Wrong Tank, Wrong Time
Fuel starvation in the DA40 — when the selector says LEFT and the engine says nothing
The scenario
Departing St. Petersburg–Clearwater International (KPIE), Runway 36, on a local VFR training flight. Elevation 11 ft MSL. Class D airspace, tower in operation. Tampa Class B begins at 1,200 ft MSL overhead — you'll stay below it for the local area.
Aircraft: Diamond DA40, solo, within weight and balance limits. The DA40's Lycoming IO-360-M1A is fuel-injected — there is no carburetor heat. Fuel selector has two positions: LEFT and RIGHT. There is no BOTH. The constant-speed prop requires active RPM management. G1000 glass panel.
The scenario: You preflighted in a hurry this morning — you were running late, a friend was waiting, and you did a quick walkaround. You visually checked the tanks and they looked fine. You noted the fuel selector was on LEFT from the previous flight and left it there. The left tank had 12 gallons; the right had 22 gallons. You did not switch to the fuller tank before departure.
Forty minutes into the flight, cruising at 2,500 ft MSL northwest of the field, the engine begins to run rough, then loses power entirely. You are over the coastal area north of KPIE, roughly 7 nautical miles out on the 351° radial — the same heading as Runway 36. Tampa Bay and open water are visible to your left. Ahead and below: a mix of low-density residential and open water.
- {'label': 'Field', 'value': 'KPIE · St. Petersburg Clearwater'}
- {'label': 'Runways', 'value': '4/22 · 18/36'}
- {'label': 'Elevation', 'value': '11 ft'}
- {'label': 'Aircraft', 'value': 'DA40'}
- {'label': 'Dominant phase', 'value': 'Takeoff / Landing'}
The decision
The engine just quit. Before you act — which of these are already in your head? (Pick all that apply; this records your mental model before the decision tree.)
What the record shows
What the NTSB files show
Fuel starvation from selector mismanagement is one of the most preventable accident causes in general aviation — and one of the most consistent. The NTSB files for ERA12FA002, ANC17LA043, LAX97LA278, and LAX98LA168 all share the same probable cause language: the pilot failed to verify fuel selector position before flight or failed to manage tank selection per procedure, resulting in fuel starvation and total loss of engine power. These events occurred at other locations — not at KPIE — but the mechanism is identical regardless of field.
The Diamond DA40's fuel system demands active management. Unlike a Cessna 172 with a BOTH position, the DA40's LEFT/RIGHT selector means the pilot must consciously choose which tank is feeding the engine and must monitor quantity on each side. Departing on a tank with 12 gallons when 22 gallons are available on the other side — and not switching — is the setup for this scenario.
The G1000 engine page is not subtle: fuel flow drops to zero, fuel quantity on the selected tank approaches empty, and the other tank shows full. The information is there. The accident happens when the pilot does not look, does not act, or does not connect what they see to what they should do.
The terrain north of KPIE — the Runway 36 departure corridor at 351° — is predominantly open water and open developed land. This is a ditching environment. Pilots operating out of KPIE should brief this reality before every departure on Runway 36: if the engine quits on climbout or in the local area to the north, the forced-landing outcome is likely a water landing. A prepared ditching in the DA40 is survivable. An unprepared one, or one into dense residential terrain, may not be.
Key lesson — The DA40 fuel selector has no BOTH position. Verify selector position and select the fuller tank before every departure. The G1000 engine page tells you the fuel state in real time — use it. A fuel-starvation engine failure is not a systems failure; it is a procedural failure, and it is entirely preventable.
Debrief — teaching points
The DA40 has no BOTH — LEFT/RIGHT is an active management task.
The Lycoming IO-360-M1A in the DA40 feeds from whichever tank the selector points to — and only that tank. There is no BOTH position. This means fuel starvation from a mis-set or depleted selected tank is a real and recurring risk. Before every departure, verify the selector position, check the quantity on the selected tank, and consider whether to switch to the fuller tank. Before landing, verify the selector is on the tank with more fuel. This is not optional — it is the fuel management discipline the airplane demands.
Aviate first: pitch for 73 KIAS before troubleshooting.
When the engine quits, the first action is to establish best glide — 73 KIAS in the DA40 at gross weight. The composite DA40 airframe is aerodynamically clean; if you do not pitch for best glide immediately, you will trade altitude for airspeed you do not need. At 2,500 ft AGL, every 100 ft of unnecessary altitude loss costs you roughly 0.1 nm of glide range. Establish 73 KIAS, then troubleshoot. Aviate, navigate, communicate — in that order.
Fuel-injected restart after starvation requires the boost pump.
The IO-360-M1A is fuel-injected. After fuel starvation, switching tanks alone is not sufficient — the fuel-injection system must be re-primed. The boost pump is required to restore fuel pressure and enable restart. The restart sequence: fuel selector to the tank with fuel, mixture RICH, boost pump ON, throttle as required. Skipping the boost pump means the engine will not restart even with fuel available. Know this procedure before you need it.
The G1000 engine page is your real-time fuel management tool.
The G1000 displays fuel flow, fuel quantity per tank, and engine parameters continuously. In this scenario, the engine page showed fuel flow at zero and the right tank at 22 gallons while the left tank was depleted — the cause was visible before the engine quit, and it was visible the moment power was lost. Scan the engine page as part of your regular cruise scan. If fuel flow drops unexpectedly, check the selector immediately. The information is there; the discipline is using it.
Know your off-field environment before you depart — north of KPIE is a ditching environment.
The terrain north of KPIE on the Runway 36 departure corridor (351°) is predominantly open water and open developed land. If the engine quits on climbout from Runway 36 or in the local area to the north, the forced-landing environment is water. Brief this before every departure: 'If I lose the engine on Runway 36 climbout, I am ditching.' A prepared ditching — MAYDAY transmitted, 7700 squawked, slowest possible touchdown speed with flaps LDG, master off before contact — is survivable. An unprepared one, or a turn back to the field from low altitude, is not.
Built from the real accident record
Composite scenario built from NTSB fuel-starvation events ERA12FA002, ANC17LA043, LAX97LA278, LAX98LA168. Localized to KPIE and the Diamond DA40. Real events occurred at other locations.
NTSB reports: ERA12FA002 · ANC17LA043 · LAX97LA278 · LAX98LA168
ACS tasks: PA.II.A — Pilot Qualifications / Preflight Preparation · PA.II.B — Weather Information · PA.II.D — Cross-Country Flight Planning · PA.IX.C — Emergency Approach and Landing · PA.I.H — Human Factors
Relevant FARs: §91.3 · §91.13 · §91.151
Step through the full decision tree, make the calls, and see where each choice leads — then debrief it with your CFI.
Open the interactive scenario →All sample scenarios · More Diamond DA40 scenarios · More scenarios at KPIE