574,d239 engine, fuel return check valve psi?

maplehillfrm · Aug 21, 2009

I took the check valve out today IH#528929R1,,the bottom of the tank had some gunk in it,

I tried to apply pressure to the inlet of the valve, it was on my workbench, I started low pressure and had 120psi going into it without the valve popping [to let the return fuel into the tank] I wouldnt think it needs that kind of pressure for a return line??

anyone know what pressure is needed to activate the valve.. I am going to buy a new one but was wondering if I can check this anyway,, tahnsk pat

MN Scott · Aug 21, 2009

Never worked on a 574 but on my 756, 1066 just a few PSI will unseat the valve. I think mainly the weight of the fuel on the valve.

JimB2 · Aug 21, 2009

Hi, I believe the part you are referring to is just a shut off valve for the fuel tank. If there is any fuel return check valve it is in the T with listed under D-239 as:
Item 4 3055739R1 UNION UNION, special tee
This is located at front of battery box where fuel return line from injectors join fuel line back to fuel line.

JimB

574,d239 engine, fuel return check valve psi?

maplehillfrm

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MN Scott

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JimB2

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