look at this pic..got 2 fuel pumps with 12 psi each going in ..what is the pressure coming out ...? 12 psi or 24 psi...?

[IMG]local://upfiles/10419/F08B083F539A4C3F878AEE6719902AD2.jpg[/IMG]

 

i think 16 psi by this logic. add up the incoming diameters (3/8+3/8) and divide the outlet (1/2) by that to get the ratio (2/3) of what's actually being put out. then multiply that by the incoming pressure (24) and it comes out to 16 psi. can anyone verify that?

 

12psi. if each pump makes 12psi, your combined pressure will be 12. even though you have two 3/8" inlets and one .5" outlet, you wont get more pressure, you are just choking the flow. choking the flow will not increase pressure, it will just constrict flow

 

the answer is 84kpa, 12psi. it doesnt double.

 

wait i was thinking about this again. if the incoming pressure is gonna stay a constant 12, but it has to fit in a smaller hole, then the pressure has to increase to fit it through doesnt it? cause the fuel isnt gonna back up, its gonna keep coming at 12psi

 

12psi

 

12psi

 

the pressure will exceed 12 PSI in the smaller tubes and therefore the larger tube will exceed 12 PSI as well.

 

it would still be 12 psi. The two pumps would be capable of more GPM than 1 pump.

 

still 12 psi