I rebuilt mine a while back. You pump slowly until they pop. On my 240D non-turbo they pop around 1600 or 1650 psi - can't remember. They aren't supposed to leak any fuel. You have nothing until it pops and then you're supposed to get a mist. They should all be set within around 50psi of one another. You can buy a shim kit to adjust the pop pressures. Hope this helps.

Scott

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Scott
1982 Mercedes 240D, 4 speed, 275,000
1988 Porsche 944 Turbo S (70,000)
1987 Porsche 911 Coupe 109,000 (sold)
1998 Mercedes E300 TurboDiesel 147,000 (sold)
1985 Mercedes 300D 227,000 (totaled by inattentive driver with no insurance!)
1997 Mercedes E300 Diesel 236,000 (sold)
1995 Ducati 900SS (sold)
1987 VW Jetta GLI 157,000 (sold)
1986 Camaro 125,000 (sold - P.O.S.)
1977 Corvette L82 125,000 (sold)
1965 Pontiac GTO 15,000 restored (sold)