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Weird no power to fuel pump 280z 76'


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#1 ericp501

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Posted 06 November 2016 - 10:03 AM

I've bypassed everything to the battery to be sure pump is working as it should. If I just turn the key I'm getting no power. If I put the key in the start position and push the flap on the AFM I hear the relay click but the pump doesn't run.. Thoughts?

#2 NewZed

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Posted 06 November 2016 - 11:14 AM

Not really clear what you're saying.  You said that you bypassed everything, so why would the AFM and relay matter?  No power to what?  Why would you push the flap with the key in the Start position?  The flap controls it in the On position.

 

Sounds like you've collected some information.  You're just not using it right.  Try putting everything back together the way it should be, disconnect the little yellow wire to the starter solenoid, then turn the key to Start.  That should send power to the pump.  If it doesn't spin, check for voltage at the terminals with the key turned to Start.

 

Or put everything back together, turn the key to On, and open the AFM flap.  The pump should get power.



#3 ericp501

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Posted 06 November 2016 - 11:28 AM

Sorry, nothing was working so I ran direct power to be sure it works, which it did so I disconnected the direct line to try to figure it out.

#4 NewZed

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Posted 06 November 2016 - 11:54 AM

You had a good clue with the relay clicking when you opened the flap.  Follow the power.  The AFM switch must be working, that's one.  The relay clicks, that's two.  If the contacts in the relay are closing, power should be supplied to the pump through the relay.  Get in to the wiring diagram and follow the wires back to the pump from the relay.  There's a connector right next to the passenger seat that carries the power back.

 

Since you know you have the AFM and AFM power in to the relay working, and you know the pump works, check the relay itself if the wires back look right.  There's a procedure in the EF chapter.  You'll need a meter.  Make sure that power is being supplied to the relay to run the pump.  There might be a fuse, can't remember.

 

You can also disconnect the wires by the passenger seat and supply power there if you're careful, or check continuity back through the pump motor.  Break the chain in to parts until you find the broken link.

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#5 NewZed

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Posted 06 November 2016 - 12:01 PM

Looks like there's no fuse on the power supply line to the fuel pump relay.  It comes directly from the fusible links.  Are there other things that don't have power also?  Check your fusible links.



#6 ericp501

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Posted 06 November 2016 - 04:07 PM

One of the fusible links looks to be shot. Going to work on getting that replaced and try again. Thanks




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