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Discussion Starter #1
Hi. I recently changed my fuel pressure regulator and fuel pump and sending unit and the car isn’t starting or getting fuel pressure and I replaced the fuel lines, and I am hearing a air Noise at the gas tank area
 

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1983 280ZX Turbo
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Sounds like you're not pulling gas from the tank. Is there a vacuum in the tank, causing the noise you hear?

Did you use the correct fuel pump? Just any pump won't work.
 

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Are you sure you have the wire polarity correct on the fuel pump? If I recall, you have to solder some wires for that job. If you have the wires backwards the pump will make a sound but not work.
 

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late 1970 Series 1 240Z
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Suggestion. Remove the gas filler cap, turn on fuel pump, if your hearing air being pushed into the tank your hoses are backwards. Switch them then rechect the above. All working?
 

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late 1970 Series 1 240Z
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Okay, it sounds like your OP comments have hanged, correct? How do you know you has fuel at the carbs? Did you have a problem before you changed all of the fuel items you did? What were those problems? Is fuel discharging out the accel. pumps? Are the chocks closing? have you looked at those items to make sure they are doing what they are suppose to do?
let me know, Ed
 

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Okay, it sounds like your OP comments have hanged, correct? How do you know you has fuel at the carbs? Did you have a problem before you changed all of the fuel items you did? What were those problems? Is fuel discharging out the accel. pumps? Are the chocks closing? have you looked at those items to make sure they are doing what they are suppose to do?
let me know, Ed
Hey Ed, since he posted in the 84-89 section, it's a fuel injected 300ZX. That might make this a little simpler, but not much. :)
 

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late 1970 Series 1 240Z
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Ocsillation,
Thanks, I missed that. Injectors are hard to check unless one removes them or has a noid tester. But spray patterns testing needs removal of injectors as you know.
 

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Discussion Starter #13
Ok so I found out my fuel pressure regulator or control solenoid isn’t turning on it gets volts but won’t turn on I’m guessing that it goes to the ecu. Would any of y’all know where it goes to or a check list for the fuel system
 

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late 1970 Series 1 240Z
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Matthew,
Do you have a manual? I'm not a Z knowitall. I would need to check the shop manual to answer your question better. I'm sure others have more knowledge on Z's then I do. When I get some time I will see if I have a manual on 300Zx's. What year is yours?
Ed
 

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It would good to know what year and what exact model of car we are talking about. Currently I am not even sure we are talking about a z31.

Next get the Factory Service Manual for your car. You can download the FSM from xecnonzcar.com.

Was your car running before the changes described in the original post?

What is the status of your fuel system now? What is the fuel pressure after you turn your car on (don't try to start it). What is the voltage at your fuel injectors with the car on (don't start it). Do your injectors fire when you are trying to start the car? The injectors make a clicking noise when they fire that can be heard by pressing a large screwdriver against the injector body and holding it to your ear.
 
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