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  #1  
Old 06-01-2004, 04:31 PM
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Question about fuel bleeding...

I'm a newbie to the diesel Benz world and just installed new fuel filters yesterday. Then I bled the fuel system using the hand pump on the engine. I'm not sure I did this right.

I loosened the nut atop the spin-on fuel filter and pumped until the bubbles seemed to stop coming out below the nut. But I kept seeing air in the clear fuel line that runs from the IP to the spin-on filter. Also, the hand pump was making a whistling or squeeking sound that led me to believe maybe the hand pump is bad. There was also an air bubble that I couldn't get out of the clamp-on prefilter.

Is all of this normal, or did I do something wrong?

Thx in advance everybody!

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Old 06-01-2004, 04:39 PM
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Did your engine start and run ?
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Old 06-01-2004, 05:04 PM
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The air bubble in the prefilter is normal, and as I understand it, squeaking in the hand pump is a sign that you've got things pressurized and are moving fluid.

If it runs, then you're good to go!
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Old 06-01-2004, 05:10 PM
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With a return fuel line a little air in the lines really isn't a problem. I just replumbed my system and added a switch valve for running on WVO. Didn't bleed anything despite having a little air in the diesel line. I then added oil to my 2nd tank.. and literally sucked the oil from the trunk and filled my Racor filter without bleeding. That said I only had the oil tank switched on for about 20 second intervals till I had cleared the air from the lines. The engine didn't sputter at all.
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Old 06-01-2004, 05:30 PM
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Yes! She started and ran fine after the filter swap and bleeding. So it sounds like I'm good to go...?
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Old 06-01-2004, 07:20 PM
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Yes, no matter what you did..... if it starts and runs all is well.

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