[Diy_efi] Sending unit confusion

[Toyota Supra]

hey esteban, thanks ! :)

the pump would run dry if i left it on all of the time, hence burning up 
inside due to the gasoline acting as a heat displacement unit and a 
lubricant.
i don't want to stop and start it much, hence why i have tried to implement 
some hysteresis, hopefully it is enough to keep such a problem from 
occuring.

-j






From: "Esteban" <s371522 at student.uq.edu.au>
>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>To: "'List for general do-it-yourself EFI talk'" <diy_efi at diy-efi.org>
>Subject: RE: [Diy_efi] Sending unit confusion
>Date: Fri, 21 Feb 2003 13:46:20 +1000
>
>Hmm, don't electric motors generally hate stopping and starting? I'd be
>leaving it on the whole time. I haven't really looked at your fuel
>system wrt fuel flow, but I'd imagine your fuel reg will take care of
>the high pressure side, and leaving your low pressure pump on all the
>time is only going to fill your surge tank to capacity (which is what
>you want) and then overflow back into the main tank.
>
>I'd be worried about reliability issues (and the kiss principle) if one
>was to start turning pumps on and off mid-flight so to speak.
>
>PS: supra's rock hard!
>
>Esteban :)
>
>-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
>On Behalf Of Mark Bowers & Family
>Sent: Friday, 21 February 2003 0:44
>To: List for general do-it-yourself EFI talk
>Subject: Re: [Diy_efi] Sending unit confusion
>
>
>Hi J,
>
>OK, I Have read you post on the voltages you are reading on the 'yaller'
>wire. The reason that it reads 12 v when disconneted is that you are
>measuring back into the open circuit that is normally the output of the
>guage or internal dash regulator.
>
>The key fact that you have measured is the 0 to 55k range of the pot. In
>the best version of your application, the voltage feed will come from
>the circuit, not the dash. Question: Does this auxiliary half of the
>tank hook to a fuel guage? Will you leave this connected?
>
>While starting to draw this up today, I had a new qyestion: Do you
>really want this transfer pump running all the time? It will reduce the
>pump's reliability by a lot. An alternative is to have the transfer pump
>actuate in a cyclic basis to pump so much fuel at a time. Whether this
>works or not depends on your use. If you are racing, espcially off-road
>or some racing where the fuel can easily slosh back to the auxiliary
>tank, it might better to run the transfer pump all the time, like you
>seem to be planning.
>
>Mark B.
>----- Original Message -----
From: Toyota Supra <turbosupramk3 at hotmail.com>
>To: <diy_efi at diy-efi.org>
>Sent: Thursday, February 20, 2003 3:46 PM
>Subject: Re: [Diy_efi] Sending unit confusion
>
>
> > ok, just to be clear, this sounds like you want me to do this in place
>
> > of the sending unit, is there a way to make the sending unit work
> > outside of the car, but putting 12vDC into the yellow wire, and then
> > putting
>something
> > on the other side of the second wire (brown with black)?
> >
> > the particular reason this appeals to me, is i can then move the float
>
> > up and down, and watch it turn the circuit on, and turn it off, as
> > well as visually see how much travel the float has to make, before
> > overcoming the hysteresis.
> >
> > if not, i'll pick up a 55k pot today, the manual says that it should
> > read
>0
> > to 55k when functioning properly
> >
> > thanks perry
> >
> > -j
> >


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