It shouldn't. a 255 pump should have at least 70 psi open pressure. And it should be able to move plenty of volume at 40 psi. You may have a pick up problem in the tank or pump maybe going away on you
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Bill Heiser
90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter
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