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

[Toyota Supra]

it will be torn off if anything ever goes underneath the car (small animal, 
or any type of road debris), the fittings required would be positioned under 
the frame rail and under the driveshaft, it would also put it dangerously 
close to the driveshaft. i've contemplated the gravity thing, but just can't 
have that hanging over my head.

i was looking at using the 555 circuit, but i would need a little help in 
values and schematics to do so. if you have any suggestions or thoughts, i'm 
all ears :) . thank you for taking the time to reply

-j






From: Mike <erazmus at iinet.net.au>
>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: Mon, 11 Nov 2002 14:01:31
>
>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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> >
> >
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