Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

> Fuel Pump - Need Help, trying to fire up my barn find for first time...no fuel
willimac
post Sep 14 2014, 07:48 PM
Post #1


Newbie
*

Group: Members
Posts: 14
Joined: 14-September 14
From: minnesota
Member No.: 17,901
Region Association: None



I'll try to keep the story short. I have a '74 1.8 L-jetronic 914 that I rescued from a barn in central Wisconsin almost 3 years ago. It had sat for over 20 years and become a palace for generations of barn mice, who built nests in every available cavity. Since then I've been sporadically cleaning it up, vacuuming mice and their nesting material, dropping the engine, dismantling and rebuilding it, cleaning up rust, shopping new parts (alternator, starter, stainless fuel lines, seals and gaskets) re-boring the cylinders, splicing chewed-through wiring, etc... finally got it put back together this week and am having trouble with the fuel delivery. The fuel pump does not turn on.

There is power to the double relay switch - terminal 86a checks out with the ignition switch on start, zeros out in "on" position , and AFM resistance checks out. The terminals at the fuel pump plug read zero volts unless the ignition is turned to "start" and the AFM is propped open - in which case it reads 7 - 8 volts.

Don't know what to do---is there a way to test the pump to see if I need to replace it? Why would only 8 volts be making it to the terminals for the pump? Is this possibly a problem with the double relay switch?

Any help would be greatly appreciated...I feel very close to bringing this one back from the dead.Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic
willimac   Fuel Pump - Need Help   Sep 14 2014, 07:48 PM
timothy_nd28   Sounds like a weak ground   Sep 14 2014, 09:11 PM
Chris Pincetich   More tips/advice in this thread http://www.914worl...   Sep 14 2014, 10:24 PM
willimac   Thanks for the speedy responses. So I cleaned up t...   Sep 15 2014, 12:24 PM
timothy_nd28   Ok, let's rule out a bad ground at the fuel pu...   Sep 15 2014, 12:48 PM
willimac   Same result - starts at 8 volts and slowly decreas...   Sep 15 2014, 01:08 PM
timothy_nd28   From the fuel pump's ground wire to the negati...   Sep 15 2014, 01:09 PM
willimac   Yes. because the plug wouldnt allow me to get in t...   Sep 15 2014, 01:18 PM
timothy_nd28   not quite what I had in mind but lets move on. Wh...   Sep 15 2014, 01:35 PM
willimac   not quite what I had in mind but lets move on. W...   Sep 15 2014, 04:55 PM
timothy_nd28   K, double check the voltage at 88d on the dual rel...   Sep 15 2014, 05:05 PM
willimac   K, double check the voltage at 88d on the dual re...   Sep 15 2014, 07:11 PM
timothy_nd28   yep, the bigger black wire with red stripe is the ...   Sep 15 2014, 07:56 PM
willimac   yep, the bigger black wire with red stripe is the...   Sep 15 2014, 09:27 PM
timothy_nd28   You're very welcome. :beer2: The voltage dr...   Sep 15 2014, 09:43 PM
willimac   You're very welcome. :beer2: The voltage d...   Sep 15 2014, 09:58 PM
timothy_nd28   Maybe both, could of been a domino effect. I'l...   Sep 15 2014, 10:03 PM
willimac   Maybe both, could of been a domino effect. I...   Sep 16 2014, 11:12 AM
Dave_Darling   Connect that jumper wire and measure voltage acros...   Sep 16 2014, 12:28 PM
willimac   Connect that jumper wire and measure voltage acro...   Sep 16 2014, 01:40 PM
Dave_Darling   Voltage at the pump is about 8 volts, decreasing t...   Sep 16 2014, 06:25 PM
Chris Pincetich   You could just wire the pump direct to the batter ...   Sep 16 2014, 01:46 PM
willimac   You could just wire the pump direct to the batter...   Sep 16 2014, 03:52 PM
timothy_nd28   Stranded 12 or 14 gauge would be fine, but I think...   Sep 16 2014, 04:32 PM
willimac   Stranded 12 or 14 gauge would be fine, but I thin...   Sep 16 2014, 05:39 PM
Bob L.   Start a WTB thread or search the for sale stuff in...   Sep 16 2014, 06:12 PM
willimac   UPDATE: after much effort and frustration (mor on...   Sep 17 2014, 10:17 AM
dknechtly   This is a good time to relocate it up under the fu...   Sep 17 2014, 01:16 PM
willimac   UPDATE: Original fuel pump is relocated to front, ...   Sep 20 2014, 06:51 PM


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 23rd May 2024 - 01:59 AM