I'm restoring a 2002 FLHTCUI that sat for many years in a neighbor's garage. First major project was rebuilding the fuel pump assembly. With the assembly complete, I've attempted to "trial" the pump outside the bike by submerging the strainer in bucket of gas and hooking the power cord from the bike. The pump will cycle on for 2-3 seconds and then shut off when I engage the run button. No gas is being pumped through the line. I expected it would pump gas through the assembly and back into the bucket since there was no pressure until I turned off the switch. Not the case. Should I cover the exit hole on the regulator to create a vacuum? Little help here, if possible... thanks!