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The fuel injection system relies on having a certain fuel pressure to work right. It opens the fuel injector for a certain period of time, and the amount of fuel that comes out depends on that time AND fuel pressure. If the fuel pressure is too low, you'll get less fuel. Less fuel means a lean mixture, and lean usually means engine knock. If the APC senses knock, it reduces boost.
As the others have said, suspect your pre-pump. There are two fuel pumps in the tank - one main pump and a pre-pump. The pre-pump's job is to gather fuel at a half tank and below. If the pre-pump is tired, or its screen is clogged, it won't be able to provide sufficient fuel to supply the main pump, and your fuel pressure will be low.
To be sure, you can have your fuel pressure checked when the car is near empty.
Posts in this Thread:
- Can gas level affect turbo performance?, jason, Mon, 11 Jun 2001 13:20:27
- Sure, Ari
, Mon, 11 Jun 2001 15:11:12 <-- Viewing This Message - Definitly a prepump, fix or keep tank full n/m, Bill U, Mon, 11 Jun 2001 13:49:56
- Re: Can gas level affect turbo performance?, KeithG, Mon, 11 Jun 2001 13:24:13
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