porcupine73 Posted June 11, 2007 Share Posted June 11, 2007 Hi. At idle I am reading about 32 psig fuel pressure. The manual says it should be between 30-34 psig, so this reading seems OK. At full throttle (nearly zero vacuum), I am reading maybe 37psig. This is the highest I've seen it get. The manual says it should be between 41-46psig. Do Subaru fuel pressure regulators go faulty very often? Or maybe my gauge isn't very accurate (cyberdyne digital; not sure how accurate it is). I don't think my filters are causing any issue. If I run the key from acc to run a bunch of times without starting (zero vacuum), the highest pressure I read is 37psig. Should the fuel pressure bleed down from sitting? Before I cycle the key, the pressure is very low. Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted June 12, 2007 Author Share Posted June 12, 2007 Well I went out and clamped off the fuel line after the filter. I went key acc to run for just a second and the pressure went to 61psig, so it appears the fuel pump isn't the problem. I pulled the vacuum hose to the fuel pressure regulator and put some seafoam down in there. After that the peak reading I can now get is 41psig fuel pressure vs 37psig before. I'll see tomorrow if is any higher after the seafoam soaks in the regulator overnight.... Quote Link to comment Share on other sites More sharing options...
nipper Posted June 12, 2007 Share Posted June 12, 2007 Fuel pressure regulators do go bad. nipper Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted June 12, 2007 Author Share Posted June 12, 2007 Cool thanks nipper. I hadn't seen many posts about them. I guess I'll see how it reads tomorrow. I see the list on the oem fpr is nearly $100... Maybe the seafoam will free it up a little or something. Quote Link to comment Share on other sites More sharing options...
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