The vehicle we are working on is a 2001 VW Jetta equipped with a 2.0 L engine, the steps shown
in this page will apply to the vehicles listed above.
The car was running fine, but one morning it failed to start, the engine was turning over but it wouldn't start.
When the car came to our shop all we knew was that it wouldn't
start, we removed the plastic cover located on top of the engine
to gain access to the spark plug wires, we needed to see if the
vehicle had spark.
We removed one spark plug wire using a set of pliers designed
for that purpose.
Next, we checked for spark using a spark tester, the vehicle
which meant that the problem was not in the
ignition system but it was a fuel
Knowing that our problem was not in the ignition system we
moved to the fuel system, we opened t he fuel tank door and we
removed the gas cap, one of us turned the ignition key on while
the other listened for the fuel pump, since there was no sign of
fuel pump activity we proceeded to check all the fuses located on
the left side of the dash by the door jam as shown in the image.
Since the fuses tested fine we suspected that the problem was
either a bad fuel pump relay or a bad fuel pump, we removed
the cover located under the dashboard on the driver's side to
gain access to the fuel pump relay.
The fuel pump relay is shown in this image, it is the 3rd relay
from bottom on the far left and it is marked with the number
409 (see image), before removing the relay, touch its plastic
case while you turn the ignition switch on, if the relay is
working you will feel and hear a momentary click on and
another off, within a couple seconds, this is done to
pressurize the fuel system before you start the car.
In the vehicle we are working on the relay wasn't working
at all, and since we had access to a new relay we chose to
swap it to see if that was our problem.
To remove the fuel pump relay just pull it out gently, it should
off without excessive effort, we installed the new fuel pump
this vehicle and solved its problem, the fuel pump started
properly, there was no need for us to by-pass the fuel
pump relay to
send power to the fuel pump, we will illustrate
how to by-pass the relay
in future pages when we get a vehicle that
has a bad fuel pump, in this
particular case all the vehicle needed
was a new fuel pump relay.
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