Quote:
Originally Posted by Bobo0907
Is it necessary for the return line to go through the swirl pot?
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YES ,or why would the swirl pot stay full of fuel?
technically the return to tank should be smaller dia or have a partial pressure valve on it to help keep the swirl pot full
you can use std in tank pump -instead of low pressure first pump .
If swirl pot is higher than second pump then you do not need the second low pressure pump either .
hp pumps do not like sucking and running dry even for seconds can damage them permantly . that si why your diagram shows LP pumps infront of the HP pump.so they can have the hp pump a distance away from swirl pot and higher if needed due to location problems .