Suction through a unpowered Tank Pump.

[rr]

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
> >> >
> >
> >