Re: Fuel punp valves
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The diaphragm pump from Kanters was a 'fresh' rebuild as I had to wait for it to come into stock, so I am presuming it should be fine as I trust Kanters to provide quality components in their rebuilds. Re the pressure regulator, I did purchase one, I believe made by Holley and it was around $50, so think it should be okay quality. It is a 1-4 PSI range and I had the fuel going through it before it went into the engine pump to minimize the pressure on the diaphragm for the aforementioned reasons. If everything is working the way it's supposed to, I should be okay. Thanks for the info. Chris
Posted on: 2019/2/9 15:51
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'If you think you can, or you think you can't - you're right!' Henry Ford.
1939 Packard Six, Model 1700 |
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Re: Fuel punp valves
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An electric pump can be placed just about anywhere in the fuel line. The preferred location is as close to the tank as possible. The reason for this is to pressurize as much of the fuel line as possible to avoid vapor locking. Vapor lock occurs in the non-pressurized part of the fuel system. No experience placing the pump close to the carburetor and will rely on the recommendations of those who have done it this way.
Posted on: 2019/2/11 12:27
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And make happen What occupies our mind... (W. Scherer) |
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Re: Fuel punp valves
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Also John, those little pumps push fuel a lot better than they vacuum it. Interesting point on vapour lock, I did not know that it only occurred in the non-pressurized portion of the fuel line. The more I learn about 'vapour-lock' the more it seems like kind of a 'phantom symptom', a blanket explanation for bad performance. My understanding of it, is the fuel gets hot enough in the line to vapourize and the diaphragm pumps won't pump vapour, thus 'vapour lock'. Based on what you are saying, this would have to happen between the tank and the fuel pump inlet and I can't imagine a scenario where the fuel could get hot enough to 'boil' south of the pump intake. It shouldn't get that hot that far away from the manifold, should it??? Between the pump and the carb, it sure can, but then the fuel is under pressure - shouldn't vaporize, right????
Posted on: 2019/2/11 12:45
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'If you think you can, or you think you can't - you're right!' Henry Ford.
1939 Packard Six, Model 1700 |
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Re: Fuel punp valves
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Forum Ambassador
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Gasoline on the suction side will have a depressed boiling point, thus the propensity to vaporize faster than the same liquid would have at atmospheric or elevated pressures.
Posted on: 2019/2/11 12:53
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Re: Fuel punp valves
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I have heard for years and many times the electric pumps push better than they suck. This may be true, but no facts have come forth as far as I know to prove this claim. Anyone?
Posted on: 2019/2/11 18:29
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And make happen What occupies our mind... (W. Scherer) |
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Re: Fuel punp valves
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This off the 'H&H Classic Car' website. In their instructions on how to install an electric fuel pump, they list the 'DON'Ts' and this is the #1 caution:
Quote: Keeping the electric pump far away from the gas tank: Electric fuel pumps don't pull fuel as well as they push it. So, you want to install it close to the gas tank for optimal performance. For what it's worth??...... Chris
Posted on: 2019/2/11 20:19
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'If you think you can, or you think you can't - you're right!' Henry Ford.
1939 Packard Six, Model 1700 |
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Re: Fuel punp valves
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Forum Ambassador
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JW, just as a generalization almost all mechanical pumps are better pushers than pullers. You might want to browse some engineering references.
Posted on: 2019/2/11 21:27
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Re: Fuel punp valves
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Looking on Google, I came across a small device that will run the electric pump for only three seconds when the ignition is turned on, then shut it off. It is available in both 12v and 6v models but no mention of polarity. Of course, it would be better with the solenoid pump or a vane pump with bypass, some of which have it built-in.
Posted on: 2019/2/11 21:51
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Re: Fuel punp valves
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Looking on Google, I came across a small device that will run the electric pump for only three seconds when the ignition is turned on, then shut it off.
Is it called a Toggle Switch ?
Posted on: 2019/2/12 10:49
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