Have 2000 V70 station wagon, non turbo. After filling it with gas it start only after pumping the gas pedal repeatedly. Than runs rough for 30seconds or so. Than runs great till the next fill up. Removing the gas cap doesn't cause the same problem. CEL is on. Code says gas/vapor recovery system has a leak. Thanks

 

Sure sounds like EVAP valve is sticking open or system has other leak; what was the code number?

Below from '95 850 manual but yours should be similar:

FUEL EVAPORATIVE (EVAP)
EVAP Valve Check
1) Disconnect ventilation hose and canister guide from
throttle body. Connect vacuum pump to ventilation (large) port and
begin pumping to obtain partial vacuum. See Fig. 5. Even though
pressure returns quickly to atmosphere pressure, resistance should be
felt when pumping.
2) If vacuum and resistance are okay, go next step. If vacuum
cannot be reached or resistance is not okay, check ventilation hose
connected to canister for damage or leakage. If hose is okay, repeat
test using new canister.
Fig. 5: Checking EVAP Valve
Courtesy of Volvo Cars of North America.
3) Apply vacuum to small vacuum port. If partial vacuum is
present, go to next step. If no partial vacuum is present, check
vacuum hose connected to canister for leakage. If hose is okay, repeat
test using new canister.
4) Maintain vacuum in vacuum hose. Blow into hose that fits
into large port. If air passes through canister with slight
resistance, canister and guide are okay. If air does not pass through
canister, check vacuum hose for blockage. If vacuum hose is okay,
repeat test using new canister.

 

codes,

P1670

And

P0440