How : Diesel lines without lift pump ? - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 01-20-2015
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How : Diesel lines without lift pump ?

Alright. This is working, but I still wonder how.
my diesel lines are higher than the engine and the tank, and even than the secondary filter.
See attached picture.

Now, When I change the racor filter, I introduce air in those tubes, before and after the filter, I understand that.
I have a manual lift pump that I use for around 1 minute, without noticing anything. I bleed my engine at 3 points, but do not really see any air bubbles, it is pretty much fuel.

And it works. This is a Westerbeke 40.

How does the fuel circulate through the lines to the fuel pump without a lift pump ? that's a mystery to me.
Anyone cares to explain ?
Appreciated.
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How : Diesel lines without lift pump ?-fuel.jpg  
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Old 01-20-2015
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Re: How : Diesel lines without lift pump ?

Magic, man.

Don't ask questions that you won't understand the answers to... Haha, (:

- Ronnie...on the geaux
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Old 01-20-2015
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Re: How : Diesel lines without lift pump ?

If the engine injector pump is lower than the top of the fuel then it will act like a siphon, possibly there is some "draw" from the injector pump also ,but I don't know
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Re: How : Diesel lines without lift pump ?

Quote:
Originally Posted by deniseO30 View Post
If the engine injector pump is lower than the top of the fuel
That's definitively the case.
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Re: How : Diesel lines without lift pump ?

My system is the same. I run a pressurised system with an electrical fuel pump. What's the model of that Racor filter you are using? Mine is getting a bit tired.
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Re: How : Diesel lines without lift pump ?

Racor 2010TM - OR.

Last time I bleed the lines by installing a small electric pump. Now, it seems overkill.
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Old 01-20-2015
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Re: How : Diesel lines without lift pump ?

Strongly recommend a basic diesel course to the OP and all who have responded to him. Many community colleges have them.
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Old 01-21-2015
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Re: How : Diesel lines without lift pump ?

Yanmar 4JH, no lift pump. None. Nada. Zilch.

While I have since changed things about, adding a day tank for other reasons, the engine ran fine when drawing from the bottom of a tank at least 5-feet BELOW the Racor.

Just saying.
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Re: How : Diesel lines without lift pump ?

Quote:
Originally Posted by hpeer View Post
Yanmar 4JH, no lift pump. None. Nada. Zilch.

While I have since changed things about, adding a day tank for other reasons, the engine ran fine when drawing from the bottom of a tank at least 5-feet BELOW the Racor.

Just saying.
Same here with a Yanmar 4JH3-HTE. That said, I am adding an electric in-line pump to facilitate system bleeding when I change filters and also so I can polish my own fuel without running the engine.
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Re: How : Diesel lines without lift pump ?

Quote:
Originally Posted by boatpoker View Post
Strongly recommend a basic diesel course to the OP and all who have responded to him. Many community colleges have them.
This is helpful. Do you mind to elaborate ?
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