ys fuel Issue

[Black hawk Down]

700, YS

Im getting pressure from the engine filling the tube on main tank, but no pressure out to the Header tank.
I can disconnect line from header tank and run the header tank dry, eventhough the line coming out of the main fuel tank is disconnected, no fuel is pushed out.
I pulled the line off and blew into it and fuel came out, started the engine, Pressure was coming out of the line from the engine.
I can pump fuel in and out with my fuel can, all filters clear.
would a partial blockage somewhere cause this?

Also, as far as Inline metal filters go. I checked it, clean. inside I saw a spring and center floating part,
are they designed to flow one direction only or flow freely back and forth.


Thank you

[george0079]

The check Valve is only flows one direction

[Black hawk Down]

a hobby store operator told me yesterday otherwise, but I had my doubts, thank you.
is the check valve necessary on the Ys,

[george0079]

yes. it is a must. it is what maintains the preasure in the fuel system.

[Black hawk Down]

I took mine apart, it flows both directions, I hope this is a cheap Fix for a change.
"what you dont know will keep you where you are at"

Thanks Steve.

[george0079]

A new check valve runs about $7. You might want to pick up a couple of them. They can go bad. I change mine about once every 6 months, or so.

[Rototerrier]

I checked mine before installing...could only blow in one direction. That really sucks if you got a bad one. Sounds about like some of my luck.

[HELINHAWAII]

Maybe try to disassemble(if you haven't already) the check valve and ensure it's not clogged with something that may have gotten in there during production or shipping.

[rcmarty]

did you take it apart and blow through both pieces ? (don't do this by the way)

I did and the thin small clear !! piece that maintains the seal went flying. Luckily i took my other one of my 50 apart very slowly and see hoe it was made up. Found the little thing on the floor after a while with a flashlight and i've been good.

the little file mark / cut mark side goes to the engine , if backwards it will block all pressure.

Martin :)

[ErichF]

Also, as far as Inline metal filters go. I checked it, clean. inside I saw a spring and center floating part,
are they designed to flow one direction only or flow freely back and forth.



That metal thing is not a filter, but a check valve. If you took it apart, that's probably why it allows flow in both directions now. Get a new one and don't take it apart. If you suspect a blockage in it, hook it up to the output of your fuel pump and blow a liberal amount of fuel through it to clean it. Never a reason to break them apart. I found this all out the hard way, in fact.

[Black hawk Down]

Check valve is definitely Bad.
do I need to buy a specific one or is it one size fits all?

[george0079]

the YS check valve is best. But, any of them will work

[ErichF]

You really should use ONLY YS check valves. They have a specific cracking pressure that will prevent splitting your fuel tank, in some cases.