I have an 1986 580k backhoe with a none turbo cummins. the problem is when the hoe sits for a while not running it wont start unless you give it full throttle, like the fuel pressure has bled down.But if it only sits for a little while it will start as normal. I need to fix the problem because cold starts are hard on the engine having to start it full throttle! I see no leaks on fuel system. Could it be a solenoid? Thanks for any help Jazz.......