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SXF Fuel Pressure Regulator with PICS

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I have another post titled SXF dies when throttle given.

I think ive narrowed it down to the fuel pressure regulator but need someone who is familiar with the way the regulator operates to clarify some things.

Pulled my 250 sxf regulator out. Added "slight air pressure" to o-ring port and get air coming out the top.

Added about 65psi air to the side pipe and no air flows and or comes out any port.

Shouldn't I be able to take a punch, screw driver or similar tool and push the plunger inside from the o-ring side and compress the internal spring??? I can't get anything inside to move, no matter what end I push from with a tool.

It's my understanding the fuel pressure enters the o-ring port, builds pressure, collapses diaphragm spring and allows full to exit the side pipe. If more than 50psi builds, it bleeds out the top and excess fuel dumps back into the tank. Is this the correct process?

 

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I would buy a new one

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Yes I plan on it...if I can find it seperate from the entire fuel pump assembly....

But shouldn't I be able to move the internal plunger by pushing on it with a small screw driver making the spring inside compress and expand ? If I could trouble shoot it and figure that out, I would definitely know if this one is faulty or not...because I can't get anything inside it to move at all.

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