TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

TBI Fuel pressure

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Old Jun 18, 2004 | 07:35 PM
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90_WS6_Formula's Avatar
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Car: 91 Z28
Engine: L98
Transmission: 700R4
TBI Fuel pressure

I checked my fuel pressure on the outlet side of the fuel filter and I got 12psi. Is this OK or a little weak?
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Old Jun 18, 2004 | 10:20 PM
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25THRSS's Avatar
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From: Glen Allen, VA
Perfectly fine. It doesn't seem that the factory had a "set" pressure, but they range from 9-13 psi I believe. 12 is pretty good.
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Old Jun 19, 2004 | 01:53 PM
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90_WS6_Formula's Avatar
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Car: 91 Z28
Engine: L98
Transmission: 700R4
I'm assuming this is the factory fuel pump?
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Old Jun 20, 2004 | 12:48 PM
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by 90_WS6_Formula
I'm assuming this is the factory fuel pump?
Yup that is the stock pump and it is running fine. An aftermarket pump will be much higher and upwards of 22 to 70 psi.
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