I had my car in for a dyno tune today. On the initial run to check everything was ok it was crazy lean. 15:1 afr!! so the run was backed off. Added a heap more fuel into the higher load points, which then richened it up but the injectors were at 90% duty cycle (380cc injectors car was making 170hp @10psi) My tuner suspects the fuel pump is the problem. We checked the fuel pressure and it wasn't dropping off, but he says he has seen that happen before and it was the fuel pump not flowing enough. There was no point going ahead with the fuel because there simply wasn't enough for 20psi.
Does it sound like a fuel pump to you?
Does it sound like a fuel pump to you?
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