Subject	Why does this concern you so much?
Posted by	lazer(AK) on September 03, 2008 at 7:30 PM
	This message has been viewed 143 times.
In Reply To	Fuel Pressure Drop posted by harrybc on September 03, 2008 at 04:41 PM
Message	The fuel system in the Z is a return system, not a dead head. Fuel that enters the rail, which is not used by the injectors, returns to the fuel tank via the fuel pressure regulator. The fuel pressure should drop after engine shutoff. Now their are check valves in the driver side rear wheel well. I believe one it the rollover valve (designed to cut flow if the car is inverted). Now the TT does have a pressure tank that is designed to store some boost pressure and reapply it to the Fuel Pressure Regulator at startup if the engine is warm. This is to prevent vaporlock (which was never an issue for me in the Las Vegas heat). Check your fuel pressure with the ignition key on but the car not started. You should see around 43 psi. If not then your fuel pump is going out. "The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace." - Automobile Magazine
Follow Ups	Fuel Pressure Drop - harrybc 16:41:06 09/03/08 Why does this concern you so much? - lazer(AK) 19:30:20 09/03/08 Re: Why does this concern you so much? - harrybc 20:14:12 09/03/08 If you don't get the FP "twang" when turning key to ON - BobbyT 00:25:52 09/04/08 Re: If you don't get the FP "twang" when turning key to ON - harrybc 00:40:53 09/04/08 A bad injector or leaking injector "O" ring may be your - RHulme 11:24:48 09/04/08 It's your fuel pump or the controller - lazer(AK) 15:05:15 09/04/08 Pressure at idle should not be 43psi - lazer(AK) 14:58:26 09/04/08
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