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Discussion Topic:
Vapor Lock
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JM |
12-22-2014 @ 7:00 PM
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Senior
Posts: 822
Joined: Oct 2009
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That hose with a check valve will not prevent vapor lock
This message was edited by JM on 12-22-14 @ 7:04 PM
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6lucky13 |
12-25-2014 @ 8:51 AM
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Member
Posts: 57
Joined: Jun 2011
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Sorry...posted to the wrong thread.
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MICHV8 |
12-26-2014 @ 7:33 AM
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Member
Posts: 405
Joined: Jul 2010
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Having never had an electric fuel pump, would someone recommend a good one? And why install at the tank vs near the fuel pump? thanks
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TomO |
12-26-2014 @ 8:55 AM
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Senior
Posts: 7243
Joined: Oct 2009
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Traditional vapor lock occurred in the line from the fuel pump to the carburetor or in the sediment bowl for the fuel pump. The fuel would vaporize in the line or the bowl starving the engine for fuel. Early Ford V-8s are more likely to experience this as the fuel pump sits on top of the engine. If the fuel pump keeps enough pressure on the output side, it raises the boiling point of the fuel. The input to the fuel pump should get enough cool gas from the tank to prevent it from boiling. To minimize chances of vapor lock, make sure that there are no vacuum leaks to the input side of the fuel pump, make sure that the push rod is not worn and delivers a full 1/4" stroke measured at the operating arm of the fuel pump, make sure that the valves in the fuel pump are working properly and that the fuel pump delivers at least 2 1/2 lbs of pressure. If you have duals, make sure that the exhaust system is at least 2" away from the fuel line at the closest point. You may still have to wrap the exhaust pipe to keep the heat from the fuel line. These steps will help in most situations, but cannot ensure that you will not have the problem in higher elevations, especially if you fill up in the lower elevations. John's solution of the ice on the fuel pump is the best for occasional vapor lock. Electric fuel pumps are placed near the tank as they are better at pushing fuel than sucking fuel. If not installed correctly, they can add to fuel delivery problems.
Tom
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Old Henry |
12-27-2014 @ 7:30 AM
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Senior
Posts: 738
Joined: Apr 2010
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Many use and recommend Airtex E8902 for 6 volt and Airtex E8016S for 12 volt. I use the 6 volt one back by the gas tank. Attached is a photo of my installation.
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GJRoberts |
06-08-2015 @ 6:49 AM
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Member
Posts: 1
Joined: Apr 2015
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Can the Airtek be used in line with the mechanical pump? Is it wired as a momentary on system until the engine starts, or is a full time pump bypassing the mechanical system?
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Old Henry |
06-08-2015 @ 2:27 PM
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Senior
Posts: 738
Joined: Apr 2010
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AirTex can be used in line with mechanical pump which will pull through it. I use my electric pump enough that I have it on a toggle switch and running through a pressure regulator when the vapor lock just won't go away.
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