If the spoonful-of-fuel test is successful Ty, take a look at the PulsaJet's fuel intake screen, it may just be clogged up with grass. You don't have to do any more than separate the tank from the carburetor, tip the carburetor upside-down, and take a look at the pick-up tube. Of course you'll see the condition of the diaphragm when you do that anyway, and it doesn't take long to check that the mating surfaces are both flat, but bowing makes the mixture rich, not lean, so it won't be the problem.
