Fuel Pump runs constantly., Relocated and rewired by PO. |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Fuel Pump runs constantly., Relocated and rewired by PO. |
Crash207 |
Jun 8 2011, 05:10 PM
Post
#1
|
Newbie Group: Members Posts: 17 Joined: 23-May 11 From: United States Member No.: 13,108 Region Association: Rocky Mountains |
Hey guys.
73 1.7 D-Jet. 3 port Bosch fuel pump (now located under the fuel tank) runs constantly and is a bit loud. I read that it is supposed to run for 1-1.5 seconds and stop with key on engine off. Checked wiring and found it is wired directly to Fuse #8 on the fuse panel. Where should it be wired? Side note. Car sat for 5 years before i rescued it and the fuel pump had power but didn't run until i whacked it a few times. Thanks in advance, You guys are awesome and your expertise is much appreciated. |
Tom |
Jun 9 2011, 10:13 AM
Post
#2
|
Advanced Member Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None |
Rich said, "All electrical power is diverted to the starter when cranking...all of it."
Rich, This is not true, and you say it is not a safety issue, well I would disagree. It would certainly be a safety issue if the pump ran all of the time and you had a fuel leak. Just turning the key to on could cause a lot of fuel on the ground rather quickly, don't you think. Look at the relay board schematic. Follow the yellow wire trace from pin 6 of the 12 pin connector. It also goes to the ECU to allow ground to appear at pin 86 of the fuel pump relay. So, among other things, such as the coil, the fuel pump is powered up at start, not just the starter. Tom |
Lo-Fi Version | Time is now: 14th June 2024 - 10:40 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |