Twin turbine TBI pump (was Suction through a unpowered Tank Pump.)

[Greg Hermann]

>Greg Hermann wrote:
>
>> I have been toying with the idea of using an in-tank mounted marine bilge
>> pump for a primary fuel pump. LOTS of flow,  (36 HUNDRED gallons per hour
>> not a problem) but a stalled flow head of only maybe 5 psig. Pretty easy on
>> the power, as well, at least at low flow rates. Gotta be explosion proof to
>> go into a bilge. Dirt tolerant--so no need for a suction sock that gets
>> dirty and restricts flow, then plugs up. First filter could be in line,
>> between the in tank pump and the vapor separator. At low flow rates
>> (relative to the pump's max flow capacity) the pump curve is VERY flat, so
>> using a primary pressure regulator would be superfluous to the point of
>> being a joke.
>>
>> Any thoughts?? Reasons why not??
>>
>>  Regards, Greg
>> >--
>Not that I know diddly about marine stuff, but what's the fuel
>tolerance like?  This is a part mainly designed for dirty water, no?
>Shannen

Apparently OK. Agreed that it is only occasional, but there is sometimes a
petroleum scum in a lot of bilges.

Mfgrs. say the pumps are "OK to pump fuel, but don't make a habit of it."
Hmmm. I think their comment is mostly, if not entirely a liability
issue--either fuel dissolves pump parts--or it doesn't.

Greg