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Join Date: Mar 2008
Location: Fairhaven Ma.
Posts: 440
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Fuel pumps
Is there a way to check the alarm switch I can't get the pumps to run without jumping. I have spark
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03-28-2025, 10:34 AM
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There are other reasons.
Try running a ground wire from the wire on the o/boost sw, ie provide another ground for it. Have you pulled the plug behind the airplate? Then there is the relay in the rear compartment. 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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03-28-2025, 12:44 PM
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Location: Fairhaven Ma.
Posts: 440
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Alan I have jumped the yellow relay and can get the pumps to run. I have three yellow relays i know that two are good. Tryed the white over boost and still no good also Tryed the airplane nothing only if I jump the yellow
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03-28-2025, 01:21 PM
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Join Date: Jul 2008
Location: Central Washington State
Posts: 4,406
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Since you've tried the obvious culprits...grounding the overboost switch lead, pulling the plug from the airplate, and have confirmed that when jumping the yellow relay the pumps run (and you know for certain that you have good relays at hand that haven't solved the issue), then all I can think of would be the overspend relay under the drivers seat...but if it or it's connections were bad I'm not sure that even jumping the yellow relay would start the pumps.
As for the alarm thing, I have no idea.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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03-28-2025, 02:20 PM
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Location: Fairhaven Ma.
Posts: 440
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As far as I know the alarm kills the pumps that's why I was thinking it could be the problem as I don't have the key mark I was on here when you had tha fire glad to see that it all worked out.
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03-28-2025, 04:46 PM
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Join Date: Jul 2008
Location: Central Washington State
Posts: 4,406
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Quote:
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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03-28-2025, 05:44 PM
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Quote:
I know nothing about the alarm system. But it sounds like the rear relay is not energising. That relay feeds the energising circuits for the front relays. So one thing you could try is to pull the airplate sw, pull the rear relay and jump across terminals 30/87a. Key on. That should energise the front pumps. If they run, that tells us the problem is in the energising circuit for the rear relay (or the relay itself). 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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03-28-2025, 06:51 PM
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