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Discussion Topic:
Vapor Lock
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V8JR |
12-20-2014 @ 6:41 PM
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Member
Posts: 95
Joined: Mar 2012
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What suggestions is there for eliminating/minimizing vapor lock? Thanks for any thoughts - V8JR
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David J |
12-20-2014 @ 6:59 PM
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New Member
Posts: 136
Joined: Jan 2014
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Running nonoxy gas helps . All that's needed with my cars .
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Drbrown |
12-20-2014 @ 8:33 PM
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Senior
Posts: 571
Joined: Nov 2013
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Electric fuel pump at tank.
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trjford8 |
12-21-2014 @ 8:24 AM
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Senior
Posts: 4220
Joined: Oct 2009
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Are you sure you have vapor lock? Many times a bad coil or other ignition problems can give similar symptoms.
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DD931 |
12-21-2014 @ 1:38 PM
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Member
Posts: 66
Joined: Nov 2014
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I'll bet that at least 80% of "vapor lock" problems are actually bad coils!!
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David J |
12-21-2014 @ 2:01 PM
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New Member
Posts: 136
Joined: Jan 2014
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It is not hard to tell the difference between no or weak spark and lack of fuel . I personally use champion UD16 plugs because they have a hollow center and you can see spark in there as the motor runs . Really handy to diagnose most ignition or miss issues by simply looking into the plugs . If you have distributor or wire issues it shows up real well . Yes coils & condensers can cause symptoms similar to vapor lock but again it is real easy to tell if it is spark or fuel supply issues . AND the person asking the question asked about " vapor lock " NOT ignition problems . As I posted before simply using non-oxy gas is all I do and I have no vapor lock issues . This is stock 33-34 cars only and yes the ignition stuff is in good order .
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TomO |
12-22-2014 @ 7:14 AM
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Senior
Posts: 7256
Joined: Oct 2009
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David J, It is not necessary to get testy, because someone tried to give V8JR another item to look at besides your answer. V8JR did ask for for any thoughts and TRJFord8 gave him a valid answer to his question.
Tom
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David J |
12-22-2014 @ 9:04 AM
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New Member
Posts: 136
Joined: Jan 2014
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Testy ? The intent was-is to point out that checking if the " vapor lock " issue is fuel or ignition is REAL simple and takes about 5 seconds to verify strength of spark at all 8 cyls . That is if you are using UD16 plugs . BTW they cost no more than regular plugs [ well last time I bought a few boxes anyway ] and really work well for checking spark at all 8 cylinders . Now that is useful info and gets you on the right track in seconds . Non oxy gas cures all else for me anyway . David J
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JM |
12-22-2014 @ 9:59 AM
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Senior
Posts: 823
Joined: Oct 2009
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On our 2013 cross country tour to the GNM in Lake Tahoe, the majority of our cars experienced Vapor lock quite frequently on the 90°+ days, at the higher elevations, using the 10% alcohol enriched gasoline. We had about 20 Flathead powered cars from '32 to '53 on this tour. I knew the VL problem with my '35 fordor was not caused by ignition issues. I could see the alcohol in the gas boiling/bubbling in the glass bowl of the fuel pump. This caused a pressure buildup in the line that the fuel pump could no overcome. I carried ice water in the cooler strapped to my luggage rack, and whenever VL occured I would place an ice water soaked towel on the fuel pump for a few minutes. After this, the engine would start as soon as fresh gas was pumped into the carburetor. This worked every time. Those who had backup inline electric fuel pumps would just flip them on for a few seconds, and then be on their way.
John
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6lucky13 |
12-22-2014 @ 1:53 PM
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Member
Posts: 57
Joined: Jun 2011
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There is an advertisement in the V8 Times for a fuel hose with a built-in check valve. This would seem to prevent draining of gas from the carburetor. This may be an easy fix compared to installing an electric fuel pump to prevent carburetor drain. Has anyone tried this approach? Would appreciate thoughts. Jon
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