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Post Info TOPIC: Vapor Lock?


COURTICE, ONT

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Vapor Lock?
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I've been trying to figure out a problem in the truck but haven't sorted it out yet. It seems like vapor lock. Starts AMAZING when cold. But turn the truck off hot and it'll start up again nice an easy within a minute or two of shutting off but let it sit for 5 minutes or more and it's a difficult start. I insulated the fuel line near the headers. I'm going to put more insulation on the other hard line running up from the fuel pump - havent done that yet. I changed the fuel pump just in case. If I open the hood right after shut off it seems to help with the problem a bit.  Someone suggested try and carb spacer/insulator and see if that helps...

Any thoughts/suggestions??



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MARKHAM, ONT

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Are you sure its fuel related?  Unusual for the carb to be dry in 5 minutes?  Sounds more like a coil getting near the end??



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COURTICE, ONT

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I'm not 100% sure. I had a feeling fuel related but I'm no expert... Lol

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Senior Member

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Does you're engine have an Egr valve?

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Ground Pounder wrote:

Does you're engine have an Egr valve?


 Might even be in- correct set points or a weak pick coil in the distributor



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MARKHAM, ONT

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I can try and walk you through some diag if you are game?  With the air cleaner lid removed, you should be able to look down the carb and see 2 strong jets of fuel when the throttle is opened by hand (with the engine off)  Try this when its cold so you know what to look for and try it again when it acts up.  Joust a hunch, look at the ignition coil.  If it is mounted on its side (not standing up) make sure the connections are at 9 and 3 oclock.  (they are filled with oil and if they are canted the windings overheat).  What kind of car are we dealing with and is it points or electronic ignition?  When it does finally start, does it kinda chug and seem lazy at first or come right to life?



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COURTICE, ONT

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Thanks for the input. I'm gonna try and confirm if it's vapor lock before I mess around with electronics. Some friends gave some methods to confirm if it is or not so I'll I've that a shot first and start there.

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MARKHAM, ONT

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Start there, good one!



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COURTICE, ONT

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Looks like it's pretty much sorted out.
I picked up the edelbrock 9266 insulator gasket. they specifically for the performer carbs to prevent fuel percolating.
Sounds like must be a common issue to me.

I installed the gasket and immediately I'd say it's 95% better.

 

Screen Shot 2016-08-31 at 2.15.41 PM.png



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