The document discusses troubleshooting the fuel pump in a Mercedes-Benz, emphasizing the importance of the fuel pump relay in maintaining positive pressure for gasoline supply. Signs of a failing fuel pump relay include car starting issues, strange engine behavior, check engine light activation, and unusual noises from the fuel tank. It advises to test and replace a defective fuel pump relay to prevent engine disruption.

1. How To Troubleshoot

2. The fuel pump
maintains positive
pressure for a
steady supply of
gasoline to the
engine.

3. It is regulated by
a relay.

4. Interruption in
power supply to
the fuel pump due
to a bad relay can
kill the engine of
your car.

5. So, signs of fuel
pump relay failure
in your Mercedes-
Benz should not
be neglected.

7. Factors
responsible for
fuel pump relay
failure in
Mercedes-Benz;
• Short circuit
• Power surge
• Dust accumulation
• Bad ignition
control module

9. Car Not Starting

10. A defective fuel
pump relay can
disrupt the fuel
supply to the
combustion
chamber.

11. As a result of
which, you might
not be able to
start the engine of
your Mercedes-
Benz.

12. Strange Engine Behavior

13. Inconsistent fuel
supply can make
your Mercedes-
Benz engine
exhibit strange
behaviors.

14. Frequent stalling,
engine misfire,
rough idling are
the most common
signs of a bad fuel
pump relay.

15. Check Engine Light

16. Disruption in fuel
supply due to a
bad fuel pump can
adversely affect
the engine
operation.

17. When the onboard
computer detects
the problem, it
would turn on the
check engine
light.

18. Strange Noise

19. If you hear strange
scary noise coming
from the fuel
tank, then it's a
sign of a bad fuel
pump relay.

20. Besides, a
defective fuel
pump can also
make strange
noises.

22. A defective relay
can make your
Mercedes-Benz
fuel pump
struggle.

23. So, signs of fuel
pump failure in
your car should
not be neglected.

24. Test it, if it’s
defective, then
get it replaced.

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