So a couple weeks ago my walbro 430 fuel pump stopped working. Verified it was getting power and was grounding. Threw another 430 in and it started up and worked great. Tested the old pump and everything looked good, tested it and it was shorted. sits for a week and I go to start it and nothing. Same deal, verified power and grounds. Has anyone else had issues with these pumps? Any idea why it keeps shorting? Thanks.