Re: Won’t start after changing fuel filters Reply #75 – December 27, 2023, 11:50:50 am Quote from: John44 – December 27, 2023, 11:33:35 amAnother reason for using fuel additives.I agree, which is why I have always used a fuel additive (Diesel Kleen) with every fill up.I get that air in the system could cause problems, and as I said I plan on looking into the lift pump and fuel lines as a preventative measure for the future. At the same time I am not convinced that it is the reason for our fuel pump failure. I never saw any indication of fuel leaking before the fuel pump failed, and Cummins also checked the system and didn't find any indication of fuel leakage. Maybe I'm missing something, but it seems like if there is a leak that allows air in there should be fuel leaking out. Also, if any significant amount of air is entering the system, the engine performance should be affected. I would expect it to run rough and/or lose power. Ours ran as smooth as any diesel engine I have ever been around up until thirty seconds before it died. What am I missing? Quote Selected
Re: Won’t start after changing fuel filters Reply #76 – December 27, 2023, 12:13:27 pm Getting air into the fuel will not necessary have any fuel leaks. The Fass Fuel System takes the air outof the fuel and gives the fuel pump positive pressure. Quote Selected 2 Likes
Re: Won’t start after changing fuel filters Reply #77 – December 27, 2023, 12:16:19 pm Quote from: oldguy – December 27, 2023, 12:13:27 pmGetting air into the fuel will not necessary have any fuel leaks. Yup. Leaks on the suction side can suck air in, but not leak fuel out. OR they can also leak fuel out if below the level of fuel in the fuel tank, but only with the engine off. Quote Selected
Re: Won’t start after changing fuel filters Reply #78 – December 28, 2023, 11:38:30 am I had this situation, not long ago. The rear of the coach was higher than the front. I used a rag and my compressor to pressurize the fuel tank and pumped the primer bulb at the same time.(takes 2 folks)After about 30 seconds, the primer filled and I started the coach.Cheers! Quote Selected
Re: Won’t start after changing fuel filters Reply #79 – December 30, 2023, 01:37:53 pm I remember a similar problem with a 24 valve Dodge pickup with the new injector pump that replaced the trusty P7100 pump. The new inj pumps depend on diesel fuel forlubrication, a failing lift pump kills them in short order. The older injector pumps were lubricated by engine oil. An Airdog lift pump/filter system fixed it after replacing injector pump, never another problem. Quote Selected 1 Likes
Re: Won’t start after changing fuel filters Reply #80 – January 06, 2024, 08:48:50 am Quote from: Chuck Pearson – December 30, 2023, 01:37:53 pmI remember a similar problem with a 24 valve Dodge pickup with the new injector pump that replaced the trusty P7100 pump. The new inj pumps depend on diesel fuel forlubrication, a failing lift pump kills them in short order. The older injector pumps were lubricated by engine oil. An Airdog lift pump/filter system fixed it after replacing injector pump, never another problem.[/i]I had the same issue with my 99 Dodge with a 5.9 cummins and Bosch rotary VP44 injector pump.Installed a FASS supply pump and a fuel pressure indicator light on the dash to show if fuel supply pressure drops below 10psi. Quote Selected
Topic: Won’t start after changing fuel filters