Originally Posted by barry12345

I believe the springs might have originated from the suppliers of the relief valves in two lengths. Perhaps two suppliers? So the length to seek depends. I am not positive of this. Yet there seems some conflict.

I cannot believe that some of the springs sag to the exact same length. I guess it is possible though.

Actual pressure readings obtained with a gauge are a better methology. If one is aware of basically how everything impacts each function. I think the typical case is a person might stretch the spring back to whatever normal is. Without observing there was fuel overflow first or after.

The valve was not active because the system operational pressure was not adaquate. So no change is observed. As nothing has really changed.

Or the system may process enough fuel volume at idle and fall much flatter at higher speeds. So we in fact have absolutly no ideal of what some of the stretched springs release pressure really is.

Otherwise just stretch the spring to the manufacturers suggested length to compensate for the ageing sag. You should really have a gauge installed to go beyond normal.