280z cranks but won’t start

[silentbug]

The fuel injector armor clogged and I got the pump installed to the car instead of running it out of the first rail


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[silentbug]

And I’m confused about something
When you turn the key to the on position shouldn’t the fuel pump prime


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[silentbug]

And I don’t know if this is normal but when I unplug the oil pressure sender the fuel pump starts


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[silentbug]

Fuel injectors aren’t clogged*


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[heyitsrama]

http://www.xenonzcar.com/s30/fsm.html

Page 17 in the `EF Engine Fuel` section of the factory service manual talks about how the oil-pressure sender interacts in the fuel pump system. Might be a problem with the  oil-pressure sender... I assume there is oil in the system?

[silentbug]

Yes there is but I’ll make sure to double check


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[heyitsrama]

So whats the current status of the car? what have you done? what is the current issue? The more specific the better 🙂

Edited February 1, 2021 by heyitsrama

[silentbug]

I got a new fuel pump ,unclogged the injector, checked the AFM, replaced the broken watery temp sensor and now I’m checking the wiring harness and am going to clean all the connections
The car still doesn’t run but I’m having fun messing with it


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[SteveJ]

6 hours ago, silentbug said:

And I’m confused about something
When you turn the key to the on position shouldn’t the fuel pump prime


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No, the pump primes in the START position. 

 

6 hours ago, silentbug said:

And I don’t know if this is normal but when I unplug the oil pressure sender the fuel pump starts


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Incomplete information. That's like saying "My feet hurt when I stand up" without you mentioning that you're barefoot and surrounded by Legos.

[silentbug]

Ok well couple questions just to clarify the is the start position the one that cranks or the on before the car cranks and what other details do you need about the oil pressure sender


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[Zed Head]

10 hours ago, silentbug said:

And I don’t know if this is normal but when I unplug the oil pressure sender the fuel pump starts

This is normal for 1978.  It's a flaw in the design, but useful for testing the fuel pump circuit.  It should only happen when the key is On though.

Turn key On, remove sender plug, pump runs.  Only 1978 does this.

Edited February 1, 2021 by Zed Head

[silentbug]

Ok thank you


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