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

Checkin Fuel Pressure

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Old Jul 10, 2006 | 11:01 PM
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Blktalon456's Avatar
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From: Brown Summit, NC
Car: 1992 Chevrolet Camaro RS
Engine: 305 TBI
Transmission: T5 5 Speed
Axle/Gears: 3.08 LS
Checkin Fuel Pressure

On a 92 305 TBI does it have a schrader valve to check fuel pressure or is there no way to check it. Any info will be helpful.
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Old Jul 10, 2006 | 11:17 PM
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Green89IROC305's Avatar
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From: Milford, OH
Car: 91 Z28 - using 87 electricals
Engine: 383 HSR EBL
Transmission: 700R4 - Stage 3 Fixed Pressure
Axle/Gears: GM 3.08 POSI
alls i can say for sure is that there is no scrader valve for testing on the tbi system. unfortuantely i have no idea how to accurately test this system but i am eager to find out for future knowledge.
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Old Jul 10, 2006 | 11:38 PM
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Fast355's Avatar
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally Posted by Green89IROC305
alls i can say for sure is that there is no scrader valve for testing on the tbi system. unfortuantely i have no idea how to accurately test this system but i am eager to find out for future knowledge.
Autozone sells it as Actron part number CP7817. It will be around $39.99. It comes with a 0-60 PSI gauge, and an adapter that screws in the line between the line and the filter.

ActronŽ
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Old Oct 13, 2006 | 01:02 AM
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From: Sacramento
Car: 91 RS
Engine: 350 TBI
Transmission: WC T5
Axle/Gears: 3.42 Posi
I bought that piece. It seems to be very nice quality. Dont try to use the little piece right behind the TBI unit, you will have a hell of a time trying to make that work, especially with gas spilling all around.

Instead go down by the alternater and you will see where the lines go from rubber to metal lines. There is a coupler there that is exact same threads as the schrader valve thing. Put it there. Put it on the thicker line, NOT the return line. I am unsure however if I check for leaks and leave it there always, or just put it in, use it, and remove it every time I need to check my FP. Right now its just left in there, has been for a couple months with no problems so far.
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