External Fuel Filter on a Duraforce

[Phototone]

Yes, it varies by state, here in Arkansas the gas pumps say "may" contain ethanol. The Pure Gas app, or the website tries to list every gas station that has at least one choice of non-ethanol fuel. For me, it is a Premium octane grade at a local Phillips 66 station. They label their pump to indicate the Premium is ethanol-free. Another nearby station sells a "pure gas" as one of their selections, which is regular grade but Ethanol free. For my use in my Lawnboy mowers and my 2-cycle weedeater and hedgetrimmer and chainsaw applications, I have never had gas "go bad" in a season. I regularly use up last seasons gas in the spring of each year in my equipment. I store gas in 2, and 5 gallon plastic fuel containers. I keep 5 gallons of straight gas, and decant into 2 gallon container with 2-cycle oil for use.

All LawnBoy mowers since at least the 1980's have had a filter screen in the gas tank, and another one in the carb. with 2 screens, I hardly think you need to add another external one.

 

[dewguy1999]

Some people choose to leave off the internal carb filter (over main jet nozzle inside float bowl), and add an inline filter, so that if anything gets by the in-tank filter the inline filter will catch it and that is easy to change.

Otherwise you would need to take off the whole carb to access the float bowl to clean the carb internal filter. So it can make servicing easier if you set up the filters this way.

Is it common for the high speed jet/nozzle filter to become clogged? I can see where having an external, easily replaceable fuel filter would be convenient, but, the only filters I could find online that specified the micron rating and were smaller than what's in the Lawn-Boy fuel tank were made by Briggs & Stratton and said they were for tractors with fuel pumps. Since I don't really know anything about this kind of stuff I would assume that these filters wouldn't work on a gravity fed system like on the Lawn-Boy, am I wrong in that assumption?

For my use in my Lawnboy mowers and my 2-cycle weedeater and hedgetrimmer and chainsaw applications, I have never had gas "go bad" in a season. I regularly use up last seasons gas in the spring of each year in my equipment. I store gas in 2, and 5 gallon plastic fuel containers. I keep 5 gallons of straight gas, and decant into 2 gallon container with 2-cycle oil for use.

I will probably do this next spring, but, since I'm still using the fuel from this spring and we've only got a couple of months left I think I'll continue with the BP gas (which I assume has 10% Ethanol) to finish out the season.

 

[qd-16]

I experienced my first problem with ethanol last summer. I had problems with some mixed gas I was using in two of my lawnboys.....fuel had been mixed well over a month

in a plastic fuel container. Both mowers ran as if their carbs. were out of adjustment and would stall and difficult to restart, after mixing fresh fuel the problem with both

LB's disappeared. I now use a product called "Startron" mixed in my small engine fuel that removes ethanol.....works great for me!

 

[Phototone]

I experienced my first problem with ethanol last summer. I had problems with some mixed gas I was using in two of my lawnboys.....fuel had been mixed well over a month

in a plastic fuel container. Both mowers ran as if their carbs. were out of adjustment and would stall and difficult to restart, after mixing fresh fuel the problem with both

LB's disappeared. I now use a product called "Startron" mixed in my small engine fuel that removes ethanol.....works great for me!

Wouldn't it be better (and cheaper) to just source gas without ethanol, rather than treat ethanol "enhanced" fuel? The Pure Gas website, or app for iPhone makes it easy to find a station. I think it would be foolish to remove the filter in the carb of lawnboy mowers. Take it off, to clean it, YES, but leave it off? NO!

Also, in regards the addition of a fuel shut-off. If the needle and seat and float of a Duraforce (or any Lawnboy) carb are good, there is no need for an external fuel shut off. There won't be any seepage. Why add a part to compensate for a carb issue that should be fixed?

 

[Mystik2stroke]

Is it common for the high speed jet/nozzle filter to become clogged? I can see where having an external, easily replaceable fuel filter would be convenient, but, the only filters I could find online that specified the micron rating and were smaller than what's in the Lawn-Boy fuel tank were made by Briggs & Stratton and said they were for tractors with fuel pumps. Since I don't really know anything about this kind of stuff I would assume that these filters wouldn't work on a gravity fed system like on the Lawn-Boy, am I wrong in that assumption?



I will probably do this next spring, but, since I'm still using the fuel from this spring and we've only got a couple of months left I think I'll continue with the BP gas (which I assume has 10% Ethanol) to finish out the season.

For gravity LB fuel system you need to use the RED briggs "pancake" style filter(150 microns), (not the semi-clear white ones, or any that have a paper element. Those type are too restrictive for a gravity feed system).

Also the 90 degree briggs plastic inline fuel shutoff is a must to avoid flooded crankcase from a leaky carb needle valve, this should have been done at lawn boy.

 

[dewguy1999]

For gravity LB fuel system you need to use the RED briggs "pancake" style filter(150 microns), (not the semi-clear white ones, or any that have a paper element. Those type are too restrictive for a gravity feed system).

Also the 90 degree briggs plastic inline fuel shutoff is a must to avoid flooded crankcase from a leaky carb needle valve, this should have been done at lawn boy.

Since the Briggs & Stratton Fuel Filter 298090S (5018K) is 150 micron and the fuel tank already has a "finer" non-replaceable 75 micron filter built in how would the Briggs being used as an external do any good?

Last week I installed a new CDI as well as a new fuel hose and 90 degree shut-off valve.

 

[Mystik2stroke]

Since the Briggs & Stratton Fuel Filter 298090S (5018K) is 150 micron and the fuel tank already has a "finer" non-replaceable 75 micron filter built in how would the Briggs being used as an external do any good?

Last week I installed a new CDI as well as a new fuel hose and 90 degree shut-off valve.

Hi-

The external filter acts as a backup to the in-tank filter, in case that filter was to break or come loose, you have the back up external filter, and it doesn't restrict normal fuel flow. You can remove the fuel tank with the fuel line and back flush to clean both filters as needed.

 

[LB8210]

I use both the filter and shut off valve on both of my 10525 mowers. And have not had any issues since they were installed. No carb flooding and no plugged jets.