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Registered
Join Date: Nov 2019
Location: Central Connecticut
Posts: 558
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over boost / fuel pumps
Still sorting out my newly rebuilt 76 3.0l row turbo motor pretty much stock slight upgrades long neck period inter cooler cams and a raptor k27 from evergreen turbo and the typical case mods .....just looking for a reliable driver. The motor is in an 1980sc widebody car . That was modified to accept the turbo motor back in the 90s ... When i was going through the car i noticed that it only had 1 rear fuel pump and that wire looked to have been slightly over heated over the years . There was also provisions for a front fuel pump but the pump was missing . so i installed twin bosch o44 . The rear fuel pump is feed from the rear fuse box and the front is feed from the front fuse box. They currently both go on and off through the ignition. the pumps do not shut down when i test the over boost, so where to start .im not opposed to starting from scratch with all new new wires and external relays. first time time turbo long time non turbo 911 and 356 guy
TIA Regards Ned Last edited by gorskined; 11-04-2021 at 04:07 AM.. |
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11-03-2021, 11:07 AM
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I do not have wiring diagram for the 76, but on the later cars pretty sure both pumps are fused only up front, possibly check if only your front pump is turning off with over boost condition.
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87 930, |
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11-03-2021, 07:15 PM
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Yes fuses both normally up front, as are relays. One per pump (fuse/relay).
The o/boost sw is part of a daisy chain that completes an earth circuit that energises the pump relays. Your car has been wired outside of these parameters. Somewhere your pumps (relays) are getting independant earths from the daisy chain they should be connected to. Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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11-05-2021, 07:48 PM
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Registered
Join Date: Mar 2011
Location: Nova Scotia, Canada
Posts: 323
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On my 1982 each fuel pump has a separate relay but both relays are powered by one fuse in the front panel. There are a few good Pelican threads on how having this one fuse overtaxes the wiring.
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11-06-2021, 05:25 PM
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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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Hey Ned-
Where in Central CT you? I'm in Tolland and could come take a look at it with you sometime. great to have another local owner on here... |
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11-08-2021, 06:39 AM
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Registered
Join Date: Nov 2012
Location: Bydgoszcz, Poland
Posts: 222
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I can send you pics of 76 930 wiring if you want to.
Let me know. Krzysztof |
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11-08-2021, 02:03 PM
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Registered
Join Date: Nov 2019
Location: Central Connecticut
Posts: 558
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Quote:
Regards Ned |
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11-09-2021, 04:35 AM
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1987 930
2013 KTM RC8R
1999 BMW R1100s
1987 BMW 535i
