![]() ![]() Every car in the fleet we took care of that got his treatment ran beautifully, and never gave the slightest fuel delivery problems, including grueling tests like the 1999 Packard centennial parade in Warren. He was rather emphatic about getting a modern diaphragm, made from material that didn't mind today's gasoline, having two relatively flat halves to fasten together, then carefully cross-torquing the halves together so as to not distort the halves. He insisted that what people were experiencing was (OE mechanical) fuel pump heat distortion that was breaking the prime of the pump. I worked with a very experienced antique car mechanic who insisted that vapor lock was a myth, an old wives tale. My cars are form the 50's -60's I don't have this problem. I say - go for a SIMPLE "series" installation - with your new electric fuel pump mounted as LOW and as CLOSE to the gasoline tank as possible.Ī friend who works as a fuel compatibility engineer for Ford, who is also into old cars swears by it, with some scientific reasoning (you'll have to ask him). But there is a greater risk of getting rear-ended if your car vapor-locks. Yes - I agree.there is a REMOTE risk of a diaphgram failure. (actually, in my installation, I have TWO in paralell, in case 1) one goes bad.and/or/.2) someone in a Cadillac V-16 needs to be taught a lesson on a long uphill high speed grade.!). I got so tired of vapor lock, and of the risk of a diaphragm failure, I simply removed the diaphragm pump from my car ( a Packard V-12) and run off the electric. There are still several vendors selling 6 volt electric fuel pumps. Simple solution.PRESSURIZE THE FUEL AT OR NEAR THE FUEL TANK. I have NO explanation why some pre-war - even some 50's cars NEVER seem to get vapor lock, others do at the drop of a hat. Thus today's gasoline is much more prone to vapor lock. Keep the fuel line COLD on a hot day (not practical).or pressurizing the fuel from the tank foward, is the simple solution.Īlso, modern fuels have a lower "Ried Vapor Pressure" than gasoline avail. Cow bells, clothes pins, and praying to the Great Space Monkey only SEEM to help coincidentally. It gets HOT under a car on a hot day, especially on that portion of the fuel line BEFORE the fuel gets to the fuel pump. Such as when you SUCK it from a tank by a fuel pump. Vapor lock occurs when the pressure on the fuel is REDUCED. For the simple reason that when gasoline is under pressure, it will not turn to a vapor. Vapor lock does not and CAN NOT occur between the fuel pump and the carb. In the old days I often marveled at the guys who put clothes pins on the fuel lines, cow-bells, or prayed to the Great Space Monkey. Let's first remember WHAT vapor lock is, and WHERE it occurs. ![]()
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