Fuel pump not running |
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Fuel pump not running |
Rand |
May 19 2019, 05:29 PM
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#1
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
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 |
May 24 2019, 11:33 AM
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#2
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Member Group: Members Posts: 230 Joined: 24-January 04 From: Dayton, Oh Member No.: 1,597 |
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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