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Old 11-17-2014, 01:48 PM   #1
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Had Air In Fuel Line, how does that happen?

engine would not start. had air in fuel line.. didn't change any filters. how does that happen
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Old 11-17-2014, 02:24 PM   #2
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Typically a little bit of debris gets into a check valve and lets the fuel drain back to the tank. It could be a one time thing or could indicate a bigger issue developing.

What is this on?
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Old 11-18-2014, 10:07 AM   #3
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I have cimmins 5.9 ISB engine in my Winnebago suncruser. it's on a freightliner chassis. what is the bigger issue how do I head it off?
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Old 11-18-2014, 10:11 PM   #4
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I have cimmins 5.9 ISB engine in my Winnebago suncruser. it's on a freightliner chassis. what is the bigger issue how do I head it off?
The 5.9 uses 2 rubber flex lines between the lift pump and steel lines to absorb vibration. These lines appear fine outside, inside the lining fails and partially collapses. This causes the lift pump to pull a slight vacuum on those lines, and since there is no fuel pump in the tank it can pull air through the outer casing of those rubber lines.
That's what happened on my 5.9 in a Dodge pickup.
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Old 11-26-2014, 03:52 PM   #5
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The 5.9 uses 2 rubber flex lines between the lift pump and steel lines to absorb vibration. These lines appear fine outside, inside the lining fails and partially collapses. This causes the lift pump to pull a slight vacuum on those lines, and since there is no fuel pump in the tank it can pull air through the outer casing of those rubber lines.
That's what happened on my 5.9 in a Dodge pickup.

(I also have this)Can U add a fuel pump? suggestion of model?
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Old 11-26-2014, 04:31 PM   #6
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I would replace the fuel filters. I had a problem with my diesel pump. It would not start and I bled the fuel lines and got it started then it ran for a while then would not start again. I had replaced the fuel pump and did not realize it did not have the O ring with it. Once I replaced that it ran fine. I realize you probably do not have that problem but a gasked on the fuel filter that is leaking could give the same indication. It is also an easy thing to try.
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Old 11-26-2014, 09:47 PM   #7
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Yes mff, an aftermarket fuel pump can be added, as close to the tank as possible preferably, because an electric fuel pump is better at pushing fuel than suctioning fuel. IMO, the best on the market is the FASS fuel system. Less expensive brands are available though.
You'll need to know the fuel demand GPM for your engine at WOT in order to purchase the correct pump, whatever brand you buy.
Keep in mind any aftermarket fuel pump will not compensate for faulty fuel lines.
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Old 11-27-2014, 06:52 AM   #8
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If it happens while on the road, it could be vapor lock.
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Old 11-27-2014, 04:05 PM   #9
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Depending on the age it could very well be the rubber supply lines leaking, not fuel but allowing air to suck in through the sides of the hose.

So far as I'm aware of this isn't a common problem with the Cummins engines, does it do it every morning or was it a one time thing?
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Old 11-27-2014, 07:23 PM   #10
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On a recent trip I noticed the indicator light "Water in Fuel Filter", pulled into a rest stop, bled out some water into a empty water bottle. The eng started then stopped, I checked the fuel filters and were empty. I filled then started the eng and stopped again. Pulled the fuel pump and found it in perfect condition. I noticed that I was parked on a downward slope of about 10-20 degrees and also, the fuel tank was 1/2 full. When I bled the fuel filter, The fuel automatically flowed forward to the tank, NOW there is air in the fuel line. (Because of the location I was not able to coast to a level area) I started the portable air compressor, filled the fuel filters, fabricated a rubber grommet to fit the fuel tank opening with a small hole for the air nozzle. NOW,,,, I'm holding air nozzle to the tank, and the Mrs is cranking the eng. YES!!!!!! It started. I'll NEVER bled the fuel filter on a downward/forward hill. 7hrs time start to finish.
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