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Showing results for tags 'bad FPR'.
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I finally got my AEM UEGO hooked up yesterday and my AFR's were initially a little erratic. As the car runs for a few seconds the wide band shows AFR's between about 14.5-16, and sometimes it completely stops reading momentarily (goes way lean) and then goes back to that same readings. I just put my fuel pressure gauge on and it was reading 21 psi with the vacuum hose attached and 30 psi with it off. Obviously this is symptomatic of a bad FPR. However could a vacuum leak cause this low of pressure? I thought I saw somewhere that a NA FPR was the same as a Turbo, however the FPR off my 77 set up has two feed lines and the Turbo one on the car now has 1 feed, 1 return and 1 vacuum.