[DeTomaso] Fuel Pump Question

[Thomas Tornblom]

MikeLDrew at aol.com skrev:
> In a message dated 7/13/07 6:53:03 PM, artstephens at charter.net writes:
> 
> 
>> If I am
>> using fuel faster than the system is providing it,  could my gauge still be
>> showing full pressure until the bowl actually empties? 
>>
> 
> Absolutely.   Pressure and volume normally have an inverse relationship.   A 
> pump pushing against a restrictive pipe will generate a higher pressure, but a 
> lower volume, than the same pump trying to move fluid through a 
> larger-diameter pipe, which would have less resistance, and thus lower pressure, but higher 
> volume.   You could put a cork in your fuel line, and have high pressure and 
> zero volume.

If the gauge is tee'd in at the carb, then as long as your gauge is 
showing adequate pressure, the pump is keeping up with demand.

It can only show full pressure and not providing adequate flow if there 
is a restriction downstream of the gauge connection.

Thomas


> 
> And your carburetor runs out of volume, not pressure.
> 
> The ambition is to have a pump that is capable of generating adequate 
> pressure while delivering the appropriate volume.   Excessively high pressure 
> overpowers the internals in the carburetor, which is why the goal is normally 6 psi 
> or so for Holley-type carbs, and lower (3-4 psi?   I think?) for Webers.
> 
> Mike
> 
> 
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