40micron fuel filter on a 4hp lv148ea-334005b engine?

F

flyONWire

Forum Newbie
Hello,
I recently rebuilt carburator Tecumseh 640339 on a 4hp lv148ea-334005b with weed eater deck.
I was wondering if installing an in-line 40micron (filters particulates a bit smaller than the diameter of a human hair and larger) on top of the in-fuel tank screen filter would increase filtration efficiency and keep the fuel entering the carburator cleaner? When using 10% or lower blended ethanol fuel.

Filter #:

Prime Line 7-02357-1 40 micron 1/4" ID​


I got the idea off a YouTube video I saw of someone installing a 150 micron for a 15hp lawnmower.
 
40 micron could, be not guaranteed to cause flow restriction issues causing the tank to not completely empty. I was seeing some flow restriction issues on riders with gravity flow carbs on riders newer than 2012 when attempting to use 40 micron filters. Part of that issue is due to the emission controls systems causing a slight vacuum on the fuel tank.

And I don't use any filter with less than a 75 micron filtration. Had issues when using 150 micron filters on riders with allowing sand to enter the carb and prevent the float valve from sealing.
 
ILENGINE said:
40 micron could, be not guaranteed to cause flow restriction issues causing the tank to not completely empty. I was seeing some flow restriction issues on riders with gravity flow carbs on riders newer than 2012 when attempting to use 40 micron filters. Part of that issue is due to the emission controls systems causing a slight vacuum on the fuel tank.

And I don't use any filter with less than a 75 micron filtration. Had issues when using 150 micron filters on riders with allowing sand to enter the carb and prevent the float valve from sealing.
Click to expand...
This is a 4hp small engine push mower with 148cc of displacement.
It didn't originally come with a filter, just a in-tank screen filter attached to the tank's outlet.

Just seen people installing filters on 7-15hp lawnmowers and figured if a smaller filter could be installed on a small engine to keep the engine cleaner.

there seems to be vacuum up from the carburator.
I see how a rider's fuel system like a John Deere sst15 could be affected by a finer filter as a secondary but for a small engine should it be okay and would it help at all?

Thanks.
 
You can try it. Worse thing that could happen is it dies from fuel starvation with half a tank of gas.
 
Scrubcadet10 said:
I would use a White briggs filter. 5098K
Click to expand...
I know they usually use 75 on tractor mowers without fuel pumps.
Given that a 148cc is 4hp engine is a small engine I don't think there's large enough particulates that require a 75+ filter.
The in-tank screen is already about 40 micron.
sometimes a bit of debris gets in the tank like sand and other mineral probably about 50 or more micron.
My concern was that if it's even worth it to install a in-line filter on one of the smaller engines. ty.

Scrubcadet10 said:
I would use a White briggs filter. 5098K
Click to expand...
 
flyONWire said:
I know they usually use 75 on tractor mowers without fuel pumps.
Given that a 148cc is 4hp engine is a small engine I don't think there's large enough particulates that require a 75+ filter.
The in-tank screen is already about 40 micron.
sometimes a bit of debris gets in the tank like sand and other mineral probably about 50 or more micron.
My concern was that if it's even worth it to install a in-line filter on one of the smaller engines. ty.
Click to expand...
Well, according to Briggs the Red Filters are for gravity feed and the white filters are for engines with pumps, however i've had no issues with using the white filters on gravity systems.
 
flyONWire said:
Are you refering to the fuel inlet hose?
by "filter off" are you saying not to install an in-line filter?
Click to expand...
I’m saying replace the line from the tank to the carburetor and leave the filter off. Most push mowers don’t have fuel filters.
 
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