Ok I bought a ZD28 with a bad hydro about 6 months ago and rebuilt the hydro system on the machine. Machine had 640hrs. When I rebuilt the hydro I did not clean out the fuel tank. ( dumb looking back) It had been sitting for some period of time before my purchase. After getting it all back together the machine ran great several times. The third time it started to sputter and lose power after mowing an hour. I limped it back to garage and checked fuel filters they seemed dirty. I replaced them and checked the fuel flow and it seemed to improve. The machine ran well another couple times but now is doing it again. The filters looked clean but I went to investigate further. I replaced the filters but the pump only seemed to have a trickle coming out. Even with new filters Also when disconnecting tank line to first filter (under motor) there was only a trickle of diesel coming out hose not great flow. The other thing that’s weird is the fuel pump never cuts off.... isn’t it supposed to cut off once pressure is primed? Also the second fuel filter before the pump only seems to be half full and always has air in it. Could the fuel pump be sucking air in? Cracked hose etc?
I replaced the fuel pump and it didn’t change a thing. I also cleaned the fuse block, replaced fuses and checked connections on batters they are all tight. No improvement.
My thoughts are replacing all the fuel lines and cleaning the tank?
Also the electrical safety stuff on this mower has been bypassed it has to be jumped at starter to start but it fires right up. Just loses power under load when “bouncing” around mowing. It never dies just stumbles and stutters. It is super annoying.
All help appreciated.
Paul
I replaced the fuel pump and it didn’t change a thing. I also cleaned the fuse block, replaced fuses and checked connections on batters they are all tight. No improvement.
My thoughts are replacing all the fuel lines and cleaning the tank?
Also the electrical safety stuff on this mower has been bypassed it has to be jumped at starter to start but it fires right up. Just loses power under load when “bouncing” around mowing. It never dies just stumbles and stutters. It is super annoying.
All help appreciated.
Paul