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Old 03-07-2020, 02:55 PM   #1
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Low fuel pressure light blinking

Hi I am pretty much a newbe I've had this 2000 Class A DP for about a year and put about 3700 trouble free miles on it. My wife and I were planning on taking a 50 mile cruise after it has been sitting for about 2 months. I turned the key and the fuel pressure light started blinking and didn't go out even after running about 15 minutes. Well I thought that was it and was gonna cancel but i wanted to move it over and I did no problems. Shut it off and tuned the key back on and it started immediately no blinking light. Figuring it was a glitch I hit the road. At 25 miles pulled into a stop everything good. Let it idle and after about 15 minutes light starts blinking, running great. I shut off and start back up runs great no light . Drove home no light everything great. Get home and let idle and after about 15 mins blinking light. Does any one out there have a clue about what could be causing this? We're planning a 2000 mile trip.
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Old 03-07-2020, 03:01 PM   #2
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fuel filters??
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Old 03-07-2020, 04:05 PM   #3
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I'm guessing, but I believe your 2000 ISB uses the VP44 injection pump along with an electric lift pump. The low fuel pressure message could be from clogged filters, as mentioned, a failing lift pump, or a fault in the VP44 high pressure pump itself. If replacing the filter does not remedy all symptoms, I would advise having it diagnosed by a competent shop familiar with your system. I would not risk any lengthy travel not knowing the source of the fault.
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Old 03-07-2020, 04:38 PM   #4
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On top of filter housing, mine has 2 1/8" pipe plugs....one is for fuel entering filter and the other is for flow from filter to the VP44.....that's where my Pressure gauge attaches.....and can be checked with a manual gauge.....when lift pump fails, due to the VP44 having a small pump in it, the engine will run.....but it's starving for fuel and that'll kill it.....Blue Chip Diesel has excellent info on their website........got 150,000 miles out of factory pump
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Old 03-07-2020, 04:40 PM   #5
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Do you think my failure to drain the fuel water separator could cause this?
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Old 03-07-2020, 04:53 PM   #6
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Have you drained it?......see any water?......I've never had water in mine.....always using ....250,000 on it now
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Old 03-08-2020, 09:46 PM   #7
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I'm not sure this applicable on a V44 pump, because I have an ISC-CAPS engine, but I would think a better option to throwing ANY money at a stock lift pump replacement is... to bypass the lift pump, and go with a 12V-FASS adjustable pump; and/or if you have room, you want better filtration, then you can install a FASS-TS pump or AirDog-II-4G near your fuel tank or in the engine compartment.

What does your lift pump look like? Is it like this on I have on my ISC?
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Name:	FASS Adjustable 95 GPH Lift Pump (No Filters).jpg
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Name:	FASS Titanium 95 GPH Lift Pump Diagram 3.jpg
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