 1972 1.7 - Fuel pump not starting when key is turned, Problem with fuel pump |
|
|
|
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. |
|
|
| itsmagic |
 Aug 8 2014, 10:46 AM
Post
#1
|
|
Newbie  Group: Members Posts: 10 Joined: 3-June 05 From: Hyde Park, NY Member No.: 4,193  |
My 1972 1.7 914 recently decided to not start. I quickly noticed that the fuel pump is not running briefly like it should after the ignition key is turned. I verified that the relays on the relay board (Master, Fuel Pump, Blower) are all good by trying them on the headlight motors. I then verified that the two fuses on the relay board are good. Next, I popped the cap on the fuel pump relay and pressed it... the fuel pump runs when I do this. (The car will then start and run for a few seconds if I start it). Sooooo, I am at a loss... The fuel pump is fine, relay board is fine, relays are fine... what could be causing the fuel pump to not activate? Thank you for any advice. Wayne
|
   |
 
|
  |
Replies
| Chris Pincetich |
Sep 14 2014, 09:01 PM
Post
#2
|
|
B-) Group: Members Posts: 2,082 Joined: 3-October 05 From: Point Reyes Station, CA Member No.: 4,907 Region Association: Northern California |
I AM GOING THROUGH THE EXACT SAME THING as Wayne, who started this thread. (IMG:style_emoticons/default/sad.gif)
I thought it was a bad relay board, and have tried several other boards without finding my fix (Thanks Bruce for sending them!). I just learned about and tried the exposed relay test, and it did work, which means my relay board should be fine. With the relay innards exposed, I turned the key in the ignition to ON then pressed the relay and the fuel pump started running. I have also cleaned all the relay connections on the board, cleaned the relays, tried several working relays, and bending the relay prongs for a tighter fit. Still no power to the fuel pump! (IMG:style_emoticons/default/dry.gif) Does this mean it's time to swap out and try a new ECU brain?? I've been driving the 914 for over a week with the fuel pump wired directly to the battery. I have to unhook the battery every time I park. Is using a modified relay, one that is "always on," a bad idea for a temporary fix?? Seems like it would be the same thing as I have now (pump always on when car is going) but would mean I don't have to unhook the battery every time (and I could use the OEM pump electrical connection/wiring). Thanks in advance for more advice and tips (IMG:style_emoticons/default/beerchug.gif) |
|
|
|
Posts in this topic
itsmagic 1972 1.7 - Fuel pump not starting when key is turned Aug 8 2014, 10:46 AM
silverbullet75 It's been a while since I've seen this, bu... Aug 8 2014, 11:01 AM
itsmagic Where/what is 'the flapper' ? Thanks. Aug 8 2014, 11:05 AM Cap'n Krusty Your car doesn't have one. 914 with L-jet onl... Aug 8 2014, 11:09 AM sfrenck There is a nice flowchart for troubleshooting fuel... Aug 8 2014, 11:43 AM Tom To give a little more help, here is a more detaile... Aug 8 2014, 11:58 AM pt_700 my d-jet was one of those rare computer failures.
... Aug 8 2014, 12:05 PM silverbullet75 Sorry for the wrong/misleading info! Aug 8 2014, 12:10 PM rhodyguy so it dies when you stop pressing on the relay? sw... Aug 9 2014, 11:30 AM itsmagic Follow up: Thanks for everyones advice. I carefull... Aug 24 2014, 11:43 AM The Cabinetmaker Great job Wayne. And thanks for checking back and ... Aug 24 2014, 12:55 PM jcd914
The "exposed relay test" does not mean ... Sep 16 2014, 10:37 PM Chris Pincetich :bump:
:confused:
:headbang: Sep 16 2014, 01:26 PM Cap'n Krusty Remember what I said earlier. The main relay powe... Sep 16 2014, 11:01 PM Chris Pincetich thanks for helping! :beer2:
I know my curren... Sep 17 2014, 10:14 AM Chris Pincetich OK, did some testing and ready to do more once I g... Sep 20 2014, 07:46 PM Tom You can narrow down the search some by doing the f... Sep 21 2014, 01:39 AM Chris Pincetich There was no ground signal at the #3 connection of... Sep 22 2014, 11:24 AM Tom Chris,
Yes, If the wires and connections are go... Sep 22 2014, 12:38 PM Chris Pincetich Thanks for confirming, Tom. :beer2:
My 914 needs... Sep 22 2014, 01:38 PM Chris Pincetich Installed an ECU brain - mine was an early one wit... Oct 5 2014, 10:49 PM |
6 User(s) are reading this topic (6 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 17th January 2025 - 04:49 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.