1988 Porsche 928 FUEL PUMP REPLACEMENT

1988 PORSCHE 928
100,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
MEL PUMPHREY
  • MEMBER
  • 1 POST
OLD ELECTRIC FUEL PUMP WAS VERY NOISY, DECIDED TO REPLACE IT. ORDERED NEW FUEL PUMP (BOSCH) INSTALLED IT & THE CAR WOULD'NT START. WHEN THE IGNITION WAS TURNED ON, THE NEW FUEL PUMP WAS'NT RUNNING. I REMOVED THE NEW FUEL PUMP FROM THE CAR AND TESTED IT USING A 9 VOLT BATTERY. THE NEW PUMP WAS'NT RUNNING. USING THE SAME 9 VOLT BATTERY I FOUND THAT THE OLD ONE WOULD WORK. RE-INSTALLED THE OLD ONE BACK IN THE CAR. WHEN CRANKING THE ENGINE, THE OLD ONE IS WORKING BUT, THE CAR WILL NOT START. NEW FUEL PUMP RELAY WAS INSTALLED AND THE 15 AMP FUSE IS GOOD. I CAN'T FIGURE IT OUT, CAN YOU? MUCH THANKS IN ADVANCE FOR ANY ASSISTANCE
Sep 28, 2010 at 2:46 PM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
The old one comes on but still will not start -check the fuel pressure-also are you getting spark? Double check the fuel pump connector-
Sep 28, 2010 at 5:36 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.