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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 10-12-2019, 02:35 PM   #1
Socal240sxSr20det
 
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62/63 Harness missing Pin 105

I'm currently trying to get my blacktop sr20det to start and i'm having issues with my fuel pump not priming. I noticed that pin 105 is missing for "Fuel pressure control module". Its a wiring specialties harness, used. No unpinned wires are coming out of the loom so, i'm confused. Is this the cause of my issue, or its not needed.
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Old 10-12-2019, 02:43 PM   #2
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Pin 105 is not needed on an sr20 swap


Lets get to basics...

Do you have spark?

Do you have fuel pressure?

Do you have injector pulse?
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Old 10-12-2019, 02:49 PM   #3
Socal240sxSr20det
 
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Yes, i'm getting spark, and injectors are firing. When i turn the CAS i can hear/feel the fuel pump relay clicking but the pump will not prime. I've checked and i'm getting power through the front harness, and to pin 104. But no power to the fuel pump harness, but it works fine on the bench test. I've tried 2 ecu's and don't think thats the issue. switched relay's and fuel pump fuse.
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Old 10-12-2019, 06:59 PM   #4
S14rebuild
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If the fuel pump relay is clicking then 3 things

1 bad relay

2 bad wiring from relay to fuel pump

3 bad fuel pump


Uve eliminated 1 and 3

Sonid be tracing wires from your fuel pump relay, to ur fuel pump.

Also make sure the fuel pump is grounded properly
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