Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post

Shahano · 04-23-2021, 12:51 PM

Hi All,

I am having a problem with a huge fuel pressure drop at Idle after having a few drift runs under the belt (50-51 psi at idle during normal operation, and after a few runs, Idle pressure drops to about 40 psi) and causes the car to run lean. I checked all various issues and changed my fuel pump (DW300C) and while the car is running perfectly well, for the first few runs, pressure drops once the fuel gets very hot.

Has anyone had this happen before? Any other ideas why the fuel pressure might drop this much?

Some background:
I am running a LS3 in the BRZ, and do not have any heat wrapping on the headers nor exhaust. Stuck fueling system other than the dw300c fuel pump.

04-23-2021, 12:51 PM	#1
Shahano Member Join Date: Sep 2019 Drives: LS3 Dry Sump BRZ Location: Beirut, Lebanon Posts: 34 Thanks: 3 Thanked 7 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Fuel Pressure Drop on my LS BRZ Hi All, I am having a problem with a huge fuel pressure drop at Idle after having a few drift runs under the belt (50-51 psi at idle during normal operation, and after a few runs, Idle pressure drops to about 40 psi) and causes the car to run lean. I checked all various issues and changed my fuel pump (DW300C) and while the car is running perfectly well, for the first few runs, pressure drops once the fuel gets very hot. Has anyone had this happen before? Any other ideas why the fuel pressure might drop this much? Some background: I am running a LS3 in the BRZ, and do not have any heat wrapping on the headers nor exhaust. Stuck fueling system other than the dw300c fuel pump.