Have you hand primed it using the handle on the lift pump? (assuming it
has one - my 2.25 petrol did!)

crack off the incoming fuel line off the carb and hand prime it until
fuel comes out of that, then reconnect and try again.

Having clear fuel lines makes fuel problem diagnosis much easier!

Dont know if this helps, but I had this on my range rover twice...

First time it was me putting the fuel filter on the wrong way round.

Second time coil was dead.

Air in the lines also sounds plausible - God ive been watching
Mythbusters to much!

Just to add to what others have said, I've heard in the past that
running the truck out of fuel can stir up crud in the tank due to the
fuel washing around on the bottom so you can end up with the pipes
being blocked, I've not seen that myself though.

When we replaced the old fuel tank on our S3 (the local 'professional'
did it ... but didn't clean the new tank out ... hence fuel pickup in
tank encrusted with crud.  Easy fix was to undo top of tank, lift fuel
pickup out, clean, replace, job's a good 'un.

'course, what everyone else has already said still applies ... ;)

 pull the fuel pipe off the carb and turnover if you have fuel healthily
squirting then probably not the pump , the old Solex were prone to a
sticking needle valve which prevents the float chamber filling usually just
enough fuel would leak past to let the engine fire before the carb
drained -in the bad old days deposits of triethyl lead also used to block
the carbs I have before now fed neat fuel into the carb throat to keep it
running until fuel pressure built up enough to clear the blockage - not
recommend as a backfire is not fun when you are squirting fuel.entertaining
but not fun
Derek.