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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...

Are you refering to the fuel inlet hose? by "filter off" are you saying not to install an in-line filter?

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...

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...