case 580 ck, runs a while, shuts off, hard to prime, repeats action
Make sure fuel return and vent is a good and clean...check valve is not stuck closed
Check return line fitting at pump there is a check ball that can get stuck because of gov. ring in pump is coming apart. Pump will have to be removed and rebuilt by a pump shop.
Check the "return connector" ON TOP of the inj. pump.. Remove all the fittings off the top of the pump & start the engine.. & reinstall 1x1 & see which one shuts it down.. I'll bet its the first one..
Make sure there's nothing in the tank blocking the pick-up.