NO POWER TO FUEL PUMP

  • Tiny
  • hmac300
  • Expert
  • 42,100 posts

There is a DARK GREE/Black wire to power the fuel pump, check to see if power goes through it to the pump and check the ground by the DISTRIBUTOR. Do not pull the power distribution center.

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Tuesday, August 14th, 2012 AT 11:58 PM
  • Tiny
  • aaronmcd
  • Member

Ok, so, you mean the 3 pin harness where the fuel pump plugs into?
There was no voltage unless I jumped the fuel pump relay
I'll check the ground tonight

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Wednesday, August 15th, 2012 AT 12:40 AM
  • Tiny
  • hmac300
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Ok if you have to jump the relay tehre is problem there, either the pcm isn't telling the relay to turn on or the auto shutdown relay isn't sending a signal

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Wednesday, August 15th, 2012 AT 12:42 AM
  • Tiny
  • aaronmcd
  • Member

How would I proceed then?

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Wednesday, August 15th, 2012 AT 1:01 AM
  • Tiny
  • hmac300
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Well recheck your fuses and see if the fuel pump relay is getting turned on. It's one of the previous answers I gave you. Also check fuse 21 in power dist box, the 96 is wired a little different and this may be closer to that. But it still leads to pcm or auto shutdown relay that turn on the fuel pump relay.

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Wednesday, August 15th, 2012 AT 2:19 PM
  • Tiny
  • saturntech9
  • Expert
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Aaronmcd what model jeep is this?Iam trying to find a wire diagram to see whats going on here.

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Wednesday, August 15th, 2012 AT 3:42 PM
  • Tiny
  • aaronmcd
  • Member

As I said in the first post, it's a 1995 jeep wrangler (YJ) SE (the 4.0L model)

I am going to recheck everything today

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Wednesday, August 15th, 2012 AT 4:13 PM
  • Tiny
  • KHLow2008
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  • 41,938 posts

When it fails to start, does the MIL illuminates when ignition switch is turned on?

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Tuesday, August 21st, 2012 AT 11:26 AM
  • Tiny
  • yjfanatic
  • Member

I have this exact same problem. Did you ever come up with a solution? '92 YJ 4.0 no power to the pump with switch on, 7 volts on middle prong of the pigtail at the tank, but can run 12V directly to the pump and will run.

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Saturday, October 13th, 2012 AT 3:14 PM
  • Tiny
  • KHLow2008
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Igniton switch on would only provide power to the fuel pump for a brief period, 2-3 seconds, for priming the system.

The 7 volts is for the sending unit.

Remove the fuel pump relay. Ensure you have battery voltage at terminal # 1. Use a fuse wire to bridge terminals # 1 and # 4 and if fuel pump does not work, you have an open circuit between the relay and fuel pump. Fuelpump circuit works on a rather high current flow and opens in circuits are often due to overheated terminals at connectors.

Btw aaronmcd had tried swapping relays, did you do that? Symptoms and even faults can be similar but the cause or source could be different.

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Saturday, October 13th, 2012 AT 8:21 PM

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