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Re: 200 sx not getting fuel to injectors
It could be a bad fuel pump or wiring to the fuel pump, but it could also be a clogged fuel filter. If the fuel is getting to the injectors but not into the engine, the injectors may be clogged and in need of replacement. There are repair manuals that can help you find and replace your fuel filter, which should be replaced at regular intervals (depending on your service schedule), and these manuals can be found at the library or auto parts store. The most common manuals I know of are Chilton and Haynes. Both are made for your exact vehicle and have the steps to fix any problem, down to a complete tear-down and re-build of your car (including injectors).
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unlikely but low fuel pressure in the manifold can as the injectors will not have enough fuel pressure to work properly. I would have a pressure test done on the fuel manifold to check regulator / pump supply and filter condition. Run fault codes to see if any faults are recorded
Stock ecu and injectors should be fine for normal use.
Is there a reason why you need bigger injectors?
Are you going turbocharging or supercharging it?
If so then you might consider AEM FIC or SMT-6 or Megasquirt.
And depending on you goals;
290cc sontata injectors for about 4psi ~200-240 hp
440cc Blue WRX injectors for about 8+ psi for ~200-300 hp
first relief fuel pressure before disconnecting fuel lines remove fuel pump fuse or relay start engine let it idle until stall out lack fuel fuel now fuel pressure is reliefed. you have to remove top upper air cleaner housing, you have to remove whole entire air cleaning system because the fuel lines with fuel injectors is under the air cleaner filament you have to remove entire fuel line with fuel injector in order to replace fuel injector.
check to see if your getting spark, if you are make sure your getting fuel. if no spark check coil primary resistance it should be from 1 to 3 ohms. if your not getting spark it can only be a primary ignition problem not a secondary one, example plugs,plug wires. if you are getting spark but no fuel. pull fuel pump relay and jumper wire together #30 and #87 teminals diagnally across from each other under the relay you just pulled out good luck!!!
It sounds like a fuel delivery problem, maybe the fuel pump. Since it starts after a few days it sounds like the pump works well enough to get the fuel to the engine, but once the pump needs to continue to deliver fuel on an ongoing basis, it dies out. I'm not positive, but it could be the problem. You might also have dirty fuel injectors, or a vaccum leak of some sort around the throttle body. It's easy to know if you are having vaccum problems becasue you will hear a hissing noise.
My bet is the fuel pump, but again I'm not 100%. The fuel pump is located inside the gas tank. You would need to lower the gas tank to get to it, and pumps are typically about $150-200. I hope this helps...