CHOOS­ING PUMPS

NZ Performance Car - - In­side Line -

A surge tank needs to be con­stantly full to avoid surg­ing. A com­mon cal­cu­la­tion used to se­lect the lift pump is en­sur­ing that it flows at least half the flow rate of the main pump or pumps. We are us­ing twin Bosch 044s as main pumps, which move 200 litres an hour each at 72psi. Feed­ing these will be a sin­gle Carter Black feed pump, which flows a mas­sive 378 litres an hour at a much lower 15psi, so we are well cov­ered.

Added fill­ing capacity will come from plumb­ing the re­turn line from the reg. back into the surge tank. When you plumb the sys­tem this way, you will also need to have a re­turn line from the surge to the main tank, so, once the surge is full, the reg. can still do its job and reg­u­late the fuel pres­sure in the rail.

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