Hi fella... Unless I'm miss reading this, you have put the guts and cap of the 101 3.5 pump into/onto the 3.9 housing... If that's the case, then there's your prob.. The 3.9's pump gears need to stay with that pump... Re the pump cap/filter housing that should work ok on the 3.9 if it fits.. I didn't think they did.. If it were me, I'd be running the original 3.9 pump, and a remote filter housing as pictured in Brutes reply. Easy to access, room for a huge filter, and pump as standard.
1995 Mercedes 1222A 4x4
1969 (Now know! Thanks Diana!!) Ser 2 Tdi SWB
1991 VW Citi Golf Cti (soon to be Tdi)
'When there's smoke, there's plenty of poke!!'
'The more the smoke, the more the poke!!'
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