[fiily]

Do the 3 wire dme relay jumper and if the car runs, replace your DME relay again. Check the mechanics install of the fuel pump/filter, it seems very coincidental that he replaced it and immediately afterwards the car no longer runs.

Do the free troubleshooting, and don't start throwing $$$ at the no start issue until you figure out what the real issue is as many have done previously. Reading threads of people replacing every single related item to a non-start when a majority of the time its the DME, DME relay, bad fpr.

If the car doesn't start doing the 3 wire trick below and you have triple checked the mechanics work, and all of your fuses , your DME would be the next likely suspect.

The reason why I highlighted the stuff in red is because of this statement "That mechanic says the pump is working. Since they are not familiar with a Porsche I am reaching out to you for information. " ---> Doesn't fix porsche's to me means doesn't know how to diagnose them. Bring the car to an porsche Indy shop, and we don't mind the challenge either of troubleshooting.

Emergency Repairs

If you suspect the DME relay is bad and you need to move the car, you may install do so by installing an "emergency" jumper across terminals 30, 87, and 87b on the relay / fuse panel. Some folks will tell you to jumper terminals 86, 87, and 87b instead. This allows you to only run the fuel pump, DME, and injectors when the ignition switch is turned on. Seems like a great idea on the surface. However, realize that the wire supplying power from the ignition switch to terminal 86 on the DME relay is a 1.0 mm wire and is only intended to carry enough current to pickup the primary coil on the relay. The wire connected to terminal 30 is a 4.0 mm wire which is designed to carry full current demanded by the fuel pump, DME, and fuel injectors. I strongly recommend using terminal 30 instead of terminal 86 to supply power via the jumper.
The emergency jumper consists of three leads with male spade connector on each lead (shown below).


Emergency Jumper
To start the car using the emergency jumper, install the jumper in the following sequence:
Install one spade connector into terminal 87.
Install the second spade connector into terminal 87b.
Install the last spade connector into terminal 30. When the connector is installed into terminal 30 you should hear the fuel pump energize. The car can then be started using the ignition switch.