20 PSI Fuel Pressure

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Nov 5, 2024 | 03:18 AM

raymc_s2k

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20 PSI Fuel Pressure

I have a new fuel assembly (a new fuel pump, fuel regulator, and fuel filter). The car starts just fine, and after warming up, it idles as tuned. However, the pressure remains at 39 psi. As soon as I turn off the car, the pressure drops. Is this normal? As soon as I step on the peddle a few times, the exhaust becomes rich, since the ECU detects a lack of pressure and compensates with higher fuel delivery. I have been trying to figure this out for one year, and no one, including the Acura dealership, can diagnose this. They say there is a wiring issue. Not possible. When I encountered the 39 psi, I used the original fuel-sending unit. Then I changed it to an after-market because the item is discontinued. It still produces 39 psi. I changed my troubleshooting by installing a new fuel rail because I wanted a permanent fuel gauge to see the pressure. I also took out the pulsation dampener and installed new Honda fuel injectors. Now, the pressure is at 20 PSI. I will reinstall the pulsation to the end of the new rail and see if it will push the pressure back to 39 psi. I am stumped. Can anyone from this forum provide some insights? The only thing that I have not checked is the fuel line. 2002 RSX.