Thehappytexan

Tylerstrop, on your boat, both pumps are technically low pressure pumps. The short and fat Carter pump is there to supply sufficient fuel volume at around 7 psi to the injection pump which should hold 12 to 15 psi on your TBI engine. One big advantage with running the carter pump is that it’s made to pull fuel, it’s a lift pump. Cummins used that same pump mounted to a billet aluminum plate to lift diesel fuel from semi tanks to the engine for several years. They work very well. If you were to put a 100 micron filter before the lift pump and a 10 micron after it, that would be a nice setup. Just make sure the filters flow at least 2 to 3 gallons per minute. I have a high flow 10 micron filter setup I’m putting together for a fall project coming and will post an update when it’s time.

I know this thread is old, but being someone with experience in automotive racing and boating, I started researching the fuel pump in Indmar’s s495117 conversion kit and found some with the pierburg brand pump and some kits without. They all had the same part number, but the kit that doesn’t use the pierburg brand pump uses the Walbro gsl392 pump. The number is on the pump Indmar sales for over $300, but walbro sales it for $98. Fuel pump pt# gsl392, fitting pt# 128-3041, Order the copper sealing washers with the fitting, $ .99 each. Just have to check the box. Your not supposed to run anything smaller than a 30 micron filter pre pump, but no matter where I look all I can find for our 1/2” fuel lines is 10 micron or 149 micron. I have used the 10 micron wix 33299, or Napa 3299 for 5 years now with no issues. This is my first post and I don’t know if links are allowed, so if it gets deleted I understand. But here is the link to the manufacturers online store for the fuel pump. https://walbrofuelpumps.com/walbro-gsl392-inline-fuel-255lph-pump.html