I have come across a couple older outboards, a Elto & a sea king, and a older chrysler. over the last few seasons and I knew the fuel pumps should be replaced just because of their age, I have read a couple post where folks have made there own diaphragms because the pump was very costly, hard to find or no longer available for their motor. Was wondering if anyone had information where to purchase this material on-line. I went to local NAPA & they said they did not carry it. any info much appr.