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... Over the years I've wondered about installing a "switched" electric fuel pump in-line with the mechanical pump. Something I could use when I wanted. However, I always ended up being concerned that when I was not using it, the fuel flow through the mechanical pump would be severely restricted by the non-running elec pump, and therefore not a really good plan of attack. Feel free to enlighten me and thanks in advance.
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Re: Aux. Elec Fuel Pump, John McG, et al...
Just an idea. I have no expertise or experience with something like that setup. Would installing a bypass fuel line around the electric pump with on/off valves on each end make any sense? That way you could isolate the mechanical system when you want it, and then bring in the electrical pump when you want it by turning a couple of valves. -
Re: Aux. Elec Fuel Pump, John McG, et al...
One will pump through the other, even if the other is off or not working. The electric fuel pump will push through the mechanical, even if the mechanical is not running. The mechanical will suck through the electrical, even if the the electrical is off. Don't need bypass lines or on/off switches. Just plumb the electrical one upstream of the mechanical one. I'm going to do that someday soon so I can use the electrical fuel pump to push gas into a dry carburetor bowl. The gasoline in my carburetor goes away after the car sits unused for over 1 week. 2 pumps also provide redundancy in that area. I've got a C1, and I'm going to try to put the electric one in the gas tank compartment. Going to look for a quiet one because that compartment is right behind the passenger compartment. While I'm in there doing gasoline line plumbing, I'm also going to put in a fuel shutoff solenoid as an antitheft device.Comment
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Re: Aux. Elec Fuel Pump, John McG, et al...
why don't ya plumb a fitting to allow alcohol(not jack daniels, ya big dummy) to be introduced to the carb system when the nitrous is swithched on?you do have experience in plumbing nitrous to a 283/283, don't ya? what ya think that nomad is gonna turn in the quarter, with our without the airstream/airstreams attached? mikieComment
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Past Mikie's Bed Time Again... *NM*
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Re: Aux. Elec Fuel Pump, John McG, et al...
Dennis,
While the mechanical pump will pull through the electric pump, My thoughts are why mess with turning off the electric pump at all? Just hook it to the ignition switch so that it comes on whenever the switch is turned on, and enjoy the benifits of it all the time. Electric pumps are way beyond the point where reliability is an issue as long as you put a filter ahead of the pump to protect it from trash.
Regards, John McGrawComment
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OK John, I'll do it your way... Now, any thoughts
on suggested make and model pumps out there ??? Thanks, DennisComment
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the problem with electric pumps feeding
the stock pump is if the stock pumps diaphram ruptures the electric will fill the pan full of gasoline and then there could be a problem.Comment
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Good point Clem - Thanks, DC *NM*
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Re: Good point Clem - Thanks, DC
Have a look at the Aeromotive line of fuel pumps and accessories. (do an internet search for their webpage.) They also sell an electric fuel pump controller. This reduces the drive voltage to the pump at low engine RPM's so the pump does use a lot of electrical power/make noise/etc. I'm installing two redundant strings in the rear of my 68 C3. The fuel line from the tank goes to a Y juction and splits to the two fuel pump/canister filter strings and then back to a Y juction feeding the main fuel line going to the front of the car. I use one way check valves to keep fuel from the active pump circulating back through the off pump. Why am I doing this? A little anti-theft protection and the redundancy is to make sure I don't come to a stop if I loose an electric pump in Apache land.Comment
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