Hasdrubal
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I had the fuel cap issue also, with excessive vacuum. If I cracked the cap when I stopped it would fire up in the morning. If I left it, it lost prime. One of the reasons I ended up on this forum back in 2006, trying to find answers to puzzling issues like this. At the time didn't consider trying to clean the valve, don't remember anyone recommending this. Got tired of bleeding the injectors, whenever I forgot to crack the cap. So..field expedient modification. Ended up drilling a tiny hole in fuel cap, then sourced a new fuel filter base which had a tiny weep of fuel on the back.