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Symptom

Engine cuts out when fuel is low

Hesitation, loss of power or cutting out that arrives at roughly the same point on the fuel gauge every time and is cured completely by filling up — often brought on by cornering, braking or a climb at that level. Worth reporting precisely, because it is very nearly a diagnosis on its own: many tanks are moulded in two halves around a propshaft or exhaust, with a second pump moving fuel across, and when that pump fails the car starves with the other half still full. The complaint is routinely investigated as a failing main pump, a blocked filter or a sensor, all of which then test perfectly.

Also described as: cuts out at quarter tank, stalls when low on fuel, runs out with fuel in it, dies when tank is low, splutters when low on fuel, loses power below half a tank, با باک کم خاموش میشود, وقتی بنزین کم است خاموش میکند, se apaga con poca gasolina, se para con deposito bajo, falla con poco combustible, تطفي لما البنزين يقل, تفصل والخزان فاضي, تطفي على الاحتياطي

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What this usually means

This is very nearly a diagnosis before anyone opens the bonnet, and the reason is the shape of the tank. Many tanks are moulded in two halves that straddle a propshaft tunnel or an exhaust, with the pickup and main pump in one half and a small transfer pump moving fuel across from the other. When that transfer pump fails, the car starves with the second half still full — and the gauge, which usually reads both halves, shows fuel remaining.

That is why the complaint is so consistently misdiagnosed. It presents as fuel starvation, so the main pump, the filter and the level sender are all investigated — and all three test perfectly, because none of them has failed. The car is then returned with no fault found, and starves again at the same point on the gauge.

The pattern is the evidence and it is very specific. It arrives at roughly the same gauge reading every time. It is brought on by cornering, braking or a climb at that level, because those are what let the pickup uncover. And filling up cures it completely, immediately, every time — which is the observation to ask for directly, because drivers frequently do not mention it, having assumed it obvious.

A simpler version exists and should be excluded first: a pickup strainer partly blocked, or a level sender reading high so the driver believes there is more fuel than there is. Both produce starvation near empty; neither survives filling the tank either.

Working through it

  • Starves at roughly the same gauge reading each time, cured by filling up

    Likely cause
    Failed transfer pump in a two-part tank — fuel is trapped in the half the main pump cannot reach
    How to confirm it
    Establish the pattern precisely: the level, the manoeuvre, and that filling cures it. Check whether the vehicle has a two-part tank before testing anything else — that fact settles most of it.
    What fixes it
    Renew the transfer pump or its jet pump. The main pump is not the fault and replacing it changes nothing.

  • Cuts out on cornering, braking or a climb, only when low

    Likely cause
    The pickup uncovering as fuel moves away from it
    How to confirm it
    Note which manoeuvre and which direction. Consistency in direction points at where the fuel is going and which half is empty.
    What fixes it
    Renew the transfer pump, or repair the pickup and its surge pot where fitted.

  • Gauge reads higher than the fuel actually present

    Likely cause
    Level sender reading incorrectly, so the driver is running the tank lower than they believe
    How to confirm it
    Compare the sender's live value against a measured fill. A sender's track wears in the position it spends most of its life in.
    What fixes it
    Renew the sender. The starvation is genuine but the fault is the gauge, not the delivery.

  • Fuel pressure falls away only when the tank is low

    Likely cause
    A partly blocked pickup strainer that flows adequately when submerged and not when the level drops
    How to confirm it
    Gauge pressure at low level under load, not at idle with a full tank. Inspect the strainer when the pump is out.
    What fixes it
    Renew the strainer, and investigate tank contamination — a blocked strainer implies debris.

  • Cuts out at low level with no cornering involved, on a diesel

    Likely cause
    Air being drawn into the supply as the level falls, which a diesel system tolerates far less than a petrol one
    How to confirm it
    Look for air in a clear section of the supply line during the fault. Check the tank pickup and every union between tank and pump.
    What fixes it
    Repair the air ingress and prime the system properly. Diesel systems do not clear air on their own.

Codes that produce this symptom (7)

Listed with the codes that most typically present this way first — the likeliest place to start.

Information, not instruction

CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.

Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.

Others with this symptom

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What makes one worth reading:

  • The car — make, model, year and engine. The same fault behaves differently on each.
  • What you measured, not only what you replaced.
  • What actually fixed it — or that nothing did, which is worth knowing too.

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