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Old 08-26-2016, 07:53 PM   #1
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Fuel Lines

In relocating the fuel filter on the side of the engine to a better location, I found out something. My coach has two fuel filters one mounted on the frame rail that has a clear bottom on it and one on the side of the motor. The routing of the fuel lines are different than I was told my Monaco tech. The filter on the frame routes this way, the line from the fuel tank goes to this filter first (inlet) and the outlet goes to the lift pump. The filter is before the lift pump. Then coming from the lift pump the line goes to the filter that I moved. Then the line goes to the high pressure pump. I like this because the fuel is filtered before it get to the lift pump. I guess the lift pump has enough power to pull the fuel from the tank through the first filter then through the lift pump and then through the second filter and then to the main pump. The lift pump comes on for 30 seconds when you turn the key on to get fuel to the main pump and then cuts off. Most of you probably know all of this but it was new to me.
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Old 08-27-2016, 10:48 AM   #2
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The first filter the fuel should go through should be the one with the clear bottom and then go to the one on the side of the engine.
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Old 08-27-2016, 03:16 PM   #3
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That's right. The fuel goes to the filter with the clear bottom first, but my point was it goes to that filter before it goes to the lift pump. Everyone that I have talked to said that the fuel goes to the lift pump first and then to the filters. In my case it goes to the filter first and then to the lift pump and then to the second filter.
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Old 08-27-2016, 05:26 PM   #4
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The way yours works is the way I think mine works, otherwise the filter isn't protecting the filter.
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Old 08-27-2016, 06:35 PM   #5
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I called Monaco tech support and they said the lift pump should be before any filter. I call Cummins tech support and they said the lift pump is before the filter and should never be installed after the first filter. Well I'm a new owner of this coach and it is a 2004, but it runs fine the way it is set up. I don't know if it came from the factory Locke this or if someone along the way changed it over.
I'm going to leave it like it is because it make more sense to filter the fuel before it gets to the lift pump. You can change the filter much easier than you can remove the lift pump and clean it out. I do know that there is a filter in the lift pump that catches any thing from the tank if it is the first in the fuel route. In my case the filter catches it first.
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Old 08-27-2016, 06:56 PM   #6
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I have worked on thousands of diesel engines in trucks, machines and boats.

All, that I recall, if equiped with 2 filters, placed one before the lift pump.

Racor, a BIG name in filters, uses a vacuum gauge to monitor filter condition. You don't get a vacuum reading after the lift or transfer pump.

The first filter is usually a 30 micron or higher filter. The one after the lift pump, but before the injection pump, is usually 10 micron or less.
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Old 08-27-2016, 07:01 PM   #7
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You are correct with the setup. That's the way mine is.
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Old 08-27-2016, 07:04 PM   #8
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Thanks twin boat, that makes me feel much much better.
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Old 08-28-2016, 01:44 PM   #9
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I wouldn't worry about it. It will work
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