[AT] Update AT] 3 cyl diesel problems & fuel filters

[szabelski at wildblue.net]

I would imagine that the 10 micron filter is actually serving as a pre-filter, acting to catch the big stuff and allow the 5 micron screens to last longer before needing service. Also if you were to put in a 5 micron filter in place of the 10 micron filter, you may see enough pressure drop in the fuel line to affect how the engine runs once it starts to catch the 5 micron particles (in line restrictor???).

If you allow the 5 micron stuff to pass thru the 10 micron filter, then it essentially get distributed evenly across each injector screen and it takes longer to start plugging each of the screens, versus catching it all in an in line 5 micron in line filter which would plug faster.

This of course would be dependent on the surface area of any filter or screen in the fuel system.


I know wood workers who complained that the dust bag in their dust collecting system was passing 5 micron dust  that would eventually wind up on surfaces. They would spend big bucks putting in a hepa filter bag, and then complained that their filter system wasn’t sucking up dust like it used to, air flow restriction due to finer filtering properties of the bag. 

Carl

----- Original Message -----
From: Cecil Bearden <crbearden at copper.net>
To: at at lists.antique-tractor.com
Sent: Mon, 25 Nov 2019 08:30:31 -0500 (EST)
Subject: Re: [AT] Update AT] 3 cyl diesel problems & fuel filters

On the subject of filters.  My 2000 Ford F-150 4wd gase 5.7liter was my 
first and last drug confiscation truck.  It had sat outside the Stephens 
County jail and it appeared that someone had dumped sand in the gas 
tank.  It also had never had the oil changed for 8 years while the 
county abused it, a story for another time.  The injectors kept plugging 
up with a very fine stuff like rust.  I changed the fuel filter several 
times and found nothing in it.  I put 3 sets of injectors in it before 
ordering a fuel  tank from Amazon and when I changed it I found a pound 
of sand in the tank. It was taking the rust off the inside of the tank 
and plugging the injectors.  The filter is a 10 micron filter, but the 
injectors are 2 micron with a 5 micron screen in the injector 
connection.....   Why put a final fuel filter in a system that allows 
particles 5 times larger than the part you are trying to protect???
Cecil

On 11/25/2019 7:00 AM, Carl Gogol wrote:
>
> James.
>
> Kubota engines with 2 fuel filters are not pervasive but also not 
> rare.  I have a 23 HP Kubota front mower with two filters. One is 
> close to the injector pump and there is also one not so obvious closer 
> to the fuel tank. Eventually the not so obvious one plugs and much 
> more than one hair must be pulled from the head.  I personally didn’t 
> pull enough hair and thought I needed to call Kubota mobile service 
> which showed up with two different filters.  One more lesson learned.
>
> Carl Gogol
>
> Manlius NY
>
> *From:* AT <at-bounces at lists.antique-tractor.com> *On Behalf Of *James 
> Peck
> *Sent:* Sunday, November 24, 2019 8:11 PM
> *To:* 'at at lists.antique-tractor.com' <at at lists.antique-tractor.com>
> *Subject:* Re: [AT] Update AT] 3 cyl diesel problems
>
> You are saying this skid steer loader with Kubota engine has two fuel 
> filters
>
> Ivan AT List Member <ivancou at atlanticbb.net 
> <mailto:ivancou at atlanticbb.net> No , I was told its a kubota in  a 
> bobcat excavator .   I helped change the filter on the rear of the 
> frame by the access door but evidently theres a second one .
>
> James AT List Member and advocate of upgradeable tractor vocational 
> training <jamesgpeck at hotmail.com;  This is on a Yanmar engine?
>
> Ivan AT List Member <ivancou at atlanticbb.net 
> <mailto:ivancou at atlanticbb.net> ; They got the excavator  running 
> again , tracing the problem back to inline  screen in the fuel  system 
> . They rigged  a auxiliary tank and it ran well so they loaded  it 
> onto their trailer and took it back to the shop . Now that its  inside 
> time to tear it apart and remove the tank and lines to clean  them out 
> .     Just prior to this happening  Mathew had bought an old  fuel 
> tank off a neighbor and set it outside the shop , previously they  had 
> been using plastic cans . Ivan
>
>
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