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Fuel Pressure Gauge

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6:00 p.m.: Next, start the engine. If you’re used to putzing around with a new carb or older EFI systems, you’ll most likely be pleasantly surprised when the engine starts pretty quickly with the Atomic EFI. With the engine running, check the fuel pressure. You’ll need at least 45 psi, and most engines will want between 50-55 psi. If you see the “INJDC” error code in the diagnostic screen, then the injectors are working too hard, and you should increase the fuel pressure in 5 psi increments.