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Hard To Start After Refuelling

A petrol car that is hard to start or idles roughly just after filling up often has a purge valve stuck open, letting fuel vapour flood the intake.

Normal risk

Not dangerous, but have it checked; it often comes with an EVAP code.

Short answer · Why is my car hard to start right after filling up?

Refuelling pushes a lot of vapour into the charcoal canister. If the purge valve is stuck open, that vapour flows straight into the engine and makes the mixture too rich to start easily. Overfilling past the first click makes it worse because liquid fuel can reach the canister.

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Safe checks you can do

  1. Stop at the first clickDo not keep topping up after the pump nozzle clicks off.
  2. Read the codesEVAP or rich mixture codes support a purge valve fault.
  3. Press the accelerator slightly while startingIf the manual allows it, this can clear a rich condition.

Questions that narrow it down

  1. Only right after refuelling?Purge valve or canister.
  2. Do you top up past the click?Overfilling damages the EVAP system.
  3. Is there a fuel smell?Vapour escaping.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Purge valve stuck openThe most common cause.
  2. Saturated charcoal canisterFrom overfilling.
  3. Leaking injectorHot restarts are also difficult.

Questions about Hard To Start After Refuelling

Is it bad to overfill the tank?

Yes, it can push liquid fuel into the EVAP system.

Is a purge valve expensive?

It is usually a moderately priced part and quick to replace.