Cat 941 sn80h2530 which is leaking fuel at the vent hose. Machine runs fine just pouring fuel (approx pint a minute) out vent hose. Problem started after changing filters. Have changed out the vent control knob. Tried adding a shutoff on the vent hose which caused the fuel to leak between the transfer pump and hour meter that attaches back of pump. The fuel system does not have fuel return line back to tank therefore confused how system works for over pressure. Also has no check valve only output is fuel pressure meter. Trying to understand where check valve are located in this design. My first heavy equipment so having to rely on service manual which is vague in this area. Any help would be appreciated
↧