> MessageThis may have already been suggested, but where did you run the block vent from the top of flywheel end of engine?  Should be connected to high point of cooling system.

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> Tracy

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That vent is my only vent from the system.  It goes to a small surge can with a 16 psi cap which vent to 2 larger pressurized cans on the firewall.

 

Dave Leonard

 

Unless I misunderstand (I remember this happening once J) this is like no vent at all; unless the cap is off the surge tank.  Yeah, I know you know that, but we’re kind of out in space here trying to figure something out.  It seems that without a vent at the exit from the pump there will be some air trapped in the pump – no?  

 

A nice way to put in a vent at the pump outlet is to install an AN plug with an o-ring seal.  Drill into the bottom of the plug, and then right angle to the side just below the o-ring.  Back off the plug a couple of turns when you fill to bleed air, tighten it down to run.  (Photo attached)  I have a second one that has a shrader (sp?) valve welded into it so if I need to pressure test the system, I can just swap plugs.

 

Al