I had that problem, fuel pump relay, after driving 10 minutes or more .Check to see how hot your fuel pump relay is. It is located in your fuse block. Under dash left side. 2 large relays in centre, 2 small outer, it is the large one on the right. after driving touch it and if it burns the tip of your finger, mine did i replaced it and now it starts every time.
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my 1988 towncar used to stop running on the open road at 70 mph after 20-25 miles of driving.......after sitting on the side for a 1/2 hr it was start right back up like nothing happened. After 2 frustrating weeks and 3 different mechanics I found out through another towncar owner that the ignition coil is getting hot and is causing the engine to shut off...Lo and behold 28.00 and 20 mins solved the problem. Just invest in a good Ignition coil from NAPA or SUMMIT PARTS
If you're SURE you got all the wires on the correct way, then one or some of the wire leads are possibly not attached to the plug itself firmly. Or attached to the Cap correctly. Possibly old piece of wire left on plugs.
Your volkswagen has an external fuel pump under the car near the tank... the filter shold also be mounted there... They are on a timer, they will actuate during engine cranking... Have someone crank the engine (as in trying to start it) and you should be able to hear the pump operate... if it doesn't , check for power with a test light... the polarity is typically marked on bosch pumps... if you have power, and no pump sound.... u need a pump. CIS injection systems turn to **** when they sit a long time, drain the tank (alot of german cars have drain plugs, or take the hose at the pump off and put fresh fuel in it...