T&T: 2 10 30 Micron Filters??

[Bob Clinkenbeard]

Hmm..this sounds like a red flag for me.

When I bought my boat, the  Perkins M-30's (3 cyl 29hp) fuel system had been 
plumbed with an electric pump in the line that the PO said was required 
because the engines lift pump would not continually run the engine.  I 
noticed that the fuel return line was plumbed in to the Racor filter and 
assumed that that was the problem....backpressure.
After removing the electric pump and installing correct return lines 
directly to the tanks, I still have a problem with the engine starting and 
running without sounding like fuel starvation or air in the lines.  After a 
few starts, it levels out and seems to be fine as long as the idle is a 
little high.

After reading this....I am using a 2 micron filter in the new Racor and he 
was too.  The filter on the engine is 30mic.  I am going to try replacing 
the filter in the Racor and see if it corrects my problem.   Since I have no 
fuel leaks and all of my lines, valves, fuel tank pickup, filter and hoses 
are new...I think an air leak is not probable.

I even replaced the fuel lift pump to no avail....oh well, I have an extra 
now.
Fingers crossed,

Bob Clinkenbeard
24' custom trailer trawler
http://home.bellsouth.net/p/PWP-aboardbobbinalong


----- Original Message ----- 
From: "LA Licata" <lalicata at alum.rpi.edu>
To: "Phil de l'Etoile" <pdeli3 at gmail.com>
Cc: "TrawlerList TrawlerList" <trawlers-and-trawlering at lists.samurai.com>
Sent: Monday, December 31, 2007 4:59 AM
Subject: Re: T&T: 2 10 30 Micron Filters??


> Phil.
>
> How long have you had your engine?
>
> Have you had any fuel problems that otherwise might be explained by
> fuel starvation?
>
> If you can run at WOT at the correct rpm for a while without any
> problems, and you can run your "unloaded at the dock test" also
> without any problems, then while on theory, he may be right, I think
> you can be comfortable with the setup you have because it is working
> for you.
>
> The 30 vs 10 vs 2 micron argument has been hashed on this list many
> times. My personal opinion, mind you, very personal, is that if what
> I have is working for me, than there are plenty of other things not
> working that need my attention...
>
> Lee
>
>
>
> On Dec 31, 2007, at 08:58 , Phil de l'Etoile wrote:
> Last week when I had a Cummins mechanic on board trying to solve
> several problems, he was quite stern about the fact that I shouldn't
> be using 2 micronfilters... His reply was that the fuel lift pump
> doesn't handle the increased resistance well.   The lift pump pushes
> much, much, better than it pulls, and it is pulling on the primaries
> and pushing on the secondaries...
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