bsamot69
Well-Known Member
Today, I began looking into our cat 420f no start problem. I was told the fuel was contaminated with sludge in tank. Drained and dropped the tank. The diesel looked okay and the tank was clean, not much build of crap. I removed the sending unit. The unit was covered in rust but was not clogged. I'm not real familiar with this machine. I understand it is self priming when key is turned on. Key on and there is no action in fuel system. The filter canister remains empty, don't hear any pump running. The person that brought the machine in said he was able to load on trailer by filling filter canister with fuel. The machine ran long enough to get it on trailer. I checked the fuses, they were all good. How do I check for fuel pump operation? Power supply, location other things I should be looking at? Thank you in advance for any help!