YS 140L not starting

[Mike East]

Check valve in backwards by chance?
Fuel filter plugged? 
Might have a pressure regulator sticking. My engine will sometimes be tough to start after it has set a while (3-4 days).
Changing out the diaphram, plunger and valve seat may be a cheap easy thing for you to do and eliminate the possibility of fuel pump problems.  I ordered several sets of spare pump parts from Central, they are only about $6 for plunger, valve seat, diaphram, and gasket. But you did say it just came back from YS, maybe something is just sticking preventing the engine from getting fuel.
 In my similar situation, theYS gurus I fly with had me open the throttle up wide open and turn the engine over with the starter for about 10 seconds and then try to start the engine. Even then sometimes it might take 30+ seconds on the starter before the pressure regulator would pickup and it would hit. If I fly daily it starts right up. 
I think that what is most likely going on with mine is something in the fuel pump is sticking if it sets up. Mine is running fine as long as I continue to fly everyday, but I have the parts on hand now if it quits again on me. 
 This may be old news to ya, maybe it will be useful. 

Peter Pennisi <pentagon.systems at bigpond.com> wrote:

It’s not getting any fuel. 

 

Try blowing into the fuel line that goes to the high speed needle assembly. You should be able to blow through it. Make sure needle is 1 ¾ to 2 turns out. 

 

 

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From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Prmoore at aol.com
Sent: Saturday, 5 June 2004 2:19 PM
To: discussion at nsrca.org
Subject: YS 140L not starting


 

Engine doesn't want to fire. Symptoms: 

Fuel draw not the best, very little pressure in the tank, compression seems OK.  When we first pulled the cowl the fuel was to the filter which was the high spot in the line, after some fidgeting (not sure why) the fuel line had visible fuel to the engine.  


Removed the glow plug, put a few drops of fuel in the cylinder still basically wouldn't fire.  There we a couple of very minor puts while turning with the starter after putting the fuel drops in the cylinder.  Pulled valve cover, valve gap not the problem.  Glow plug glows, check valve is in the correct direction.  If you put your finger over the pipe exhaust can't feel any pressure pulses as we turned the engine over.  This engine hasn't been run since comming back from YS (supposedly rebuilt).


 


Phil



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