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”

Accessing the Cabin Fuse Box on an Aston Martin DB9

Aston Martin DB9 LHD Car Fusebox Location
Fuse Box Locations

An Aston Martin DB9 has 3 separate fuse boxes, one in the engine compartment, one in the passenger compartment and the last in the boot.   You may need to access the Cabin Fuse Box for a variety of service reasons as it contains fuses for a myriad of the vehicles systems.  In addition to the fuses, this is also the location of the Fuel Pump Relay, something you may need to remove to depressurize the fuel system if you are working on your fuel injectors.

Accessing the Cabin Fusebox is pretty easy once you know where it is.  From the owners manual diagram above you’d think it was under the dash on the right.   Actually, its under the floor mat on the Passenger side, so it’s different than in the diagram shown if you have a Right Hand Drive (RDH) car.   That’s right, under the floor mat, not hidden under the dash.  Check out my video below for a clear view of where it is. Continue reading “Accessing the Cabin Fuse Box on an Aston Martin DB9”