Mitsubishi: 1992 Diamante ES

My diamante began stalling for no apparent reason, would restart
immediately and contiunue driving. This continued till I made it
home, then it will not start at all. Replaced fuel filter, not
clogged, replaced fuel pump, not the problem. Has spark, timing is
fine. Engine turns over, but will not even sputter to start. Is it
the ECU?

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Scubaguy wrote: 
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do 

This is primitive but I would first unhook the line that feeds back to
the tank. I would then place a short piece of tubing with one end
blocked on the outlet nipple of the regulator. Make sure it is clamped
and will hold pressure. See if it starts. If it is a vacuum actuated
regulator pull the vacuum hose off and see if there is any fuel in it.
That would tell you if the regulator diaphragm is leaking. Might be
some electric thing with the injectors too. If you have a helper and a
stethoscope have the helper crank the starter and listen around the
injectors for a regular clicking sound. You should hear something if
they are opening. Again primitive!