1978 280CE not used for 5yrs Part II (Part I)

Italian tune……(injector cleaner & long hard run)

After many circuits of our block decided to give it a go (neighbours stared to give me strange looks)……..drove ~20 miles from home at up to 60mph………accelerating and changing well at first...........noticed slight miss after ~30mins……… on applying the gas at first………then increasing problems under load……….eventually refused to continue running when put in drive…. 500yds from home….walked home…….2hrs later started first pop and drove home without a problem

Further driving around the block…….similar problems after ~20mins

No overheating on temp gauge

Noted fuel pump ‘zinging’……..varying buzzing……..certainly noisier than I remember………like you would imagine if fuel vaporizing in pump

Thinking new pump, but quite expensive in Oz………would like to be sure before throwing parts at it……..may even consider buying a fuel pressure gauge if someone could give me advice on how/where to connect it and interpret readings

Electrical/Ignition problems also need to be considered

‘So near and yet so far’

Help please!!