DFCO vs Fuel pressure question.

[realcanuk]

2007 Corvette, E38, return fuel system...

I notice that my car holds 58ish lbs fuel pressure almost all the time but something I don't understand. Is it normal that when I release the throttle while cruising, and the car goes into DFCO mode, the fuel pressure jumps up.

Thanks.....

[pannetron]

Short answer, yes. When DFCO kicks in the engine isn't consuming any more fuel. The fuel pump controller isn't quite fast enough to turn off the pump before there's a small spike in pressure. As long as the pressure quickly drops back to normal after DFCO kicks out all is good.