 1974 wiring and fuel problems, need answer to the wiwing of fuel pump from relay board |
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| Matthewk |
 Sep 25 2025, 06:46 PM
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#1
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Newbie  Group: Members Posts: 3 Joined: 8-October 24 From: Washington state Member No.: 28,398 Region Association: Pacific Northwest  |
Hello, I've been working on a 1974 914 for the past year. Ive rebuilt the motor since the last owner overheated it somehow (no compression). Ive put the motor back in and I cannot seem to remember where any of the small female ground connectors go from the wiring harness. Like the many different small ones in the transmission harness that goes into the engine bay. And the two near the distributor. I remember there being a ground connection under the intake but I dont know which ones go there. Ive been trying to read wiring diagram but I cant understand it what so ever because nothing is labeled. So I'm just guessing reading it.
My other question is, what do I do about the fuel pump not working. If you put power externally it works, but from the relay board it just has no power past it. The power supply relay clicks, but fuel pump does not. There was power to the fuel pump relay pins a couple days ago now there isn't. Maybe I'm just tweaking out. Last owner has a whole bunch of fuel pump related things highlighted in the book he gave me. My brother read that the relay board could go bad but I doubt it. In another post, I read that you need to switch the 25 amp fuse for an 18. It solved someone else problem of blowing relays. Ive swapped relays around and they work in other spots. So it isn't bad relays. Hopefully someone understand what I'm asking and has the solutions for it. thx |
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| JeffBowlsby |
Sep 26 2025, 06:02 PM
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,056 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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This diagram should answer all you questions: https://bowlsby.net/914/WiringHarnesses/doc...74-75_L-Jet.pdf
If not let me know. Adding photos is easy, if you know rules. http://www.914world.com/bbs2/index.php?showtopic=13637 |
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| Matthewk |
Sep 26 2025, 06:33 PM
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#3
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Newbie Group: Members Posts: 3 Joined: 8-October 24 From: Washington state Member No.: 28,398 Region Association: Pacific Northwest |
QUOTE(JeffBowlsby @ Sep 26 2025, 05:02 PM)  This diagram should answer all you questions: https://bowlsby.net/914/WiringHarnesses/doc...74-75_L-Jet.pdf If not let me know. Adding photos is easy, if you know rules. http://www.914world.com/bbs2/index.php?showtopic=13637 oh thx. can you send me a diagram for main harness too? Thank you! |
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Posts in this topic
Matthewk 1974 wiring and fuel problems Sep 25 2025, 06:46 PM
JeffBowlsby Help us help you!
Start by telling us what en... Sep 25 2025, 07:51 PM Matthewk So, its a fully stock 1974 1.8L
https://ik.image... Sep 26 2025, 05:20 PM
JeffBowlsby All are here:
https://bowlsby.net/914/WiringHarne... Sep 26 2025, 06:38 PM wonkipop
Hello, I've been working on a 1974 914 for th... Sep 26 2025, 06:55 PM fiacra
Hello, I've been working on a 1974 914 for th... Sep 26 2025, 07:39 PM wonkipop and if you are looking for a really good wiring di... Sep 26 2025, 09:03 PM
wonkipop forgot to mention.
you can test the fuel pump is r... Sep 27 2025, 01:28 PM |
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