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> Fuel pump not running
Rand
post May 19 2019, 05:29 PM
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75, 2.0, djet. Won't fire. Spark is good. A little starting fluid in the intake and it fires. Clearly a fuel problem. I'm not hearing the fuel pump. Shouldn't I hear it for a few seconds when first turning ignition on? I checked the fuse (#25 on the relay board) and it's good. I'll put a multimeter on the pump terminals to check for power next, but thought I'd throw this out there to the collective for any other input until I can get back to it. Grounds are also on the list. Or put power directly to the pump and see if it runs.
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dralf
post May 24 2019, 11:33 AM
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Hello. it is me again. Before purchasing a new relay board I was advised to check my relays via the head light circuit. I did that and was elated that one of the relays was bad. I replaced it with a good one but sadly the fuel pump with still not energize. I found a old post by Minerva's 914 that seems to have had similar mysterious running issues and in his investigation found the relay board was bad by checking the continuity of the ground circuit pin #10 to the pump relay socket #86. Mine was OK. I then tried to put a ground wire jumper on pin III. My understanding is that this will bypass the ECU and will eliminate it as the problem. The fuel pump will still not run. I have heard the injectors click when the key is turned on so I am under the assumption that the ignition switch is OK.

I am thus sitting on the fence regarding spending the money for a new board. I will run a few more checks before taking that leap. I may eventually have to seek a professional to work on this. Although we have a Porsche Dealer in town I would prefer to have someone with real experience with the 1975 D Jet system work on it. I was actually told by the dealer that none of their mechanics were as old as my car.

So if anyone has a name of a shop or person in the Dayton Ohio area that could help me if I sink lower into this problem I would greatly appreciate it. Thanks..
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Posts in this topic
Rand   Fuel pump not running   May 19 2019, 05:29 PM
Spoke   To test the fuel pump drive w/o the FI ECU, remove...   May 19 2019, 06:47 PM
dralf   I may be having similar issues.... will try jumpin...   May 21 2019, 02:11 PM
lierofox   I may be having similar issues.... will try jumpi...   May 21 2019, 04:43 PM
dr914@autoatlanta.com   usually a loose fuel pump fuse or a relay not maki...   May 21 2019, 02:56 PM
Rand   Hey Al, it looks like we are in this together. Spo...   May 21 2019, 07:08 PM
Specracer   My recent experience, Had the car running, then st...   May 22 2019, 03:35 AM
rjames   Hey Al, it looks like we are in this together. Sp...   May 27 2019, 06:58 PM
Minerva's 914   I had the same problem as documented in an earlier...   May 22 2019, 07:30 AM
76-914   :agree: the flow chart will take you right to it.   May 22 2019, 07:46 AM
dralf   This morning I wired the fuel pump directly to a b...   May 22 2019, 11:50 AM
mtndawg   This morning I wired the fuel pump directly to a ...   May 22 2019, 12:38 PM
JFJ914   Check the pump circuit continuity through the rela...   May 22 2019, 12:01 PM
sixnotfour   @Conedoger the ground on my 76 was crusty   May 22 2019, 12:15 PM
dralf   Rainy here in Ohio and a good day to work on the c...   May 23 2019, 11:23 AM
dralf   Hello. it is me again. Before purchasing a new re...   May 24 2019, 11:33 AM
Minerva's 914   You said in the next to last post that the flow ch...   May 24 2019, 01:59 PM
porschetub   I had a dead spot in my relay board,it didn't ...   May 24 2019, 02:44 PM
dralf   First I would like to thank all the military peopl...   May 27 2019, 03:37 PM


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