What are these valves called and how do I loosen them?

[Charlie]

I would use Permatex aviation #3 instead of teflon. A good all around product.

[David M]

Charlie is exactly right.

[SailorHarry]

Replace these old valves and go out and enjoy your boat, that is, unless you prefer to stay tied up to the dock, working on your boat (not a criticism, just an observation. West Marine and many others carry these valves, or you can have a look at Anderson Brass Company's multiported valves and clear out this manifold and multiple valves.

[zeehag]

they are called awesome and have you tried pb blaster or lube on em?? if not--why not???/ will work.

[perchance]

Originally Posted by noelex 77

When you replace them do not use white Teflon tape on the fittings.

Never ever use Teflon tape on a fuel system, even a tiny amount of tape making it into the fuel system can be disastrous. You can use pipe dope compatible with the fuel you are using.

[zeehag]

and do lube the moving bits so they keep moving.

[David M]

This thread was started in April of 2012.

[sdowney717]

for the benefit of anyone who has these valves.
They are spring loaded tapered cylinders sitting inside tapered cylindrical bores.

So, pry slightly between the handle and nut and they will lift out slightly from their tapered walls, then exercise the valves and they loosen up.

[ggray]

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?

[glenn.225]

Yes, 1/4" valve passage way is lots for a small diesel. Larger units may need more fuel for cooling/lubrication but it'll be fine on yours.

[ggray]

Glenn
Thanks. I've got some on order.