I did not say a few gallons of diesel. Anything from 1-3 quarts, on an empty or nearly empty tank, with an immediate top up of regular gasoline. I.e. you are moving from one pump to the adjacent one and doing this. This cleans our your fuel system all the way to the injectors and is worth alot more than the couple of ounces that you get with commercial FI cleaners. higher volume of cleaner = better cleaning. Figures.
The diesel crankcase flush can be done on any vehicle as well. This is an engine flush. It should be obvious why an engine flush is a good thing. 1 quart of diesel is really cheap and since you're only using it every time you change your oil out at 12k-15k miles (if you are using fully synthetic fluid) it is a mild expense and inconvenience.
Your first priority is to kill all the no start issues. Source for an purchase all of the items on line. When you have them ready, get to them immediately. If you had intended to do your engine belts, WP and fan clutch, do those as well together with the CPS swop as you'll be removing the fan clutch and shroud and that makes replacing the CPS much easier. The CPS swop, fuel pump/pump o ring swop, electrical relays, fan clutch, water pump and (for good measure and because it is like only $20) the thermostat, should take a skilled diyer about 4 hours at a relaxed pace with adjournments to the BBQ set up nearby. Oh yes, get a new rad cap, bleed screw, flush out your radiator, and use cheap, birghtly coloured and strong smelling coolant from walmart. Like I said, will only take you around 4 hours to do all of the above so you can sort it out in one weekend.
This will pretty much eliminate all of the known and common no-start issues with your car, along with a partial refresh of your cooling system which is the next biggest annoyance with our baby.
Then, you can do all the other things down the line when you have time to inspect the car's undercarriage and have strategised everything you wish to do and when.
Please read through the sticky threads at the top of the forums for more useful information.
Read through Bentley's procedures on each repair before you do anything, and its a great idea to have a reliable torque wrench and extra hose clamps on hand to do things the right way first time.
Oh and btw get and keep a set of car fuses in a plastic bag, in the fuse box. Anything electrical that stops working, the fuse box is where you should check first and swopping out the busted fuse usually fixes the problem permanently. If the fuse keeps blowing, then you've got a component problem and you need to think about that.
rgds, Roberto
p.s. Change the upper and lower rad hoses if their internals are caked with rust or they feel too hard and brittle to the touch. The hoses will run you $20 each and last for 10 years so its no biggie.