Zd30 d22 looking for advice

Hello, i have managed to search and look up some remedies for the codes i am getting but still no start.
Would anyone here be willing to work with me and help me rectify my no start?
I just thought I'd ask knowing this is a patrol forum 😉
She was starting and running fine, then at idle at the market she just died... on site mechanic says look at pump but i just want to look at anything else before i commit 5g on a pump injectors timing chain etc etc

My first scan with ecutalk showed codes 31 and 71. I cleaned earthes i could find, replaced battery with a 810cca, new terminals, re set ecm and scaned again, no start but another cide to go with 31 71 is 47 ??

Please any thoughts on this would be appreciated.. thanks vic

Check all of your fuses. Sometimes a blown fuse (which at times seem to blow for no reason) will stop the engine from starting. If they all check out OK, use a spray of aerostart into the air inlet and see if that gets it going.