I`ve found that the replacement switch unit by mercruiser may only work with a relay system and not as a actual switch. I`ve started using pressure switches by Standard . part numbers are PS126, and PS127. They use the 1/8 pipe thread
One has 2 switch terninals (copper)and a ground lug (silver)should you wish to carry both the hot and ground for the fuel pump, the other has only 2 switched lugs(copper).If I havent mixed then up PS126 is the 2 lug.
and there cheaper .
One has 2 switch terninals (copper)and a ground lug (silver)should you wish to carry both the hot and ground for the fuel pump, the other has only 2 switched lugs(copper).If I havent mixed then up PS126 is the 2 lug.
and there cheaper .