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View Full Version : No power to the fuel pump relay...HELP!...wiring expert needed!

91white_ka
08-21-2009, 11:13 AM
Ok so quickly to get everyone on the same page. I have a 90 hatch shell, with a dohc swap. It's a 5-speed, base model, manual everything.

Let me start of by saying I HAVE NO SOHC WIRING IN THE CAR AT ALL!. Nothing is cut at all,Every piece of wiring is from a 92. Motor is from a 96. I have an S14 upper intake mani. All emissions removed. Windshield squirters, A/c, and emissions wiring is still present in the harness but not plugged in.
Ok so I just rebuilt the motor, and wired the car up. When I turn the key on I get power to the fuel pump fuse, but not to the relay (tested with a multimeter) If I jump a wire from the batter to the "out" prong of the relap the pump comes on and the car runs fine. Any ideas? Thanks.
HAWAII
08-21-2009, 11:46 AM
change the relay.
91white_ka
08-21-2009, 12:33 PM
NO POWER TO THE RELAY....so I should place a new relay in this dead slot just to see if that draws power? That's what your saying?
midnightouge
08-21-2009, 12:47 PM
I had the same problem, it was a loose ground that bolts up to the engine, on top of the header.
91white_ka
08-21-2009, 01:15 PM
Are you talking about the one that comes off the upper engine harness and has another little secondary ground that goes to the fire wall?
midnightouge
08-21-2009, 03:58 PM
Yes sir, that's it.
91white_ka
08-21-2009, 07:58 PM
Wow when I did my wire tuck that ground wouldnt quite reach the mounting spot on the head. So i just mounted it on the firewall. I wonder if that was my problem....I have some extra 4ga wire laying around I'm going to add a grounding kit tomorrow.
91white_ka
08-23-2009, 09:39 AM
Ok so I pulled my dash, interior, and front clip off to check all my wiring, I found a ground that I had completely missed back by the driver rear strut tower. Still no power to that relay. Pump won't even prime, and cluster is non-working completely. Does anyone know what those relays under the dash mounted to the fuse boxes are?

Also my EGI relay (located just to the left of the fuel pump relay is clicking after I turn the key off.
91white_ka
08-23-2009, 08:51 PM
cut an extra harness apart today and found the fuel problem.

PS the two prongs closest to the front of the car feed directly from the fuel pump fuse. The purple and black wire goes to the ECU, and the other wire (lower left if your looking at the relay from the side of the car runs all the way to the fuel pump. Hope this helps someone else.