Installing the Fuel Injectors and Fuel Rails in an Aston Martin DB9

If you’ve had your fuel injectors out as part of a larger project (like me dealing with a Lumpy Idle situation) or maybe you are just changing one (or more) of them, you need to know how to properly prepare and install them.  Your tasks will include getting them properly mated up with the fuel rails again, plus making all the electrical and vacuum connections.   Needless to say – I have a few tips to share. Continue reading “Installing the Fuel Injectors and Fuel Rails in an Aston Martin DB9”

Disconnecting the Fuel Rails and Removing Fuel Injectors from an Aston Martin DB9

Fuel Rails unmounted

You might be needing to disconnect the fuel rails to change one or more fuel injectors, or perhaps to dig further into the engine removing the Intake Manifolds as part of changing your Coil Packs, Spark Plugs or perhaps your PCV Valves.   It’s not a difficult task once you have the prerequisites listed below out of the way.

Note:  I will be explaining how to unmount the fuel rails and disconnect them from the fuel injectors, but NOT how to completely remove the fuel rail.  God help you if you need to actually remove the rails entirely.  At the very bottom of this article I will regurgitate the instructions from the Aston Martin Workshop Manual, but I can tell you know it’s probably impossible to do this with the engine in the car.  I bought the special tools and was going to try but waved off after seeing mission impossible in front of me.  I found it was totally unnecessary for the service tasks I noted above.   We can make do with them loose and able to swing side to side. Continue reading “Disconnecting the Fuel Rails and Removing Fuel Injectors from an Aston Martin DB9”

Depressurizing the Fuel System on an Aston Martin DB9

Aston Martin DB9 Fuel Charging SystemYou may need to depressurize the fuel system on your DB9 if you are going to do any work with the fuel rails or fuel injectors under the hood.  I am doing this as part of changing my coil packs and spark plugs, but you might be wanting to change a fuel injector or various other engine service tasks.  Normally the fuel system has ~40psi of fuel pressure (even when turned off as residual pressure), and if you are going to disconnect something with the fuel system under the hood (bonnet), you don’t want the risk of it spraying you, your car, or worst of all causing a fire.

Depressurizing it is fairly simple.  We are going to run the engine out of gas by removing a relay that operates the fuel pumps.  No fuel = no pressure.  Easy. Continue reading “Depressurizing the Fuel System on an Aston Martin DB9”