MikeDeFelice Posted July 3, 2020 Share Posted July 3, 2020 😀I HAVE REPLACED 4 FUEL PUMPS IN THE LAST MONTH. THEY LAST ABOUT 10 MINUTES. THE FAILURE MODE IS I GO FOR A RIDE 5-10 MINUTES AND EVERTHING IS FINE. THE NEXT TIME I START THE CAR THE PUMP FAILS. I DISECTED THE LAST PUMP AND A COMPONENT ON THE PUMP IS BURNED. ALL PUMPS ARE THE SAME PHYSICAL APPEARANCE BUT FROM DIFFERENT SUPPLIERS. I CHECKED FOR OVER VOLTAGE CONDITION. FIRST PUMP HAS BEEN ON THE CAR OVER FIVE YEARS WITHOUT A PROBLEM. H E L P !!!! Link to comment Share on other sites More sharing options...
PFitz Posted July 3, 2020 Share Posted July 3, 2020 I've installed a few of these Airtex 6 volt low pressure pumps from Summit Racing in my customer's cars and no problems with any. https://www.summitracing.com/parts/atx-e8902 One of my customers had the high pressure version installed by another shop and it kept locking up the float needle in the carb. Depending on pump design, that may cause back pressure long enough to overheat the pump ? Are the ones your using high, or low pressure ? Paul Link to comment Share on other sites More sharing options...
MikeDeFelice Posted July 3, 2020 Author Share Posted July 3, 2020 LOW PRESSURE. 3 WEBERS ON MY 1930 FRANKLIN SPEEDSTER. MIKE Link to comment Share on other sites More sharing options...
PFitz Posted July 3, 2020 Share Posted July 3, 2020 By low pressure I mean 2-4 psi, same as Franklin rated the original AC mechanical pump. But some think the 6-8 psi pumps are low pressure compared to fuel injection pumps. What is the PSI range of your Webers ? If you have to use an electric on a 6 volt era car all I can advise is try the Airtex low pressure. Better suited to float needle carbs and plenty of volume for even the bigger engines of that era. BTW the AC mechanical pump on your Franklin is a very good pump and it is rebuildable. Once properly rebuilt they last a lifetime, or two. Paul Link to comment Share on other sites More sharing options...
MikeDeFelice Posted July 3, 2020 Author Share Posted July 3, 2020 PAUL, MY PUMP DOES NOT LOOK LIKE THE PIC OF AC PUMP I SEE THE REBUILD KIT FOR. Link to comment Share on other sites More sharing options...
PFitz Posted July 3, 2020 Share Posted July 3, 2020 (edited) Mike, Don't worry about the pictures. Call Then And Now Automotive - aka Antique Parts Cellar, and ask Tom for a 1929-30 Franklin AC pump kit. He has the listings and will give you the correct kit. That's how I've been ordering them from him for a few decades. http://www.then-now-auto.com/ Be careful with that pump base. They only used that model AC on '29 and '30 Franklins and they are rare as hen's teeth !!!!! Paul Edited July 3, 2020 by PFitz (see edit history) Link to comment Share on other sites More sharing options...
MikeDeFelice Posted July 3, 2020 Author Share Posted July 3, 2020 PAUL, I ORDERED THE PUMP KIT. I MENTIONED THE PUSHROD HAD BEEN ADDED ON TO TOM. HE SAID IT PROBABLY WAS NOT NEEDED. DOES ANONE HAVE A SPEC ON THE LENGHT OF THE ROD? IT IS RIGHT AT 8 INCHES. NO THOUGHTS ON THE ELECTRIC PUMP. DO U KNOW WHAT PRESSURE THE PUMP IS SUPPOSED TO PUT OUT? I NEED TO FIND OUT WHAT THE WEBERS REQUIRE. THEY RAN FINE ON THE ELECTRIC UNTIL IT STOPPED RUNNING. MIKE Link to comment Share on other sites More sharing options...
PFitz Posted July 3, 2020 Share Posted July 3, 2020 (edited) On the Club's website, you can look up all the specs on the factory drawing by using the drawing (part) number in the 30 parts book. The original Franklin AC pumps were rated 2-4 psi. Anything over 1 psi works fine. If your electric pumps were higher than 4 psi and the carb float level was set for them, you'll need to reset the float level with the rebuilt original, or it'll be too low. Paul Edited July 3, 2020 by PFitz (see edit history) Link to comment Share on other sites More sharing options...
MikeDeFelice Posted July 7, 2020 Author Share Posted July 7, 2020 ORDERED THE PUMP KIT. I BOUGHT ANOTHER ELECTRIC PUMP WITH A MOTOR. IT FAILED THE SAME WAY. 10 MINUTES OF RUNNING TURN IT OFF TURN IT ON DOES NOT RUN. Link to comment Share on other sites More sharing options...
DBKissel Posted July 8, 2020 Share Posted July 8, 2020 I ordered a 12VDC Carter P4070 In-Line Electric Fuel Pump from Amazon for ~$66. Running on a 6 VDC system has the pump going at 1/2 speed. The pressure is 2.5 psi however I did add a dial type pressure regulator [not sure if it is helping much]. Its dialed down to 1 psi. Lower is better since the vacuum tank would supply by gravity and head pressure from about 1 foot above it. Hope this helps. Link to comment Share on other sites More sharing options...
DBKissel Posted July 8, 2020 Share Posted July 8, 2020 Don't try this on anything but a rotary [DC] motor style. The other pumps usually have a pulsing circuitry and would not accept the 1/2 voltage. Link to comment Share on other sites More sharing options...
edinmass Posted July 8, 2020 Share Posted July 8, 2020 Running an electric fuel pump on a car that was designed for a vacuum tank is extremely dangerous and is inviting a fire. It should NEVER be done. Some use them as a boost pump to prime the system, another BAD idea. The vacuum tanks work fine, it just takes effort. 1 Link to comment Share on other sites More sharing options...
maok Posted July 8, 2020 Share Posted July 8, 2020 Is it possible that the failed electric pumps were running dry and over heating because those 3 webers a pulling too much fuel and the pump cant keep up? Link to comment Share on other sites More sharing options...
PFitz Posted July 8, 2020 Share Posted July 8, 2020 (edited) 2 hours ago, maok said: Is it possible that the failed electric pumps were running dry and over heating because those 3 webers a pulling too much fuel and the pump cant keep up? It's only a 274 CID engine. For carbs to run any normal pump dry would flood the engine first. Mike's engine has a very good AC mechanical pump, that if properly rebuilt, is simple, reliable, designed for that engine, and will work very well for a life time. There is no need of an electric, except, with today's quick to dry out gasoline, to prime the carb after a few weeks sitting unused. Paul Edited July 8, 2020 by PFitz (see edit history) Link to comment Share on other sites More sharing options...
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