if your fuel pump is working, can i ask on the return fuel pipe have you got it connected to the orginal valve that sat on the orginal car (mounted very close to front subframe) for it to return when engine is on boost into main line? won't run any sense if this device is not fitted.
if you have fuel pump problem i use an inline external pump (walbro) and never had any issues from these running a 300bhp volvo to a 50 hp micra all on same pump
as to the starting running issues can't help much here, but is it immob related maybe?
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