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Reload this Page 55lb injectors on stock fuel pump
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TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

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Old 04-10-2006, 02:39 PM   #1
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55lb injectors on stock fuel pump
If I were to upgrade to the 55lbs injectors on my throttle body...would I need to replace the stock fuel pump as well or would the stock pump be ok?
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Old 04-10-2006, 05:10 PM   #2
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stock pump will be ok
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Old 04-10-2006, 06:29 PM   #3
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????? BTW, stock L03 305 injectors are 55 lb/hr!!!!
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Old 04-11-2006, 12:47 AM   #4
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Color code
Application
Flow rate
Part #
Black/White
1-3/8" bore 2bbl, from 2.8l truck
???
GM 5235430 *RPD
Yellow/Blue
4.3L
???
GM 5235203 *RPD
Green/White
5.0L
40 lb/hr
GM 5235279 *RPD
Orange/Black
5.7L pickup
55 lb/hr
GM 5235206 *RPD
Yellow/Brown
5.7L Cop Car
65 lb/hr
???
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Old 04-11-2006, 01:02 AM   #5
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That chart is somewhat out-dated. The STOCK injectors in the 305 TBI that I pulled off of a 305 truck were 55 lb/hr on a flowbench. Stock 350s are 61 lb/hr.

2.8 = 36 lb/hr
4.3 = 46 lb/hr
5.0 = 55 lb/hr
5.7 = 61 lb/hr
5.7 High Flow = 68 lb/hr
5.7 Vortec Van = 74 lb/hr
7.4 = Various ratings depending on year/application
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Old 04-12-2006, 01:22 AM   #6
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Before I did the 350 vortec swap on my 92 RS w/305, it had 5235279 on the injectors. Anyone else TBI land w/stock 305 have the same injectors?
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Old 04-13-2006, 09:11 PM   #7
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Mine have that number on the injectors, as well as the green and white paint as mentioned above.
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Old 12-05-2008, 06:19 PM   #8
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Re: 55lb injectors on stock fuel pump
i have new ones in my firebird and they have a red top on one side it says
RI279 and on the other side it says 7124? i have no idead what thats telling me?
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Old 12-07-2008, 04:21 PM   #9
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Re: 55lb injectors on stock fuel pump
I have a bunch of 5206, 4304, 5231 injectors and have had them all flow tested, etc.

5235206 typically flow at 650cc/min to 700cc/min @ 1bar which is 14.7 psi. This means that a 5206 (stock 5.7L) injector ranges in the low 60's for lb/hr.

Increasing fuel pressure (if pump can handle it) will increase flow rate and HP. Most stock fuel pumps dont do well about 14-15psi especially at WOT, etc.

I have some 5235206 injectors that flow at 720cc/min @ 14.7psi

So.....
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Old 12-07-2008, 04:21 PM
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Reload this Page 55lb injectors on stock fuel pump
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