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Re: 1985 nissan 300zx---not starting
To check fuel pressure psi you use a "Fuel Pressure Tester". Auto Zone and Advance Auto Parts offer a "Free Tool" loaner service. A few other chain type stores offer the same service. They allow to use their tools for free. The way it works, is that you go into the store, buy whatever tool you need to do the job, use the tool, then bring it back for a refund. In the end use of the tool ends up costing you nothing.
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Remove rotor button and points are underneath. Usually capacitor is what fails and prevents starting. It is also located with the points. Replace both (cheap!) and adjust points and you may have a fix. If not, check are you getting fuel delivery? Do you have spark at the plugs?
suspect 1) bad spark plug(s) - change whole set if needed, (2) failing ignition coil (3) failing distributor component(s), or (4) worn out distributor cap and/or rotor - if these need to be changed, change both the cap and rotor as a set. COST: if yo do any of these repairs yourself, your parts costs would be fairly low, but getting a garage to rebuild your distributor could be costly
check the fuse and relay switch for the instrument cluster,which includes the fuel gauge. if they are okay,and no check engine light comes on,then the float in the gas tank,which gives you your reading,is stuck and needs replaced.
Fuel delivery must be confirmed with a fuel pressure gauge on this vehicle. Disconnecting the fuel line and cranking the engine to see fuel shooting out does not confirm pressure, it only confirms fuel delivery. Remember you need both fuel delivery and pressure. On this vehicle if the psi is off by just one number that's enough to keep it from starting. Also replacing the coil and rotor (as you stated) does not confirm that spark is reaching the plugs. Confirm that both spark and adequate fuel pressure are reaching ALL the spark plugs.