1993 751 bobcat

[Ash]

After running for about 90 minutes, it slowly begins to lose power. I was in the woods and got it back to garage. A week later tried again and about 40 minutes later same thing. I have a 4 in 1 bucket and when turning and using bucket hydraulics at the same time really starts to lose power. Got it back in garage before it stalled. 50 hours ago ( 7 years ) needed a new pickup tube and fuel line replaced. I opened fuel filter drain and found no water but a little dirt, maybe from original pickup tube. Then pumped bulb and fuel poured out. Only about 1980 hours on it. The shop cannot duplicate problem. Any help would be appreciated. Thanks

 

[bobbie-g]

The Pug fuel injector pump has the lift pump built in. Try asking a brave assistant to pump the primer bulb by hand when the engine is faltering. If it goes back to normal, then it's the lift pump inside the injector, as it was with my Pug engine. You also might try running with the fuel cap loose or maybe even Molotov-cocktail style with only a rag stuffed in it fuel filler port to keep out the detritus. Let us know if this helps. ---Bobbie-G

 

[farmshop]

The Pug fuel injector pump has the lift pump built in. Try asking a brave assistant to pump the primer bulb by hand when the engine is faltering. If it goes back to normal, then it's the lift pump inside the injector, as it was with my Pug engine. You also might try running with the fuel cap loose or maybe even Molotov-cocktail style with only a rag stuffed in it fuel filler port to keep out the detritus. Let us know if this helps. ---Bobbie-G

I bought a small 12volt lift pump that I use to help diagnose fuel systems. I just put alligator clips on it