got stranded .... |
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got stranded .... |
dax1969 |
Apr 17 2023, 09:13 AM
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#1
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Member Group: Members Posts: 372 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 |
dax1969 |
Apr 18 2023, 12:20 PM
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#2
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Member Group: Members Posts: 372 Joined: 10-March 14 From: belgium Member No.: 17,103 Region Association: None |
UPDATE: up and running …
Cleaned sockets with some sandpaper wrapped around a toothpick… spread the pins slightly and bam… The familiar buzz of the fuelpump is back… Anyway, once the new relays are in fm 914rubber I will put those in and carry the wehrles as spare… @spoke … thks yr drawing and explanation. That one is much simpler to understand for a non electrician Happy it was not more than that (although I feel stupid as I could have fixed it myself on the road… anyway first time I used roadassistance and their service has been tested now (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif) Thank you all Dax |
DRPHIL914 |
Apr 18 2023, 12:30 PM
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#3
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Dr. Phil Group: Members Posts: 5,808 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
UPDATE: up and running … Cleaned sockets with some sandpaper wrapped around a toothpick… spread the pins slightly and bam… The familiar buzz of the fuelpump is back… Anyway, once the new relays are in fm 914rubber I will put those in and carry the wehrles as spare… @spoke … thks yr drawing and explanation. That one is much simpler to understand for a non electrician Happy it was not more than that (although I feel stupid as I could have fixed it myself on the road… anyway first time I used roadassistance and their service has been tested now (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif) Thank you all Dax (IMG:style_emoticons/default/beer.gif) awesome! sometimes its a simple thing we have overlooked, i had that happen, about 5 years ago upon reassembly after paint and body work, the ground wire to the fuel pump somehow disconnected, and no start issue, spent 3 hours going thru the whole test and diagostic proceedure for the ignition system and relay board to find out if i hand just checked continuity for the pump circuits id have saved a lot of time, but its never a waste i was able to confirm the rest of the system was working just fine. |
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