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I believe he is saying that in the early model powerstrokes, the anti-drainback valve was in the hpop itself, whereas in the later model, as a '99 would be, the drainback valve was in the front cover. I would also recommend installing an Adrenaline HPOP as was previously stated. Check out dieselsite.com, they sell the Adrenaline pump and they can answer any questions you have regarding hpops.
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'94 F250xlt ext. cab. ZF5-speed 4x4. EBPV delete. DPP downpipe. Tymar intake. Tymar coolant filter. Type 31 batteries. LF9691 primary filter. Electric fans. 10k mod. 1.0 turbo housing. Boost blanket. Over-axle exhaust eliminated. Electric fuel pressure gauge. Heim joint clutch linkage. Adrenaline HPOP. BDP modded IDM. LUK SMFW. DIY Elec Fuel. FS1282, FF5320 fuel filters.
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