Electric Fuel Pump Installation Instructions
You can leave it in place, but remove the fuel lines.A cracked/ruptured/broken diaphram will end up dumping fresh fuel into the oil pan.! Unless you like that idea.!?There is NO good or safe reason for leaving the mechanical pump in the fuel system after adding an elect. Pump.Many 'may' have gotten away with this practice.but I'd just bet that the ones who haven't gotten away with it. You'll NEVER hear from them because they don't want to be ragged on by everyone.!Just plain and simple.a BAD practice.Mike. I had quite a few 6 volt flathead cars with the stock pump, added a 6 volt 'Autopulse' electric pump on my '36 (next to the tank) and could toggle it off when running.I was an auto mechanic, so maintenance was performed religiously.Worked fine, so.never say 'NEVER!'
If the mechanical fuel pump diaphragm fails, it is usually due to an old or third rate pump.Most fuel pump diaphragm failure sucks oil, emitting a smoke screen from exhaust. Otherwise, occasional checking of the dipstick may indicate the presence of gasoline in the oil.it can also be detected by its odor.
As a primer i see no issues. If your mech stops working there is a reason and pumping gas through it is probably not real good. If you want the look of the pump then make a dummy mech pump and run the electric.I can leave a 6v mech fuel step up for weeks. Couple pumps of the spoon, little choke, and a few cranks it fires right up. I would say its due to non eth fuel, a good carb that keeps fuel in the bowl, tested fuel pump, and luck.
A decent coil and condenser isn't a bad thing either.Had issues with a vapor lock issue but it turned out to be a coil issue. Guys thanks for all the replies to my question. To answer a couple questions-Reason for going to the electric pump is because the mechanical one isn't getting the job done, not putting enough fuel into the carb.
We replaced the steel rod in the fuel pump when motor was rebuilt about 4 years ago & cars had few miles put on it since then.We are interested in leaving both pumps hooked up & functioning. After reading all the posts I like the idea of a toggle switch, using the electric pump to prim the carbs, then shutting it off. We'd have to figure out why the mechanical pump isn't providing enough fuel though.One of you wrote 'Rotor Carters will not flow through when off. Only the push pull ones will.' We bought a Carter P60504.
Will the mechanical pump pull thru this Carter if the electric pump is off? I'm not familiar with rotor pumps.thanks again.
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Universal Electric Fuel Pump
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Wiring An Electric Fuel Pump
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