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Zero fuel rail pressure with ignition off.
Posted: Tue Dec 01, 2009 8:11 am
by trakkies
I have an adjustable fuel pressure regulator fitted with a pressure gauge. Before fitting the MS, this would show some pressure for hours after the engine was stopped. Now it goes immediately to zero. Is this some quirk of the MS - or has a fault developed? There are no fuel leaks showing - or smelling.
Re: Zero fuel rail pressure with ignition off.
Posted: Tue Dec 01, 2009 8:24 am
by Matt Cramer
Make sure the injectors do not get power when the ignition key is off. Some cars are wired like this from the factory, and in that case the MegaSquirt can hold them open when the engine shuts down.
Re: Zero fuel rail pressure with ignition off.
Posted: Tue Dec 01, 2009 8:46 am
by trakkies
Matt Cramer wrote:Make sure the injectors do not get power when the ignition key is off. Some cars are wired like this from the factory, and in that case the MegaSquirt can hold them open when the engine shuts down.
In this case they are wired from the main relay which is controlled by the ignition - same as the original setup.
I didn't think it was possible for tne MS to do this without having some magical internal supply - but just checking. ;-)
Re: Zero fuel rail pressure with ignition off.
Posted: Tue Dec 01, 2009 11:23 am
by Matt Cramer
Ok, sounds like this may be a fuel system issue then.