SOURCE: golf gti mk3 fuel pressure problem
The fitting on the fuel rail or you will have to use a adapter to the output side of the fuel filter
SOURCE: 1986 golf gti 8v fuse problem
trace the wiresback 2 to the fuel pump. checks for nics n the wire for shorting out. check the relay and fuse for corrosion . relay may be bad
SOURCE: how to replace tail light on VW golf mk5 estate
Although you posted this question under a 03 VW Golf and you have a MKV. The best I can do is a MKIV set up. From the rear trunk there are access ports just for this job. The right port will be just above the light housing you will find a wire harness for the right assembly. Follow the harness and it will lead you to the assembly. Once located you can squeeze the two tabs and pull the circuit board where the bulbs are installed. Push on the bulb and twist anti-clockwise then pull out of the socket.
The left should be the same procedure and it is located behind your audio components.
NOTE: It's a good idea to wipe your hand and the glass bulb, leaving oily residue will cause early bulb failure once in operation.
SOURCE: 2005 golf mk5 1600fsi low
Check for a fuel pressure regulator. If you are testing the pressure at the end of the line, the fuel has already passed through the regulator. I'd be willing to bet the pressure coming from the pump(s) directly is up to snuff.
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