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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Saved a wad today
Date: Mon, 7 Jul 2025 16:28:11 -0400
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"Leon Fisk"  wrote in message news:104h2st$31mf7$1@dont-email.me...

Mine would stumble at times and catch again. Usually on HOT days and
after running the gas tank maybe to half or less (filled before
mowing). It has a Kohler Command 25hp 2-cyl on it with a Crankcase
Pulse Fuel Pump. Just put up with it for awhile but it kinda bugged me.
I ordered a cheap replacement pump and a new air filter on a hunch. The
Air Filter looked okay but had oil from the rocker cover (vapor
recovery) contaminating it. Replacing the Air Filter got rid of the
stumble, didn't need the new pump. Has been a couple years now and
hasn't happened since. The vapor recovery is a direct shot into the
intake, bypasses the Air Filter. Think it was sucking so hard on the
vapor recovery that it was messing up the amount of "pulse" available
for the fuel pump...
Leon Fisk

-----------------------------------------
Maybe the cause was the pressure drop through the clogged filter. The quick 
test would be running without it.

I picked up a couple of these second-hand to measure wood stove draft and 
heatsink pressure drop, an indication of air flow rate. This would be a good 
use for them.
https://www.dwyeromega.com/en-us/low-differential-pressure-gauge-no-power-needed-ip67/p/Series-2000-Magnehelic?