Correct answer: D. Bleed the air out of the fuel system.
The fuel system can become air-locked if you let the fuel get too low or if there is a leak in the system. You should have the problem corrected before driving. The solution may be as simple as bleeding the fuel system to release the air.
This is an official-style question from the Technical Matters topic of the Ireland driver theory test (Cat. B). Practise all 807 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.
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