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WTB exhaust pressure driven petrol pump

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Does anyone on the list have a exhaust pressure driven petrol pump off an early 1915ish American LaFrance?

What other relatively common American car of that 1915ish era used an exhaust pressure driven pump I could get??

How do they work anyway??? Do they have a diaphram that pulses with the pressure of the exhaust pulses and a one way valve down the line to keep the pressure in the line???

I will in reality have a electric petrol pump and pressure regulator hidden under the seat but I want to have the exhaust pump on the car to look the part.



1915 Type 12 American LaFrance Speedster

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I have heard of using exhaust to pressurize fuel systems, often in Model T's. It requires sealing the tank--usually the vent on the cap, and putting a flame blocker in the line from the the exhaust and the tank. I don't think there was anything much more to it than that. As I understand it, the vapor density in the gas tank is too high to be explosive. Gasoline has to be at a pretty specific air/fuel mixture to explode. Also, exhaust has no oxygen, which should inhibit explosions and fires.

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You are referencing a Lunkenheimer style pressure device. It is not simply a pressure line to tank, as sparks and the resultant possible premature ignition of the gas in the tank is not desirable.

" The Lunkenheimer fuel pump originally used a small copper tube from the head, just above an exhaust port, to channel air pressure to a device in the dash that incorporated a spring, valve and filter to keep hot carbon embers from flying into the fuel tank. Despite the filter, the system still threw embers into the gas tank, so they kept the Lunkenheimer in place, but disabled it in deference to an electric fuel pump powered by a hidden 12-volt battery. "

excerpt from http://www.hemmings.com/hcc/stories/2005/05/01/hmn_feature8.html

This article discusses a Stoddard Dayton. My friend Greg Cone is restoring a 1912 S-D which has this system. They are rare and hard to come by.

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