I have a 78 front wheel drive wagon, I' m trying to follow the wiring schematic , I have no power to the fuel pump, there is no power to the regulator .Where do I trace back to next?

Alternator and fusible links.

I had fuel pump issues myself and this is what I found out:

 

Found out the fuel pump is powered from voltage regulator. After doing more troubleshooting with a volt meter I found while the engine was running the fuel pump was getting no power. According to electrical drawings the power for the fuel pump comes from the voltage regulator output labeled "H". I also bought a in-line fuel gauge to check for fuel pressure at the carb which was also showing zero confirming the pump was not running correctly. I took the cover off the VR and started the car again while monitoring the VR coils. Neither one of them where cycling as they should (no cycling at all). The VR gets it's power from the alternator so thats where I went next. I put my volt meter directly on the battery which measured 12V when the car was not running. Once I started it (even for the 20 seconds) it was long enough for me to see that the voltage stayed at 12V instead of the 14V which is expected while car is running (alternator should put out 14V). This told me my alternator was bad.

 

Changed the alternator out, the VR began to work suppling proper voltage to fuel pump which supplied about 3# of fuel pressure to carb curing my problem

 

Hope this helps....pete