Fuel pump just quit Options

[surfdogskier]

So I had everything working well on my carb conversion with the exception of the fuel pump which constantly ran unless I pulled the ground wire per SirAndys carb conversion write up.

Now my pump will not work at all. I direct wired it to the battery to see if the pump was good and it worked. I connected a 12 volt wire to my relay board at the black/red wire #13 connection and it worked. So no issue with the wire. However something on the relay board or relay prevents it from working when the key is turned on.

I was going to wire it to the 2 other points on the relay board to get 12 volts (T4b and the #12 pin on the T12 connector). However, with the key turned on, I am not getting 12 volts to either of these. the T4b, I am getting 2 volts and the pin 12 on the T12 I am getting 4 volts.

My only other option to get 12 volt power is to connect to my coil but I have read this is not a good idea.

Looking for some guidance.

[Rand]

I understand the hack to get by. I do that too. But it is TEMPORARY. Don't just skate by on this "solution" please. If you do every fix like this, your car will be a nasty mess devaluating by the second.

[lierofox]

I understand the hack to get by. I do that too. But it is TEMPORARY. Don't just skate by on this "solution" please. If you do every fix like this, your car will be a nasty mess devaluating by the second.

I'm not sure if it's too late now to swap it back to stock or not, but, I'd want to look through the relay board, personally. See where the power is getting lost. Is it getting lost at the Power Supply relay coil? Is it getting lost a the output of the power supply relay? Is it getting lost at the fuel pump relay coil? Is it getting lost at the outlet of the fuel pump relay?

You said in the very first post that there was no power on the switched 12v terminal on the T4B connector, well that 12v comes from the Power Supply relay, so either:

A: +12v key voltage isn't reaching the Power Supply relay (terminal 85)
B: The Power Supply Relay has no ground at the coil (terminal 86)
C: The Power Supply Relay has no power going to its input terminal (terminal 30)
D: The Power Supply Relay has no power coming out of its output terminal (Terminal 87)
E: The Power Supply Relay is just inoperative.

To test the board I'd use a multimeter and test for continuity:
Between Pin 8 on the T14 connector and Terminal 85 on the Power Supply Relay.
Between Pin 10 on the T14 connector and Terminal 86 on the Power Supply Relay.
Between Pin 12 on the T14 connector and Terminal 30 on the Power Supply Relay.
Between Terminal 87 on the Power Supply Relay and Terminal 85 on the Fuel Pump Relay.
Between Terminal 87 on the Power Supply Relay and Terminal 1 on the T4B connector (the top right one labeled Last Resort Unfused Private Switched +12v)

All of those points should have continuity even with the relay board fully unplugged. If all of those test good, I'd test the Power Supply Relay, you could even pull a relay from the headlight motors and swap it in place to test it that way.