 Fuel pump for carbs on a '75, help |
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| mtndawg |
 May 15 2019, 10:16 PM
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#1
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Member  Group: Members Posts: 414 Joined: 26-January 09 From: Granite Bay, Ca Member No.: 9,985 Region Association: None 
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I have been following the directions in other posts to wire my car for carbs with a low pressure pump under the tank. In front I have a black/red wire and brown for ground which is expected. My number 13 pin on the 14 pin connector is green rather than black with red. I can't find a diagram of a '75 relay board and it's not in my manual. The previous owner had blue a jumper wire connected as shown in the photo. Is this arrangement right for this year when running carbs?
Attached image(s)  
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| mtndawg |
May 16 2019, 07:42 AM
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#2
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Member Group: Members Posts: 414 Joined: 26-January 09 From: Granite Bay, Ca Member No.: 9,985 Region Association: None
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Yes the PO had 3 and 4 connected. I’m not getting power when I ground 3 and Pin 13 is not showing 12v when the key is on. Seems like something is different on the ‘75 car?
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| Spoke |
May 16 2019, 08:06 AM
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#3
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Jerry Group: Members Posts: 7,126 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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QUOTE(mtndawg @ May 16 2019, 09:42 AM)  Yes the PO had 3 and 4 connected. I’m not getting power when I ground 3 and Pin 13 is not showing 12v when the key is on. Seems like something is different on the ‘75 car? The relay board is the same on all years. Power to pin 1 of the FI connector comes from the power supply relay. You should have 12V on pin 1 with the ignition switch on. Careful as the 12V on pin 1 is not fused. The power to the fuel pump relay coil is also the power supply relay and pin 1. Do you have power at the 25A fuse? This is for the fuel pump relay. In your picture with the 14 pin connector apart, it is assumed you have the battery NEGATIVE terminal disconnected. There are no fuses between pin 12 and pin 14 wires to the battery. Here's a diagram of the relay board from Pelican showing wire colors. Attached thumbnail(s) 
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Posts in this topic
mtndawg Fuel pump for carbs on a '75 May 15 2019, 10:16 PM
Chi-town The blue jumper wire activates the fuel pump witho... May 16 2019, 05:21 AM Spoke It looks like pin 3 is connected to pin 4.
Pin 3 ... May 16 2019, 07:24 AM mtndawg I found a Bowlsby photo that shows the '75 wit... May 16 2019, 08:53 AM mtndawg I have power on both sides of the fuse
Tested the... May 17 2019, 08:09 AM
Spoke
I have power on both sides of the fuse
Tested th... May 17 2019, 08:18 PM wndsnd Well it looks like fuel pump week. I wish I had s... May 17 2019, 09:01 PM mtndawg Had the relay board out testing everything I could... May 18 2019, 02:50 PM Spoke
Had the relay board out testing everything I coul... May 18 2019, 02:57 PM |
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