Voltage regulator, now fuel system boosters

[Walter Sherwin]

Just a thought..............How about running two parallel in-tank pumps &
socks, at full voltage, all of the time, and installing two bypass
regulators in the return side of the fuel recirculating loop so as to avoid
non-linear pressure response?  This could ensure ample flow, adequate
control, and less electronic gadgetry?

Both Bosch and Walbro have some hefty, in-tank, submersible pumps that in
tandem can feed well beyond 1000 Hp!




-----Original Message-----
From: Greg Hermann <bearbvd at sni.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Saturday, January 02, 1999 11:34 AM
Subject: Re: Voltage regulator, now fuel system boosters


>>In a message dated 1/2/99 11:38:18 AM Eastern Standard Time,
bearbvd at sni.net
>>writes:
>>
>>> >How about using a big pump and cutting the voltage when all that
>>>  >capacity is not required? Will the pump last longer, etc.???
>>
>>Some Buick & Syphoon turbo blokes use a *staged* pump
>>arrangement that allows you to pre-set the boost level at which
>>a second in-tank pump is switched on.  The kit includes a 30amp
>>relay and wire harness, etc   I believe one such kitt is available from
ATR
>
>Who and where is ATR??
>
>>Some users of this setup report a 2-5 psi jump in pressure when the
>>extra fuel volume, from a second Walbro 308 pump,
>
>See the comment below, but this jump is simply demonstrating what I am
>talking about below in terms of accuracy of pressure regulation. The port
>in the regulator used is not big enough, plus it needs time to react.
>
>Who is Walbro, where are they.??
>
>Basically, I am looking for sources for good quality, large volume, but
>really don't have to be high pressure, submersible fuel pumps.
>Controlled voltage to a pump is still more elegant than staging, since
>varying voltage to a DC motor varies its speed (and therefore the volume
>output) infinitely.  Hence the desire for variable speed pump drive. Tom is
>RIGHT! Running a big pump at lower voltage/speed most of the time will do
>the job, and increase pump life IMPRESSIVELY!
>If one wants to get seriously complicated, it is very feasible to vary the
>speed of one pump, and then stage in a second, constant speed pump for big
>loads. (The first, variable speed, pump slows back down when the second
>pump first comes on, then speeds back up as load increases further.)
>
> hits the FP regulator .
>
>It is way easier (and much more efficient and accurate) to regulate
>pressure precisely if flow through the pressure regulator is fairly
>constant.
>
>> I only wish to own/operate such a thirsty beast in my lifetime.  8~)
>
>The output would certainly be nice, but maybe with about 10% less thirst
>would be even nicer!! :-)
>
>Regards, Greg
>>    Mike V
>
>