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dax1969 |
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#1
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Member ![]() ![]() Group: Members Posts: 367 Joined: 10-March 14 From: belgium Member No.: 17,103 Region Association: None ![]() ![]() |
Hi guys,
Got stranded yesterday with my 1974 2.0 fi... no buzz fm the fuel pump. Saturday the car started and ran great, only thing I did to the car that day is that I took my steering wheel off as it was a few teeth off center. Used a impact gun to remove and install the big nut (no idea if this has something to do with my issue). Perhaps I had to be more gentle ... Before I left on sunday morning I turned the key and heard no buzz fm the fuel pump... tried again and there was the buzz and the car started right up. Went to fill up the car and no issues with starting. After a 50 km drive I parked the car and when I came back again no start/no buzz fm the fuel pump. Started switching the relays, even with the ones fm the headlights... no buzz/no start. Switched fuses on the relay board (that's why you see the white in the position of the blue and vice versa)... still nothing. Called roadassistance and luckily an older gentlemen showed up. He took his voltmeter and said he could get the car started if he jumpered the relays - see picture. The car indeed started right up and I headed the 50 km back home with no issue. Disconnected the jumper ofcourse as the pump otherwise kept working. So where to start fm here... I have the file "porsche 914 fuel pump troubleshooting" but did not go through yet. I just keep wondering what could cause my issue. The questions I have are the following : 1. Can the removal/reinstalling of the steeringwheel cause this issue (perhaps the connection of the switch came loose ? Pinched a wire so no ground ? 2. Ignition switch was replaced about a year ago (Porsche one, not chinese crap). If an ignition switch fails, does the car crank or nothing at all ? Trying to figure out if I have a switch failure. 3. My fuel pump has a slight "humm" for a while (assumed it was resonance with the bottom plate (fuel pump is located near the rack) but can a fuel pump go bad "half" ? I mean can she fail on giving the familiar buzz at start up but still run when relays are jumpered ? 4. Relay board itself was replaced a year ago with a rebuild one fm Bruce Stone Some advice I received on facebook 1. splitting/widening the relay pins (did this in the past but perhaps have to do it again) - fyi ordered new relays anyway 2. bad CHT sensor ? But once the car starts with the jumpered relays, the car runs fine. Overruled by other members in the meantime Any suggestions are welcome... thks Krgds Dax ![]() |
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87m491 |
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#2
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Member ![]() ![]() Group: Members Posts: 276 Joined: 29-July 12 From: Portland, the original! Member No.: 14,731 Region Association: North East States ![]() ![]() |
I think your answers are right in your post. To play on words, I think
your steering wheel swap is a red herring or "Post Hoc" fallacy, i.e. "after the the fact, there for because of the fact". I'd bet highly unrelated UNLESS you messed with the ignition switch as well in the process. Ignition on, no fuel pump buzz means either the switch signal is not getting to the relay, or the relay is bad (or possibly the lead from the relay to the pump is suspect). The fact that the repair fellow jumpered the relays (amazing he knew which ones. I'd have to consult a manual) and you were on your way points to bad relays or bag ignition switch trigger. (but might have also been coincident with a wonky ignition switch playing nice for a moment. You need to do what roadside repair did and grab a DVM and find the weak link. Hopefully easy like the switch or the relay and not a bad wire or relay board etc, but any should be pretty straight forward to pin down. Hi guys, Got stranded yesterday with my 1974 2.0 fi... no buzz fm the fuel pump. Before I left on sunday morning I turned the key and heard no buzz fm the fuel pump... tried again and there was the buzz Called roadassistance and luckily an older gentlemen showed up. He took his voltmeter and said he could get the car started if he jumpered the relays - see picture. So where to start fm here... I have the file "porsche 914 fuel pump troubleshooting" but did not go through yet. I just keep wondering what could cause my issue. The questions I have are the following : 1. Can the removal/reinstalling of the steeringwheel cause this issue (perhaps the connection of the switch came loose ? Pinched a wire so no ground ? Any suggestions are welcome... thks Krgds Dax ![]() |
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