Will a bad FPR cause to run rich? Or do they ever go bad?
#2
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I have replaced several stuck FPR's in Volvo 240's over the years for causing such a rich condition that they would not even start, but our cars, I do not know if they fail. The way to find out would be to check the fuel pressure. That is probably not much help, sorry :>/
#4
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The FPR can certainly fail. In my old A4 my FPR would instantly flood my engine to the point where it would not start. I chased that bugger for 2 weeks trying to figure it out. If a stuck regulator can flood an engine to the point it won't start I can certainly believe it could cause you to run rich.
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