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equality72521 equality72521 is offline
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Join Date: Jul 2006
Location: Brandon, FL
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Originally Posted by ClickClickBoom View Post
Without talking to Dr Porsche, I will bet that the design philosophy is similar to many other 2 pump designs. The first pumpis a delivery pump, high volume, low pressure. The second pump is a pressure delivery pump, high pressure, low volume. The reason you are experiencing the symptoms of quitting when you pull the relays is because the rear pump is not working at spec and unplugging the front kills the supply. The lean running on boost points at reduced high pressure fuel and the resulting lean condition. I would suggest plumbing pressure guages after each pump and check outputs against the FSM for your car.
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Old 02-23-2009, 08:47 AM
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