No Fuel Supply to my 2-stroke glow engine

by Stephen Zinck
(Mahone Bay, Nova Scotia, Canada)

The 2-Stroke engine will start and run on the fuel used to prime. However, fuel is not being delivered from the tank to the engine.

Pressure is being supplied from the exhaust to the tank and all the fuel lines are free of holes and/or debris.

The high speed needle valve has been removed and cleaned. Trying to supply fuel to the engine via syringe does not work. Fuel is not getting into the carburetor? or maybe it is but not getting into the engine.

But, the priming fuel is getting into the engine. I am slightly confused since this seems to be a simple problem to diagnose.

Thanks,
Stephen

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No Fuel Supply to my 2-stroke glow engine

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Mar 08, 2009
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Great!
by: Matt

It's good to hear you got her straightened out!

Spring is almost here. Time to go fly!

Mar 08, 2009
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Thanks guys
by: Stephen

Finally got a chance to spend some hours fixing this. I checked the o-ring and it did seem as though the carb was not as tight in the engine as it needed to be. I also noted that the gasket around the exhaust manifold was cracked. Fixed that. Long and the short of it, I flooded it bad, but after I cleaned her out she starts and runs like a charm.

Jan 24, 2009
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Get'er going?
by: Matt

Hey,

Was just curious if you get your engine straightened out.

Hope so!

Matt

Jan 13, 2009
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O-Ring?
by: Matt

Hi Stephen,

I had a similar problem once, and found that the engine was sucking air between the carburetor and engine.

In my case, it was cracked as a result from a crash. I was able to finally seal it off with some RTV Sealant. Pretty ugly, but did the trick, lol.

You may want to make sure the O-ring between the carburetor and engine is in good shape. Make sure the carb is in place good and tight so air can not escape in between.

When it is running with the primer fuel, can you see the fuel moving in the fuel line right before the HS needle?

If it is not pulling fuel while running there must be an air leak some place. Could be the O-ring as I mentioned, or could be the high speed needle itself.

Put your finger over the carb and turn the propeller (ignitor not hooked up!). The engine should pull fuel through the fuel lines as you turn it over. If not, you've definitely got an air leak.

What kind and size of engine do you have?