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George H.
George H., Hyundai Technician
Category: Hyundai
Satisfied Customers: 2026
Experience:  Hyundai Gold certified, ASE Master tech 15+ years
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My Hyundai H-1 mini-bus has a "knock sound" from diesel

Customer Question

My Hyundai H-1 mini-bus has a "knock sound " from diesel engine.I did a diagnostic test about a month ago.The result of the test is "Low Fuel Pressure".So far i have changed 4 injectors,but still have problem.
Thank you
Steven Bipat.
Submitted: 2 months ago.
Category: Hyundai
Expert:  Kevin replied 2 months ago.

Hi im Kevin has fuel filter been replaced recently ?

Customer: replied 2 months ago.
Kevin the fuel filter has been changed about a week ago.Thank You
Steven Bipat.
Expert:  Greg replied 2 months ago.

Hi Steven .

How many miles on this engine.

Which engine do you have the 4M41 or the 4d56

When you have a knock and you have a low fuel pressure code then most times on the engine it

as it says fuel pressure weak and not enough pressure getting to the engine and this will cause a knock .

Let me know which engine you have in this H1 ..

Rgds Greg

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