Help-1983 S2 No Fuel Pump Power
Hi, I've been restoring a 1983 for almost a year now and am working on the interior. After a carpet install and a combo switch (turn signals/lights) replacement my fuel pump quit, I don't think I disconnected any wiring accidentally and I did check all visible connectors and from what I can tell the power supply doesn't run through the combo switch. I checked for power at the fuel pump connector under the storage box it had no power, Then I checked the fuse its good but the fuse is not getting power at the box. From what I can tell the S2 doesn't have a fuel pump relay like the S3 does. After looking at the wiring diagram I'm thinking ignition switch. Has anyone had this problem or have any advice? Thank You.
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Are you getting 12V to the pump connector when the engine is cranking over? Have you attempted to apply 12V direct to the pump connector to determine if it can be powered with direct power?
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Originally Posted by mazdaverx713b
(Post 12364452)
Are you getting 12V to the pump connector when the engine is cranking over? Have you attempted to apply 12V direct to the pump connector to determine if it can be powered with direct power?
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Use the schematic to trace the 12v source back till you get it. You might need to be cranking to get the 12v to the pump.
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Originally Posted by KansasCityREPU
(Post 12364532)
Use the schematic to trace the 12v source back till you get it. You might need to be cranking to get the 12v to the pump.
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You may find that you have a small break in one of the wires in the harness that feeds power to the fuel pump. It's a short routing honestly. You'll have to remove the driver's seat and pull the carpet up to expose the harness. Will lead you right to the pump under the storage bin frame from the fuse panel. Should be able to see if any wiring was chewed by a rodent or if something was flexing where it shouldn't and ruined through the harness and caused an open in the circuit.
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Glad to hear you got it sorted! As mazdaverx713b said, could be a small wiring issue that crept up over time (like chafing or wear) that will be difficult to track down. What matters is that for now your car runs!
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Originally Posted by mazdaverx713b
(Post 12364615)
You may find that you have a small break in one of the wires in the harness that feeds power to the fuel pump. It's a short routing honestly. You'll have to remove the driver's seat and pull the carpet up to expose the harness. Will lead you right to the pump under the storage bin frame from the fuse panel. Should be able to see if any wiring was chewed by a rodent or if something was flexing where it shouldn't and ruined through the harness and caused an open in the circuit.
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Strongly suggest looking for the true root cause, then fix it.
We've all had to deal with issues from prior owners that half-fixed things that make it difficult to know what's going on. One of the big benefits of the FSM and the knowledge on his board is that if it's in factory configuration, someone can tell you how to fix it from a thousand miles away.
Start plugging crap together, bypassing factory wiring, and you're on your own from that point forward. I learned this while troubleshooting my SE short that turned out to be the Bypass Air Control Valve harness shorting against the solenoid body, when I thought it was the Fuel Pump Relay - not even close in proximity. Put some additional effort to find the root cause and you'll be thanking yourself later, and will retain confidence in the vehicle. Every workaround kills confidence when stuff breaks or stops working... |
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