTP) sensor readings and EVAP component statuses during a diagnostic test
  • Operate/command purge and vent valves with a scan tool to verify correct operation and observe system response

Signal parameters

  • Fuel tank pressure (FTP) sensor: when system commanded to hold pressure/vacuum the sensor shows immediate return to atmospheric pressure (no vacuum/pressure hold)
  • Sensor voltage or pressure trend: rapid equalization to ambient instead of gradual change during EVAP test
  • Purge valve: commanded closed but flow/path present (indicates vent or hose leak downstream/upstream)
  • Canister vent (vent) valve: should open/close on command; stuck open allows large leak signature
  • EVAP system monitor state: unable to achieve or maintain commanded pressure/vacuum during self-test

Diagnostic algorithm

  1. Retrieve freeze-frame data and complete DTC history. Note state when code set (fuel level, temperature, recent fueling).
  2. Confirm fuel cap: inspect condition, reinstall and tighten, or replace with known-good cap. Clear code and rerun monitor if appropriate.
  3. Perform a thorough visual inspection of EVAP hoses, fittings, filler neck, tank top, quick-connects and charcoal canister for obvious damage or disconnection.
  4. Use a scan tool to command EVAP vent and purge valves; verify commanded responses and check FTP sensor readings for expected changes.
  5. Perform a smoke test on the EVAP system to locate large leaks. Examine filler neck seal, vent valve, canister, hoses, and tank seams while introducing smoke.
  6. If smoke test does not reveal leak, pressure-test fuel tank and fuel lines where applicable (follow manufacturer safety procedures for pressurizing fuel system).
  7. If a component (hose, valve, tank, connector) is found leaking or faulty, repair or replace the component and retest. Replace FTP sensor or repair wiring if sensor readings are inconsistent.
  8. After repair, clear codes, run EVAP/self-test cycles, and confirm readiness monitors complete and that P0093 does not return.

Likely causes

  • Loose or missing fuel filler cap or damaged filler-neck seal
  • Disconnected or damaged EVAP hose at the charcoal canister, purge valve, or filler neck
  • Stuck open vent (canister vent) valve or purge valve allowing large venting
  • Cracked fuel tank or leaking fuel line/quick-connect fitting
  • Faulty fuel tank pressure sensor or its electrical connector

Fault status

⚠️ Status
P0093 — Fuel System/EVAP Large (gross) Leak Detected. MIL illuminated; EVAP monitor cannot hold pressure/vacuum. Inspect filler cap, EVAP hoses, valves, tank and FTP sensor.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
203

Browse 203 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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