Suction through a unpowered Tank Pump.

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Having taken both apart you can to a limited degree draw threw them.
The rollers are free floating. and the turbines have air gaps in the design
Bruce

>OK, got some time to look through the shop manual. What Jon wrote
>below is most likely true. (I just needed some place to hook into
>this thread).
>
>On a '92 Camaro/Firebird, the tpi intank pump is a roller vane
>design. I believe that this is a positive displacment pump, and
>you can't draw through it. (Unless of course your mad max)
>
>The TBI pump, on the other hand is a twin-turbine design. It's
>also a lower pressure pump. This design can most likely be drawn
>through...
>
>hth
>
>BobR.
>
>Jon Fedock wrote:
>> 
>> A brand new AutoZone mechanical would NOT pull through a stock TPI pump.....
>> Jon
>> 
>> -----Original Message-----
>> From: David C. Allen <davida at primenet.com>
>> To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
>> Date: Saturday, August 07, 1999 8:44 PM
>> Subject: Re: Suction through a unpowered Tank Pump.
>> 
>> >Hello Bruce
>> >That's what I am trying to do!  The 86 suburban already has a return line
>> >for the mechanical fuel pump. The chassis fuel lines are in two sections
>> >front and rear they meet  around the transfer case. they are interconnected
>> >with rubber fuel line. This is the factory location for the fuel injection
>> >fuel filter. So my plan was to replace the rear section of fuel lines from
>> >a 90 suburban, replace the fuel tank also a 90 suburban, run the pump
>> >wiring  and interconnect the front and rear lines. so the only double work
>> >would be at the interconnection.
>> >
>> >But the big question was could the mechanical pump pull fuel through the
>> >in-tank pump?
>> >
>> >David
>> >
>> >
>> >:
>> >>Try Ron Gregory, he maybe lurking  here, or at the syty at syty.org list
>> >>I'd still perfer just to do it right once.  Changing from all suction to
>> >>high pressure lines, and with the wiring, I'm too lazy to make a project
>> out
>> >>being undr it 2x when one will do.
>> >>Bruce
>> >> >I would like to do the fuel tank change, and install the new in-tank TPI
>> >> >Camaro  pump. The engine driven pump is only 3 months old, and the
>> >> >un-powered operation  would only be for a few months.
>> >> >
>> >> >Any good places on the web to buy pumps????
>> >> >
>> >> >David
>> >> >
>> >
>> >
>