I am measuring the pressure at a port just under the radiator cap on the radiator.  I have a “T” there and the pressure sender is on one side and the other side is connected to a hose going to the small (1/4”?) port at the top rear of the rear iron.  This hose is to bleed off any air in the block---hope!

I am also thinking that this pressure is too high, but I don’t know why.

 

Bill B

 

Bill, where are you measuring your pressure? If you measure in the block or at the pump outlet you’ll get unusually high, false readings.

With a 22 lb cap you can’t actually achieve 27 psi, as the cap will burp it to the over flow and reduce the pressure.

I suggest you measure the pressure from an expansion tank connected to the inlet side of the pump.

The stock Mazda cap is only 13 lbs … there is no reason to see even 22 psi.

JWW