Join Date: May 2001
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Re: 1989 GMC JIMMY
Let me preface with this is a guess...
Depending on how long it sits, you may have leaky injectors that do not hold the pressure. In other words, when you shut it off, the fuel behind the injectors leaks down and evaporates before next time you come out to start.
That doesn't really address why the fuel pump wouldn't pressurize the lines when it gets turned on, though...