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Originally Posted by gene
Is the injectors leaking a possible cause and/or weak plugs? I was told there is a pressure valve of some kind at the fuel pump any confirm, as the fuel pressure drops (on gauge) after shut down.
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There is a thing called the "pulser" attached to the fuel pump in tank plumbing. That part, as I understand it, is supposed to prevent fuel from leaking back to the tank thru the feed line after shut down. But LT5's usually take more time to crank & fire up than conventional sb's. Mostly it's the ingnition system orienting itself before firing a spark.
The smoke could very well be injectors that are sticking open, as everyone has said. The other thing white smoke could mean is coolant leaking into the combustion chambers...I hope that isn't the case.
You could do a fuel pressure leak down test @ the fuel rail fitting and see what's up with the leak down rate. Or you might just run her and shut down, let it cool to stone cold and pull all the plugs and look for fuel.
Tom
Sorry, I forgot this. You did a leak down test and the results showed that the pulser is not working correctly! DUH on me! Mine isn't working right either. My work arround is when I crank, I turn the key to "on" and wait till the pumps stop and then go thru to "start". Maybe there are two issues: leaking injectors and a bad pulser?