Hi Rob, I wrote a long post the other night and it’s seems to be lost in cyberspace. My 71E has never failed to start. I have new Beck Arnely injectors just a couple months ago and they are working just fine. I don’t think 4 injectors could be bad all at once. Something is signaling the injectors to dump fuel. The suck test (sorry) on the MPS will be helpful.
The other things that come to mind are that the fuel pressure regulator is bad, I have seen a reference to the fact that it can cause fuel dumping. Also, have you checked the return line from the fuel pressure regulator that goes to the tank? If it’s plugged , over pressure can develop. Lastly a bad ECU is a remote possibility, however the reputedly rarely fail.
I understand that this is very frustrating, but there’s many a forum thread, here and elsewhere, detailing how carbs can be frustrating, so carbs are not necessarily the magic solution.
Keep us posted,
Craig
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