So I replaced the fpdm. Before replacing it I checked voltage to the plug and was getting 12.26 volts. So decided to replace the fpdm because it was cracked and corroded which is common on these trucks. Once new one was out fired right up and ran for maybe a minute or two then died. Checked fuses and relays and all is good there. Now I'm not getting voltage to the plug for fpdm. I checked the fuel inertia switch and I can push it down but it will not stay down. Is it suppose to stay down or what? Any other suggestions to check?