Bobcat S300 - Won't Start!!!!!!

mikeyTexas · Feb 9, 2026

Have a bobcat s300, let it run low on diesel and it sucked up some nasty looking trash. Now the filter is clogged with this sticky thick tar substance that the diesel will not move it or break it down. So I've replaced the fuel filter. The fuel looks a lot cleaner now, but the injection pump is receiving fuel but it 4 outlets at the top are not putting out. Does anybody know we in the pump would that bad fuel clogged up or where I could look. Also is there anything I can put in it to help it out? I'm thinking I'll have to remove the injection pump tear it apart and clean it and put it back together. God please have your inputs thank you

Picture #1 - is the fuel filter I pulled out showing all the sticky tar stuff on the outside of the can.

Picturre #2. - this is the fuel I pulled out of the fuel filter. And you can see the separation at the bottom.

mrbb · Feb 9, 2026

did you also drain the tank and clean it out, as if not, anything you do , might soon be back to square one with blockages

as its for sure your tank has a lot of debris in it,
just replacing filters cleaning pumps injectors/lines won't stop problem from coming right back

you need to go down stream and resolve gunk in tank first or you may just be wasting your time and $$$
many bobcats have drain plugs on there tanks for reasons like this

if not siphon out all you can and then get creative! or remove tank and clean it!
might not be what you want to hear, but its honest advice!

Bobcat S300 - Won't Start!!!!!!

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