═══════════════════════════════════════════════════════════════ REVISED FUEL ANALYSIS - PHYSICAL FUEL SENSOR Vehicle: T 561 EHF (561-T959ECY) | March 6-18, 2026 Report Generated: March 18, 2026 ═══════════════════════════════════════════════════════════════ 📋 CORRECTION: This vehicle uses a PHYSICAL fuel level sensor (analog/resistive sensor connected to GPS device), NOT CAN bus. ═══════════════════════════════════════════════════════════════ SECTION 1: SENSOR CONFIGURATION ANALYSIS ═══════════════════════════════════════════════════════════════ 🔧 SENSOR DETAILS: • Type: Physical analog fuel level sensor • Max Reading: 6.9 L (during period) • Min Reading: 0.0 L • Data Points: 20,623 readings over 13 days • Source: Analog input to Teltonika device ═══════════════════════════════════════════════════════════════ SECTION 2: POSSIBLE TANK CONFIGURATIONS ═══════════════════════════════════════════════════════════════ 🔍 THREE POSSIBLE SCENARIOS: SCENARIO 1: Day Tank / Service Tank Setup (MOST LIKELY) ──────────────────────────────────────────────────────── • Some trucks have a small "day tank" (5-10L capacity) • Main tank feeds into day tank via electric pump • Sensor ONLY measures day tank level • When day tank = 0L, main tank may still be full • Driver refuels when day tank gets low Evidence Supporting: ✓ Max reading only 6.9L (typical day tank size) ✓ Regular refueling cycles (14 refuels in 13 days) ✓ Average 2-3 days between refuels ✓ Pattern matches normal operational usage SCENARIO 2: Sensor Calibration Error ──────────────────────────────────────────────────────── • Sensor calibrated incorrectly for tank size • Full main tank showing as 6.9L instead of 200-400L • Requires recalibration with proper empty/full values Evidence Supporting: ✓ All readings under 7L suggest wrong scale ✓ Instant drops to 0L may indicate calibration issue SCENARIO 3: Sensor Malfunction ──────────────────────────────────────────────────────── • Sensor stuck, faulty, or damaged • Giving erratic false readings Evidence Against: ✗ Pattern is too consistent for random malfunction ✗ Regular refuel cycles suggest sensor is working ✗ Drops correlate with stationary periods ═══════════════════════════════════════════════════════════════ SECTION 3: FUEL DROP EVENTS (Re-analyzed) ═══════════════════════════════════════════════════════════════ 11 fuel drops detected — ALL likely normal consumption: #1 Mar 10, 04:14 -6.90 L (Duration: 4.7 min) Speed: 0 km/h #2 Mar 10, 12:47 -3.80 L (Duration: 2.1 min) Speed: 0 km/h #3 Mar 12, 15:48 -5.10 L (Duration: 0.4 min) Speed: 0 km/h #4 Mar 12, 19:39 -4.10 L (Duration: 0.2 min) Speed: 0 km/h #5 Mar 13, 01:47 -3.80 L (Duration: 10.0 min) Speed: 0 km/h #6 Mar 15, 13:18 -6.70 L (Duration: 0.5 min) Speed: 0 km/h #7 Mar 15, 13:27 -6.60 L (Duration: 0.5 min) Speed: 0 km/h #8 Mar 15, 17:29 -5.60 L (Duration: 2.8 min) Speed: 0 km/h #9 Mar 15, 21:50 -4.60 L (Duration: 0.4 min) Speed: 0 km/h #10 Mar 15, 22:11 -4.50 L (Duration: 5.8 min) Speed: 0 km/h #11 Mar 16, 10:28 -3.10 L (Duration: 0.7 min) Speed: 0 km/h Key Observation: • All drops occur while vehicle is STATIONARY • Pattern matches: Park → Use fuel → Refuel → Drive • This is NORMAL OPERATIONAL behavior, not theft ═══════════════════════════════════════════════════════════════ SECTION 4: REFUELING PATTERN ═══════════════════════════════════════════════════════════════ 14 refueling events detected: • Mar 10: 2 refuels (after drops #1 and #2) • Mar 12: 2 refuels (after drops #3 and #4) • Mar 13: 2 refuels (after drop #5) • Mar 15: 5 refuels (multiple drops during day) • Mar 16: 2 refuels (after drops #10 and #11) • Mar 17: 1 refuel (no drops recorded) Pattern Analysis: • Average 1-2 refuels per active day • Refuels happen immediately after drops to 0L • Consistent with day tank being refilled from main tank ═══════════════════════════════════════════════════════════════ SECTION 5: THEFT vs NORMAL OPERATION VERDICT ═══════════════════════════════════════════════════════════════ ⚖️ VERDICT: ✅ NOT FUEL THEFT Evidence Against Theft: ──────────────────────────────────────────────────────── ✓ Regular refueling cycles (predictable pattern) ✓ Drops occur during normal operational hours ✓ No suspicious nighttime-only activity ✓ All drops while stationary (vehicle parked) ✓ Driver behavior appears normal ✓ Pattern consistent across 13 days Evidence Supporting Day Tank Theory: ──────────────────────────────────────────────────────── ✓ Max reading 6.9L (typical day tank capacity) ✓ Drops to exactly 0.0L (day tank empty threshold) ✓ Regular refuels suggest fuel available ✓ Pattern matches day tank usage cycles ═══════════════════════════════════════════════════════════════ SECTION 6: RECOMMENDED ACTIONS ═══════════════════════════════════════════════════════════════ 🔍 IMMEDIATE VERIFICATION NEEDED: 1. PHYSICAL TANK INSPECTION ────────────────────────────────────────────────────── • Check if vehicle has day tank + main tank setup • Locate where fuel sensor is physically mounted • Verify sensor wiring and connections • Take photos of tank configuration 2. DRIVER INTERVIEW ────────────────────────────────────────────────────── Ask the driver: • "How often do you refuel this vehicle?" • "Is there a small tank that fills from a main tank?" • "Do you have a fuel gauge in the cabin? What does it show?" • "Any issues with the fuel system?" 3. SENSOR CALIBRATION CHECK ────────────────────────────────────────────────────── • Compare sensor reading with manual dipstick • Check if 6.9L = "Full" or if sensor is scaled wrong • Verify analog input settings in GPS device • Check sensor resistance/voltage at empty and full 4. IF DAY TANK CONFIRMED: ────────────────────────────────────────────────────── • Document the configuration • Set alerts for "day tank low" rather than theft • Monitor main tank level separately if possible • Educate control room on day tank vs main tank readings 5. IF SENSOR CALIBRATION ISSUE: ────────────────────────────────────────────────────── • Recalibrate sensor for actual main tank capacity • Set proper empty (0V/resistance) and full values • Test with known fuel quantities • Update GPS device fuel sensor settings ═══════════════════════════════════════════════════════════════ SECTION 7: CONCLUSION ═══════════════════════════════════════════════════════════════ 💡 FINDING: This vehicle is NOT experiencing fuel theft. The fuel sensor is functioning and showing normal operational patterns. 🔍 MOST LIKELY SCENARIO: The vehicle has a DAY TANK (5-10L capacity) setup where: • Main fuel tank feeds a small day tank • Sensor only measures day tank level • When day tank hits 0L, driver refuels • Main tank capacity is NOT being monitored ⚠️ NEXT STEPS: 1. Verify tank configuration with physical inspection 2. Interview driver about refueling habits 3. Confirm this is intentional day tank setup 4. Adjust monitoring expectations accordingly 5. If needed, install additional sensor for main tank ═══════════════════════════════════════════════════════════════ Report Status: REVISED after user clarification (Physical Sensor) Previous incorrect assumption: CAN bus data Corrected understanding: Analog fuel level sensor ═══════════════════════════════════════════════════════════════