Fuel pump questions

[sfg]

Ed wrote:

> In-tank fuel pumps: Since the wiring is also submersed, would there be
> any worry about the + and - wires shorting each other, causing a spark,
> and destroying the fuel tank? (this is my dumb question)
> 
> In-line or "booster" pumps: One person tells me you must run it
> constantly with the main pump, otherwise there will be such a large
> restriction in flow. 
...snip

Ed, I use an inline pump on my K5 Blazer (Mallory 4060FI) along
with the flakey in-tank pump. It now runs better than it ever did,
(even with a good OEM pump). The check valve in the OEM
pump is necessary it seems. Engine stalls with booster off.
As for sparking: I have the same question. 
That's a brush-type motor in the tank! What if 
fuel level is at min, and the motor brushes are exposed? 
Steve