I know this is an old thread, but this is what came up in my search for new fuel line shut off valves next to the tank and filter.
I have 5/16 lines to my Yanmar 3GM30
engines, and to make the Racor
and fuel valve "system" a more compact and less vulnerable package, I want to re-plumb with smaller valves (they are 1/2 inch now) and smaller/shorter pipes between.
The valves pictured below look very similar to some made by Anderson brass that I'm considering
SHUT-OFF VALVES VALVES : M670 Series | ANDERSON BRASS
But I just discovered that even if I order these valves with 3/8 pipe fittings, the hole through the middle of the valve is the same 1/4 inch as the valve with 1/4 inch or smaller fittings.
So is that big enough? Considering that the hole through the 5/16 barb fitting can't be much if any larger, I'm thinking that these valves would not cause any significant restriction to the flow.
How big a valve should I need?
Originally Posted by PamlicoTraveler
These fuel valves are for selecting the fuel tank
and returns. They are getting harder and harder to turn. I am not sure what they are even called.
I loosened the screw on the one on the right as pictured but that just removes the knob itself. I feel like it is requiring excessive torque to turn them now and I don't want anything to break. I sprayed some 6-56 in it but it didn't seem to help. Do I need to replace the whole valve and if so what is it called?