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check the fuel pump, it sounds like as it sits its losing pressure, when you first turn the key to the on ( not start) do you hear the fuel pump running then shut off? your fuel pump should keep pressure on the line at all times, so if you do hear the pump start it should be a very brief spurt and thats it, you can have the pressure checked at many repair shops for free or low charge,
Check your starter and check your connections to make sure they are clean and tight. The low fuel pressure won't cause a no crank. Too low could cause a no start but not a no crank. I've had starters be bad right out of the box. But if that starter motor isn't turning either the starter motor is bad or the solenoid attached or the wiring to it is at fault.
usually the starter itself try tapping it with a hammer if you can access it easisly tap the top of the starter the solonoid. thats where the clicking is coming from. also make sure your batery it fully charged that will give you a clicking also.
If the vehicle doesnt turn over make sure the battery is fully charged.If charged and still doesnt turn,(if the vehicle has a security system) check and make sure the starter kill feature is disabled (check vallet switch).If it cranks and doesnt start to check the fuel pump you can have someone turn the key to the on position while you put your ear close to the fuel tank to see if you can hear the pump (you should hear a buzzing sound for 5seconds after the key is turned to the on position).This is a tuff call. You need to find out what the lot did when they put the GPS on the vehicle
Have you hooked up a fuel pressure gauge to the test port on the rear of the intake, drivers side. You can get a fuel pressure tester for about 40 dollars at a part store. It is a real good tool to have in your toolbox. If your Jimmy can't build 55 psi, it won't start.
firstly where is fuel pump relay as i have never seen a GMC jimmy sorry about that but have you ever seen a foden ?? well the first thing is to check the fuse,if fuse is ok which can be checked by looking at it as its transparent or a piece of wire with a light bulb .across the battery.to find the relay is easy if you dont know where it is,When this piece of americana decides to work just turn ignition on and listen for the click of relay ,then when it doesnt start listen for click again or rather an absence of a click,sounds more like a dodgy pump in the tank or the connections going to it.when it wont start try thumping the fuel tank with the ignition on and if it is a sticky pump you might hear it start then at least you will know where the fault is.Another fault that i have come across with relays is that where the relay is passing a heavy load then its possibe for the contacts to burn inside the relay.When this happens then if it is possible to seperate the relay cover and clean the contacts with a points file (remember them ) or a piece of fine emery paper if the cover breaks taking it apart then use a bit of black insulating tape to repair the cover.Thats assuming the pump is in the tank and not bolted to the chassis near the fuel tank but that design with external pump i havent seen on a europeon car for nearly 20yrs .