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By Mats Paulsson - 3 Years Ago
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Hi all.
I have a electric pushing(4psi) fuelpump that i wold like to combine with my stock mechanical pump so i easy can prime the carburettor when i have not used the car for a long time, and it can also be nice to have a spare pump which is already mounted if something happens with the mechanical one.
Can i mount the electric pump before the stock mechanical pump on the same fuel line and push the gas through the mecanical pump, or do i have to do it some other way?
I can blow throgh the electrical pump when it is not turned on.
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By MoonShadow - 3 Years Ago
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I mounted an electrical pump near the tank. I don't normally run it on the street so it will pull through. I use it on the drag strip as with the HP427 fuel pump I was starving for fuel in the high end of 2d gear. Of course I'm running it with a 4-71 supercharger.
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By paul2748 - 3 Years Ago
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Yes, if the pump will allow a pull through - and the pump should be mounted as close to the tank as possible so it can "push" the gas.
Mats Paulsson (1/3/2022)
Hi all. Can i mount the electric pump before the stock mechanical pump on the same fuel line and push the gas through the mecanical pump, or do i have to do it some other way? I can blow throgh the electrical pump when it is not turned on.
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By DryLakesRacer - 3 Years Ago
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I understand a pulse type is best for this. Others might know.
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By slumlord444 - 3 Years Ago
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One thing to keep in mind when running the electric pump through the mechanical pump is that if the diaphragm in the mechanical pump fails the electric pump will pump fuel directly into the crankcase. I have run this setup for many years without a problem. On the last engine rebuild I decided to run an electric pump only but wanted to keep the vacuum assist for the wipers on the mechanical pump working. I ended up gutting the fuel side of the mechanical pump so it was only a fuel block and left the vacuum pump working and it all looks stock.
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By PF Arcand - 3 Years Ago
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H'mm, that's an interesting point that Slumlord makes about what can happen if the diaphram fails in the original pump... The results of that could be nasty! For what the original poster wants the electric pump for, I'd have 2nd thoughts about doiing that.. In any case, when I have to start the car after a long layoff, I just lift the lid on the Air Cleaner & pour about 3/4 oz of fuel into the front barrels of the carb. Then wait a few seconds, turn the key & it starts immediatly...
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By 312YBlock - 3 Years Ago
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Me too, I just like to let it crank till i get oil pressure before priming it.
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By Ted - 3 Years Ago
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I have an electric pulse fuel pump located by the fuel tank on my ’50 Ford (still 6 volt) that’s hooked up to a toggle switch simply to prime the carburetor when the car sits for 3-4 weeks without running. Other than using the electric pump to prime the carburetor before starting it after extended periods of down time, the electric pump is not turned on. That electric pump saves a lot of wear and tear on the starter as well as preventing excess camshaft lobe wear also due to excessive grinding on the starter.
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By 312YBlock - 3 Years Ago
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I installed a fuel line check valve available from CASCO. The car starts with the turn of the key after about two weeks of sitting, fuel boiling and evaporation don’t seem to be an issue.
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By DANIEL TINDER - 3 Years Ago
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slumlord444 (1/3/2022)
One thing to keep in mind when running the electric pump through the mechanical pump is that if the diaphragm in the mechanical pump fails the electric pump will pump fuel directly into the crankcase.
While it is eoften recommended to use a ‘dead man’ type toggle switch to avoid this, I opted for the ‘on/off’ type (though you DO have to remember to switch it off after the carb is filled) since it gives the option to still maintain fuel delivery and drive home if the mechanical pump should fail. It is also handy to rule out that issue when diagnosing engine trouble.
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By DryLakesRacer - 3 Years Ago
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I know mine will be a little harder to start this weekend because it’s been 4 weeks. The temperature has not been over 60 which maybe a help. This time I’m going to remove the air cleaner and see if either carb will have some fuel lift to squirt from the accelerator pumps. It nice to be able to pump 2 carbs. I do not like to pour fuel into carbs. My son and I on his race engines use the bowl vent with a hose attached to it and a fill bottle like a ketchup or mustard squeeze bottle. Holley’s are really easy. I can do this on WCFB’s also and as I remember most have a way. Just another thought….
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By Mats Paulsson - 3 Years Ago
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Thanks a lot all for your good answers!
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