-8 and a roll over valve. Put a loop in the hose and a filter on the end, a plastic gasoline filter works fine...
I wouldn't put a loop in the vent line. If gas gets in there the loop will work as a trap and wont vent properly. I ran mine up high in the trunk and through the floor with a bulkhead fitting.
The vent only needs to be big enough to let air into the tank to make up for the amount of fuel the engine uses plus a very small amount for evaporation. The size of the fuel pump makes no difference. You are only trying to let enough air into the tank to make up for the fuel that leaves the tank and doesn’t return. A -6 is more than enough for this application.
I dont understand this. Its the quantity of flow out of the tank that matters. Why would the style of pump determine that on any given engine?Be safe run 2 -6. Pump size and style are what are important to know how much venting. Mechanical need a ton, in tank electric, not so much.
Belt driven mechanical pump needs to be gravity fed, known to cavitate when it has to try to pull fuel into it. Also fuel has to travel a few inches to feet to get to the pump itself. An in tank pump has a constant supply right at the inlet amd dont have a problem pulling fuel into it itself.I dont understand this. Its the quantity of flow out of the tank that matters. Why would the style of pump determine that on any given engine?