diff --git a/resources/tester/test_b09_fuel_kind_vibrator.py b/resources/tester/test_b09_fuel_kind_vibrator.py
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+++ b/resources/tester/test_b09_fuel_kind_vibrator.py
@@ -0,0 +1,96 @@
+"""연료 종류(휘발유) · 콘크리트 진동기 — 2026-09-14 브레인 661 뒤 ①②.
+
+② 운전경비표 `fuel_kind` 를 조립이 안 읽어 **휘발유 기계에 경유값**이 붙고 있었음(플레이트 콤팩터 ·
+   진동기 · 믹서 · 래머 · 커터) — 종류대로 그 유가(전국·시도 둘 다)로 섬.
+① 콘크리트 진동기 — 원문 8-3 (4611) 두 줄이 한 칸에 뭉쳐 규격·손료계수가 비었음 → 원문값 되살림
+   (전기식 플렉시블형 ø45(0.75㎾) 4,935 · 엔진식 플렉시블형 ø45(2.6㎾) 5,101). 산림 12-15 「봉상후렉시블(45mm)
+   Q=5.4㎥/hr」 은 전기·엔진을 안 적음 → 12-34-1 「콘크리트 진동기(3.5HP)」(= 2.6㎾) · 운전경비표에 엔진식만
+   있는 것을 근거로 엔진식 4611-0350. 집수정 구체콘크리트 갈래가 이제 섬(㉯ ⑴ 조건이 풀림).
+"""
+
+from __future__ import annotations
+
+import json
+from decimal import Decimal
+from pathlib import Path
+
+from B09_Estimation.B09_Estimation_UnitPrice import cached_build, detail_of
+
+ROOT = Path(__file__).resolve().parents[2]
+DATA = ROOT / "resources" / "data_cost_input_value"
+
+
+def _oil(file: str, key: str) -> dict:
+    return json.loads((DATA / file).read_text(encoding="utf-8"))["variables"][key]
+
+
+def test_휘발유_기계는_휘발유값_경유_기계는_경유값() -> None:
+    book = cached_build().book
+    fuels = {r.ref_code for r in book.details["X-1730-0015"] if r.ref_code.startswith("M-FUEL-")}
+    assert fuels == {"M-FUEL-휘발유"}, fuels
+    gasoline = Decimal(str(_oil("oil_2026-08-14.json", "oil_gasoline")["value"]))
+    assert book.titles["M-FUEL-휘발유"].slots[-1] == gasoline or gasoline in book.titles[
+        "M-FUEL-휘발유"
+    ].slots
+    diesel_rows = {r.ref_code for r in book.details["X-0201-0070"] if r.ref_code.startswith("M-FUEL-")}
+    assert diesel_rows == {"M-FUEL-경유"}
+
+
+def test_시도를_고르면_휘발유도_그_시도값() -> None:
+    records = _oil("oil_regional_2026-09-09.json", "oil_gasoline")["records"]
+    seoul = next(Decimal(str(r["value"])) for r in records if r["sido_code"] == "01")
+    book = cached_build(fuel_region="01").book
+    assert seoul in book.titles["M-FUEL-휘발유"].slots
+    assert "서울" in book.titles["M-FUEL-휘발유"].spec
+
+
+def test_기계_하나_시간당_사용료도_연료_종류대로() -> None:
+    from B09_Estimation.B09_Estimation_MachineOperating import hourly_cost_of, load_fuel_price
+
+    gasoline, _ = load_fuel_price(kind="휘발유")
+    diesel, _ = load_fuel_price()
+    assert gasoline != diesel
+    cost = hourly_cost_of("1730-0015")  # 휘발유 1.0 L/hr · 잡품 20%
+    assert cost.money.material == Decimal("1.0") * Decimal("1.2") * gasoline, cost
+
+
+def test_진동기_원문값_되살림() -> None:
+    from B09_Estimation.B09_Estimation_MachineCost import load_machine_catalog
+
+    machines = load_machine_catalog().machines
+    assert machines["4611-0350"].specification == "엔진식 플렉시블형 ø45(2.6㎾)"
+    assert machines["4611-0350"].loss_coefficient_per_hour == Decimal("0.0005101")
+    assert machines["4611-0075"].specification == "전기식 플렉시블형 ø45(0.75㎾)"
+    assert machines["4611-0075"].loss_coefficient_per_hour == Decimal("0.0004935")
+
+
+def test_집수정_구체콘크리트_갈래가_엔진식_진동기로_섬() -> None:
+    build = cached_build()
+    rows = {r["ref_code"]: Decimal(r["quantity"]) for r in detail_of(build, "B-FP-12-15#구체콘크리트")["rows"] if r.get("ref_code")}
+    assert rows["X-4611-0350"] == Decimal(1) / Decimal("5.4"), rows
+    left = " ".join(build.unattached.get("FP-12-15", []))
+    assert "봉상후렉시블" not in left and "구체콘크리트" not in left, left
+
+
+def test_진동기_별칭_사유에_12_15_는_전기_엔진을_안_적음() -> None:
+    from common_util.common_util_aliases import load_aliases
+
+    row = next(r for r in load_aliases("resource") if r["to"] == "4611-0350")
+    assert row["scope"] == "FP-12-15"
+    assert "전기·엔진을 안 적음" in row["basis"] and "12-34-1" in row["basis"], row
+
+
+def test_중기경비_장은_갈래대로_잡품과_손료계수() -> None:
+    """661 뒤처리 — `#암석` 장이 조합 16%·비암석 계수로 보이던 자리."""
+    from B09_Estimation.B09_Estimation_MachineExpenseSheet import machine_expense_sheets
+
+    build = cached_build(dump_haul_m=("164.23",))
+    sheets = {s["code"]: s for s in machine_expense_sheets(build)}
+    rock, combined = sheets["X-0201-0070#암석"], sheets["X-0201-0070#조합"]
+    assert rock["misc_material_percent"] == sheets["X-0201-0070"]["misc_material_percent"]
+    assert combined["misc_material_percent"] == "16"
+    assert rock["loss_coefficient"] == 2405 and sheets["X-0201-0070"]["loss_coefficient"] == 2085
+    gasoline = next(s for s in sheets.values() if s["machine_code"] == "1730-0015")
+    assert Decimal(gasoline["fuel_price_per_liter"]) == Decimal(
+        str(_oil("oil_2026-08-14.json", "oil_gasoline")["value"])
+    )