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Home / DTC / P1457 — Unable To Pull Vacuum In Tank

P1457 — Unable To Pull Vacuum In Tank

Detailed page for trouble code P1457.

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Code

P1457

LINCOLN P — Powertrain

Unable To Pull Vacuum In Tank

Brand: LINCOLN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • EVAP canister vent/vent solenoid stuck closed or open (fails to connect the pump to the tank)
  • Faulty vacuum pump or EVAP pump (electrical or mechanical failure)
  • Large leak in EVAP system (loose/defective fuel cap, disconnected hose, cracked line)
  • Blocked/clogged vent line, filler neck, or charcoal canister
  • Collapsed or restricted EVAP hoses or check valves
  • Faulty fuel tank pressure (FTP) sensor or incorrect sensor readings

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Failed EVAP system readiness or failed emission test
  • Possible fuel odor near tank or filler neck
  • No drivability symptoms in many cases (code only)
  • Difficulty filling the tank or fuel nozzle shutting off prematurely (occasionally)

What to check

  • Read freeze frame and pending/stored codes with a scan tool and note related EVAP codes
  • Visually inspect fuel cap, filler neck, EVAP lines, canister and electrical connectors for damage or disconnection
  • Monitor fuel tank pressure (FTP) or EVAP sensor values with scan tool while commanding tests
  • Listen for operation of vent valve and EVAP/vacuum pump when commanded
  • Perform a smoke test to locate leaks or blocked paths
  • Check for continuity/power/ground at vent solenoid and pump connectors

Signal parameters

  • Fuel Tank Pressure (FTP) sensor: kPa or inHg (expected to fall when pump evacuates)
  • EVAP vent solenoid commanded state (ON/OFF) and feedback
  • EVAP purge valve commanded state and measured flow
  • EVAP/vacuum pump current draw or activation feedback
  • Fuel level sensor (high fuel can affect EVAP tests)
  • PCM commanded vacuum pump status and error counters

Diagnostic algorithm

  1. Verify the code and related EVAP codes with a scan tool. Record freeze frame data and readiness status.
  2. Perform a careful visual inspection of the fuel cap, filler neck, EVAP lines, charcoal canister and connectors. Replace or tighten a loose/defective fuel cap.
  3. Using a scan tool, command the EVAP vent solenoid and vacuum/EVAP pump while monitoring FTP sensor. Confirm the vent solenoid opens/closes and the pump energizes.
  4. If the pump does not run or the vent solenoid does not actuate, check power and ground at the component connector and repair wiring or connector faults as needed.
  5. Perform a smoke test into the EVAP system to find leaks, disconnected hoses, or blockage. Pay attention to the filler neck, rollover/check valves and canister inlet/outlet.
  6. If vent valve and pump operate but vacuum is not created, inspect and test hoses for internal collapse or restrictions. Remove and inspect the canister and lines for clogging or liquid contamination.
  7. Test the fuel tank pressure sensor for correct operation (voltage/pressure response). Replace if readings are inconsistent with actual pressure changes.
  8. Replace failed components (vent solenoid, vacuum/EVAP pump, hoses, check valves or canister) based on findings. Clear codes and perform a full EVAP test/drive cycle to verify repair.
  9. If symptoms persist after replacing components and correcting leaks, verify PCM software level/TSBs and consider module or wiring harness diagnosis.

Likely causes

  • Vent/vent solenoid not operating (no path between pump and tank)
  • Vacuum/EVAP pump failed or not energizing
  • Open leak preventing the system from holding a vacuum (loose cap, disconnected hose)
  • Clogged charcoal canister or vent line preventing flow
  • Hose collapsed internally or kinked preventing vacuum transfer
  • Damaged or malfunctioning check/rollover valve at filler neck

Fault status

⚠️ Status
EVAP system vacuum test failed — PCM could not pull vacuum in the fuel tank. Inspect vent valve, vacuum/EVAP pump, EVAP lines, leaks, and FTP sensor.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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166

Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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