Big Cam PT Pump issues

Did you look at the governor before installing it?

Might be hanging up or the wrong spring installed

 

Check for a restriction in the fuel return lines.
As for slow to come back to idle check for air in fuel coming into pump.

 

Air in the system will do crazy things.

 

There is a knurled knob on the front of the shutoff solenoid make sure its
screwed out all the way. Otherwise I suspect the sealing surface on the disc
in the shutoff solenoid is not sealing.

 

It's not that you have air in the system it sounds to me like your pump itself is sucking air.

Go underneath while it's running and shine a flashlight up there and see if you see any wetness. No leaks from the throttle Shaft or from the governor cover or plug? Are you sure you installed the filter o-ring that goes up around the threads? Recheck that your fuel line pulling from the tank has no leaks.

Common problems are that the throttle shaft sucks air because the seal goes bad, and it's also common that the fuel lines from the tank to the pump internally collapse, Make sure that your tank vent is not clogged, and it's also common that from inside the tank the draw tube actually cracks and you suck air, and the pump itself can have a problem that it doesn't pull the fuel correctly. The pump itself may need to be rebuilt. The return line to the tank has to have no restrictions also. That can also internally collapse.

You need to isolate whether it's the pump itself or whether it's a problem from the tank to the pump. Get a bucket of fuel and put it up high like on a ladder and gravity feed the pump and see if your problem stops. Set it up so that the return line runs back into the bucket. If you do this and you are still having a problem the pump itself is having an issue.

Make sure you prime the filter and you fill the fill port on the pump.

Then you will know if it is a pump problem or a tank/line problem.

 

Is there another line off the canister on the back of the after cooler or is it just a surge tank?
How many lines are connected to the fuel solenoid? Are those pictures of two different set ups - pumps?