Sorry didn't realize I had selected wrong category. 1997 150 EFI #0G540449. Would not start, fuel pressure about 15 psi. Found more oil than fuel in vst. Drained vst and pumped fresh fuel into and fuel pressure came up and motor started. Let sit for 2 days and did same thing. I suspected the valve on bottom of vst but I had one go out on a previous motor and it pushed fuel into oil line and oil tank on motor. Can oil get past the mechanical pump when not running? I thought the valve on vst was just a one way valve to let oil in and block fuel out