Not that simple. Current controlled proportioning valve. That said, to answer your question, the PPS solenoid is normally closed and opens when normal polarity is applied to the + and - terminals. Although the book doesn't say it, under those conditions displacement of the needle will be appx...
Well, I owned the car 25 years. Bought it new. No O ring. In fact doesn't make sense there would be. Funny the EPC doesn't show it either. And the rear is necked down like that for stress relief...
^ Keep in mind there's more involved in holding rest pressure than the fuel pump check. Anything that leaks on the supply side (regulator back) of the fuel system can be responsible.
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