Here's one for ya Dan.
I recently upgraded my old FASS 95 to one of the new FASS 150 models with the unserviceable motor. Much quieter motor by the way. :thumbsup The new 150 makes less racket than my old 95. Anyway….I was looking forward to getting the pressure output up to 30psi on this one, but it seems to be stopping at 20psi.
I took the stock pressure spring out and put in a spring that was a little stiffer and 1/4 again longer than the stock spring. That took pressure from 15 lbs to 20 lbs. I swapped again with a spring that was 1/2 again longer (getting pretty long at this point) than the stock spring and pressure still stopped at 20 lbs. I then read somewhere that the new FASS units may have some kind of safety valve? in them that will bypass fuel to protect the motor if pressures go too high. Suppose to keep amperage draw down or something. Could this be what is keeping pressures at 20psi? If so, then I assume 20psi is DPP's max recommendation for pressure out of this motor with reliability/longevity in mind?
Thanks!
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03, 4X4, QUAD, LWB, Standard Output, 47RE, 3.73, ATS TC/VB, DTT Trans/Billet, Flex Plate, TorqLoc, RAD, Twins, Snow, Hot Cp3, Injectors, Cam, 315s, 8,200 lbs wet.
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Last edited by AK RAM : 05-04-2006 at 07:54 AM.