55 Ist series 3600 235ci stock 6 volt etc.
Fuel in filter is 1/4 in. from bottom, mounted vertical. OK by wicks filters. Bubbles in filter are coming into filter from fuel line. Bubbles also in glass bowl of fuel pump. Coming in intake side. Is it sending unit leaking air inside tank????
Last edited by Dennis Lorton; 01/25/2019 12:17 AM. Reason: clarify