Fuel Pressure Readings 2003 yamaha ox250

[xltier]

can someone tell me the right specs for fuel pump pressure.i check at the pump and its 50-55llbs. At the test port I get 35 with fuel regulator vacumn hose disconnected. Not really any vacumn there anyway.Hose goes to the intake on opposite side of moter also.

 

[xltier]

can someone tell me the right specs for fuel pump pressure.i check at the pump and its 50-55llbs. At the test port I get 35 with fuel regulator vacumn hose disconnected. Not really any vacumn there anyway.Hose goes to the intake on opposite side of moter also.

if I apply vacumn to the fuel regulator the pressure drops.

 

[xltier]

if I apply vacumn to the fuel regulator the pressure drops.

I have found out that it is correct. automotive is opposite