Power to the fuel pump is turned on and off by the fuel pump relay. But how can you tell if the fuel pump relay isn't working properly? Continue reading to learn about the most common indicators!
The
fuel pump relay turns on the fuel pump's electricity when it's time to raise
the fuel pressure in the rail. Every time you switch on your car's ignition,
the fuel pump relay is engaged.
Check MOT expiry date for your
car and have any starting problems addressed by a qualified mechanic if
necessary to avoid a MOT refusal.
If
your car won't start or keeps cutting out, the MOT tester won't be able to
perform all the necessary tests, which is why they won't finish the MOT
inspection or checks on your vehicle.
An
engine that stalls or cuts off is the most typical sign of a faulty fuel pump
relay. Your dashboard will likely display these warnings in addition to the
check engine light.
According
to the MOT
history checker, oneof the most common reasons for a MOT tester to fail
a MOT test is due to the engine management light being illuminated on the
dashboard.
The
fuel pump relay might malfunction for a variety of reasons. We will go over the
signs that your fuel relay has failed and its location. Let's start by giving a
brief rundown of the warning indicators.
As
mentioned earlier, if you come across any of the following faulty fuel pump
relay symptoms, check
MOT status for your car and have your mechanic carry a fuel pump relay
replacement to avoid a MOT failure/refusal.
A
fuel pump relay's condition can be impacted by a variety of factors, including
dust and electrical power fluctuations.
These
are the most typical signs of a malfunctioning fuel pump relay, listed in more
depth:
1. Engine Management Light -
When the check engine light comes on, the engine control module also known as
ECU continuously examines all of the engine's sensors to make sure they
are not sending false information. If the ECU notices an inaccurate reading
from any sensor, the engine management light will come on.
The engine management light is another frequent indicator of a
malfunctioning fuel pump. Check MOT
history online for your vehicle to see if this has ever happened to it
and resulted in a MOT test failure. The ECU monitors the fuel pressure via the
fuel pressure sensor. If the fuel pump relay breaks unexpectedly, the check
engine light will illuminate and a trouble code referring to fuel pressure will
be recorded.
2. Difficult Acceleration - A
malfunctioning fuel pump relay can reduce the fuel pump's power and reduce the
amount of fuel delivered to the engine. Just like a person's heart beats on
blood and oxygen, so does an engine. Therefore, any difficulties with the fuel
pump relay may impact the fuel flow to the combustion chamber, which may result
in starting issues for your car. Although, there are a number of other causes
for this, like a clogged fuel filter, you should generally get your car
mechanic to thoroughly inspect your vehicle before making any repairs.
3. Engine Stalling - The
fuel pump relay may abruptly break the relay connection and stop powering the
fuel pump if it has any faulty soldering’s. If the fuel or pressure in the
combustion chamber is insufficient, the engine shuts down. The fuel pump is the
component that makes sure none of this occurs, and if the fuel pump relay
experiences any problems, it will not operate as intended.
4. Engine Is Fully Dead - A
malfunctioning fuel pump relay might potentially leave the engine completely
dead and unable to start. Your engine won't start if there is no fuel pressure,
and if the fuel pump relay fails, there would be no power to the fuel pump to
provide fuel pressure.
5. No Sound from Fuel Pump - The
fuel pump should make a whirring sound when the ignition is turned on in the
ignition lock, however there is no sound coming from the fuel pump. This
indicates that the fuel pump began increasing the fuel rail's fuel pressure. If
you are unable to hear this, the fuel pump relay may be malfunctioning. After
turning on the ignition, spend a few seconds paying careful attention to the
area around the fuel tank for any noise.
Where is the Fuel Pump Relay Located?
In
most car types, the fuse box under the dashboard or the fuse box in the engine
compartment houses the fuel pump relay.
A
lengthy, black box with multiple fuses and relays, including one for the fuel
pump, is typically the fuse box for the engine or dashboard. For different
autos, the fuel pump relays could be mounted in different places.
Consult
your vehicle's owner's manual to identify the fuel pump relay's precise
placement quickly.
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