key on engine off psi fuel spec is 35-45 engine running 30-40 psi don't think 20psi cuts it, lucky it runs, when i do injector flushs i can go as low as 25psi some times before engine stalls if you pull off the vaccum line at the regulator do you see or smell fuel?maybe a bad regulator or the new fuel filter? you can buy real junk for filters.
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