[Diy_efi] Re: Looking for circuit to turn transfer pump

[Mike]

why not just have a pipe between them and let gravity do its thing,
and if you wanted to be real clever you can put it through
a solenoid...

Make the pipe big enough so it can handle full flow, say 5/8"

Why make it complicated with a pump ?

mike



At 10:02 PM 9/11/2002 -0500, you wrote:
>hey bevan, thanks for the reply, maybe this will help clarify ...
>
>
>here are the specifics, my gas tank is a saddle tank, meaning that it has 
>two sides to it like saddle bags on a horse. now the pumps are on the left 
>side, and the mechanical venturi valve that used to transfer the fuel from 
>the right side, had to be removed.
>
>so my dilema is, how do i get fuel from the right side of the tank, to the 
>left side where the fuel pumps sit, so that i am not driving around on only 
>a 1/2 tank of usable gas, even though the entire tank is full?
>
>well, my design thought was to have a transfer pump intank, that drew from 
>the right side, to the left side, at all times that the car was on, except 
>for when the right side of the tank got low on fuel. this is because the 
>fuel acts as a lubricant to the transfer pump, and if it ran dry for any 
>period, it would probably burn up.
>
>so the way i decided to control the transfer pump was to use the existing 
>sending unit that is in the right side of the tank (which reads 0 to 3.5v, 
>full being 0v - bone dry being 3.5V) and use that sending units output as a 
>reference signal for the circuit, and having that circuit turn a relay off 
>(or on) to control the power to the transfer pump.
>
>i appologize if this reads confusing and that it is so long, but i wanted to 
>be as detailed as possible. if you think your circuit design would work, i'd 
>be very grateful if i could have a copy of it. thank you for the reply
>
>-j
>
>
>
>
>
>
>
>
>>From: "Bevan Weiss" <kaizen__ at hotmail.com>
>>Reply-To: diy_efi at diy-efi.org
>>To: <diy_efi at diy-efi.org>
>>Subject: Re: [Diy_efi] Re: Looking for circuit to turn transfer pump off at 
>>certain voltages
>>Date: Sat, 9 Nov 2002 12:30:52 +1300
>>
>>
>>----- Original Message -----
>>From: "Steve Hutson" <customfab at websurf.net>
>>To: <diy_efi at diy-efi.org>
>>Sent: Friday, November 08, 2002 11:59 AM
>>Subject: [Diy_efi] Re: Looking for circuit to turn transfer pump off at
>>certain voltages
>>
>>
>> > > Message: 3
>> > > From: "Toyota Supra" <turbosupramk3 at hotmail.com>
>> > > To: diy_efi at diy-efi.org
>> > > Date: Thu, 07 Nov 2002 12:50:40 -0500
>> > > Subject: [Diy_efi] Looking for circuit to turn transfer pump off at
>> > certain voltages
>> > > Reply-To: diy_efi at diy-efi.org
>> > >
>> > > if anyone has this, please reply to me privately, i can't seem to find
>> > > anything online, thank you very much
>> > >
>> > ---------------
>> >
>> > I'm not sure EXACTLY what you are referring to by xfer pump or 'certain'
>> > voltage. I designed a simple circuit (you can build for~$20) that uses a
>> > return signal from any 5v referenced sensor (IE TPS, CLT, IAT, 
>>ect.)(0-5v
>> > return) that can be infinitely adjusted (with hysteresis) and will 
>>control
>>a
>> > relay for MANY uses. With slight mods, could be used at any voltage 
>>level.
>> > Any help?
>>
>>I'm not sure exactly what's required, but it sounds like a comparator with
>>hysteresis...
>>In which case a simple opamp, with some feedback applied would do the 
>>trick.
>>Assuming that it's a voltage level input, if it's current then you would
>>need a current->voltage conversion (ie maybe as simple as a resistor or if
>>required a more complex current->voltage converter).
>>However this is assuming we're talking about a 0-5V signal, if we're 
>>instead
>>referring to a 0-50uV (or some other such) signal then ofcourse things are
>>different...
>>
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