We have a '03 85ZV with a cummins QSL9 and 6700 hrs. Loader was operating fine untill 2 weeks ago. It wouldn't start. Fuel filter was dated 9/11. It was a balwin filter. We put a NAPA 3405 fuel filter on and loader started and ran 12 hrs plowing snow and fuel toped off. Next morning same thing. Pulled filter off and there was a inch of fuel in the bottom of the filter. Noticed the elec.fuel lift pump was dripping fuel on the bottom. We filled a nother 3405 NAPA filter and she started and ran for 4 hrs. I ordered a new pump and installed two days later. Pulled Napa filter and she had a inch of fuel in it. As it was new we filled it and the loader started. Ran it for a couple hrs. pushing up snow and shut her down till next morning. Went in at 4am and loader started hard (turned over alot till it started) and had no pedal responce and then it quit. Tried to start it again and nothing. Pulld filter and again only a inch of fuel in bottom. Filled anouther new 3405 NAPA fuel filter and put on and she took off and ran great for 3 or 4 hours. Two days later went in to plow and again no start. This time I turned key on and loosend large fuel line between filter housing and injector pump and got air then fuel. Tightend up line and she started right up. Plowed for 8hrs with no skips great power. New pump is pumping great but fuel keeps leaving filter over night and I have to loosen large fuel line to bleed out the air and fill the filter to start loader. I'm woundering if it's this NAPA filter. I don't know but this kinda s*it sucks. Anybody had this problem or simalar. Any input would be greatly appreciated!
sounds like you're sucking air somewhere, if that's not obvious already. or maybe more like fuel leaking back to the tank, but that means air is getting in to let it leak back. You could hook up some air pressure to the line and see where the air leaks. Either disconnect lines from the tank and use 10-20 psi, or plug the tank vent and use 5 or less psi. Drain the fuel from the lines first and then use soapy water in a spray bottle to find the bubbles. That's general diesel advice, not familiar with your machine.