fuel pump

[Mike Dillon]

External pumps, do have their limitations. By putting the pump low and close to 
the tank the problem is not eliminated but it is less likely. In the case where
you are under hard acceleration for a long time on a low tank, there is a good 
chance that the external hi pressure pump will try and suck air with a stock
tank. On most 
go fast cars this is probably not a real problem, but more likely to happen with 
a 4X4 on a long hill climb. One way to get a round the problem for less than 
a $500 tank, is to use a standard low pressure electric pump to fill a small
tall skinny 
tank and feed the external high pressure pump from the bottom of the small tank.
The volume of the small tank needs to be large enough to feed the engine for the 
longest expected time the car/truck will be rapidly accelerating or for the time
it 
takes to climb longest hill you expect to run into. The small tank needs a
return mounted close to 
the top of it to allow air/vapor to return back to the main tank, and the TBI
return would 
also need to be plumbed in to it. 
 I would guess that 90% + of the people would never encounter a problem omitting
the small tank. On a 4X4 it would be much more likely to happen in a place where 
having the engine die could endanger your life. On a go fast car you just lose
some time. 

Mike D.  


Date: Fir, 22 Jun 2001 16:34:15 -0700
From: "Bob Wooten" <r71chevy at earthlink.net>
Subject: RE: fuel pump

I have a 71 Camaro with a Super Ram on it & I have a bosch external pump.  I
mounted it just forward of the axel housing (right under the rear passengers
butt).  I have 1/2" Aluminum line coming from the tank to the pump & then
from the pump up to the -8 line in the engine compartment to go across to
the Fuel rail.  right under the front passengers butt is the fuel filter.  I
have not had any problems in the 3 or 4 years that I have been running it.

I have been meaning to get under the car & take some pictures of the thing
to post on my web site & I suppose that now is as good a time as any.  check
back in a next week some time & maybe I will have them posted by then.

BW
www.r71camaro.homestead.com


- -----Original Message-----
From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
Of Hash
Sent: Monday, June 23, 1997 11:47 AM
To: gmecm at diy-efi.org
Subject: fuel pump


Hello,
    A while ago I purchased a TPI from an 86 camaro to place onto my 70
camaro's 350.  I am going to be getting around to installing it soon and I
am not sure what to do about a fuel pump.  I know the preferred way is to
have the pump in-tank but a new tank for my camaro with it in there is
around 500 bucks I think.  What would be the best way to go about this?  Is
an external pump going to be ok as long as my fuel lines are run correctly
or do I need to get a new tank with the internal pump to save lots of grief
later on?

Thanks

Afshin Salehi
70 camaro
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