Overview Reviews Similar Products –> Product Description Note: This only fits a small subset of generators with the 990 engine and Evolution 1 controllers. If you have any questions about whether this is the proper fuel system for your generator, please use our What Generac Part Do I Need form . When a generators engine doesnt run smoothly or seems inconsistent under load, uneven fuel pressure can be the hidden culprit. The Generac 0J9045 Assembly Fuel Pressure Regulator with Plenum is a genuine replacement part that manages the fuel pressure delivered to your engine, helping it run with steadier performance. Without a functioning regulator, fuel pressure can spike or drop unexpectedly, which may make starting harder or the engine less responsive during demanding conditions. A generator fuel pressure regulator maintains the fuel flow at the right level, so the engine runs efficiently and without hesitation. It reacts to changes in engine demand, so
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