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Old 03-16-2009, 12:32 PM
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Vapor lock question

What would cause vapor lock and how can I prevent it? Engine is a 383 Chevy, with a 750 Holey. It seems to happen on hot days. When it happens the engine is at normal operating temperature.

thanks
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Old 03-16-2009, 12:59 PM
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Running the fuel lines close to hot areas, like headers etc. will cause vapor lock. If you can't route them differently, shielding or insulating them helps.
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Old 03-16-2009, 01:26 PM
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vapor lock

i have the fuel lines are insulated.
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Old 03-16-2009, 01:31 PM
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vapor lock

Use cclothe pins on your fuel line ,works like majic.
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Old 03-16-2009, 01:38 PM
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vapor lock

Ya know I have heard the before. Did that actually solve a problem you had or is it just something you heard?
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Old 03-16-2009, 02:17 PM
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Quote:
Originally Posted by 40forddgc
What would cause vapor lock and how can I prevent it? Engine is a 383 Chevy, with a 750 Holey. It seems to happen on hot days. When it happens the engine is at normal operating temperature.

thanks
First off more information would help like what is the engine in.
How do you know it is vapor lock, vapor lock is not a real common issue anymore.
What are the symptoms and what do you do to fix it.
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Old 03-16-2009, 02:24 PM
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Gas formulations vary with the seasons and geographical location.

If you last fueled up and it was the middle of winter, the problem might resolve itself with a fresh refuel. Same thing if the car came from a cold climate to a warm one.

Never heard what the deal is w/the cloth pin trick, but heard that forever. Maybe it creates a mini-heat sink? (Unlikely w/a wood pin...) Dunno.
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Old 03-16-2009, 02:33 PM
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vapor lock

The engine is in a 1940 Ford street rod. The last time it happened is when I exited the freeway and when I took off from the stoplight the car crapped out and after a few seconds it was OK.
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Old 03-16-2009, 02:38 PM
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Makes me wonder, because usually a v-lock doesn't resolve that way, nor present that way, either. Often, it's a no-start condition after hot soak...
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Old 03-16-2009, 02:42 PM
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vapor lock

That's what I would think also. if you have any suggestions let me know.
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Old 03-16-2009, 02:52 PM
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See if you can recreate the problem, it might just be transient- i.e. "one of those things".

You could look to the filter (unlikely) or possibly water in the fuel or dirt momentarily plugging an orifice in the carb.
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Old 03-16-2009, 02:56 PM
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vapor lock

I am going to check the filter. thanks
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Old 03-16-2009, 03:04 PM
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A new filter can't hurt.

If the car's been sitting unused for awhile, like if this is the first time in awhile that you've had it out, don't discount water being the culprit. Or if the fuel level is lower than normal.

The water can get stirred up when cornering and such (you mentioned exiting the freeway). Enough so, that it can be drawn into the fuel line/carb/engine.

Dry gas may help, but a better solution might be to drain the old gas and replace w/fresh.

Good luck.
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Old 03-16-2009, 03:08 PM
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I had the same problem on my truck. Either a long hard run or extended idling. Then take off, get into it some and it would crap out. Usually would finally take off but sometimes died completely.
After a long time of nursing it along and trying different things, I cked the pump pressure when hot and had 1 whole pound! LOL Changed the pump and not a problem since. Worth a check.

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Old 03-16-2009, 03:19 PM
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vapor lock

Certainly something that could be possible. Could the pump lose pressure when it get hot. When it craps out its always when the road conditions are hot.
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