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Fuel Rail

tomtom123

tomtom123

New member
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This cars fuel rail. The engine came out of a 2004 Chevy Impala SS Indy 500 Edition. My 1999 GTP engines fuel rail doesn't have that little circle thing left of the Boost Bypass Actuator. What is that and what does it do?

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Alright thanks! I was just curious if it would affect the tuning or anything. But if it doesn't change anything, then I am content with that

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tomtom123 said:
Alright thanks! I was just curious if it would affect the tuning or anything. But if it doesn't change anything, then I am content with that

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its a pulsation damper and yes it affects tuning since it reduces the fuel pressure pulsation

GM saw fit to increase the surface area of the dampeners greatly from that design to the L32/26 design but that's due to the worsening of the pulsation effect with the fpr in the tank on a deadhead/returnless system.

the bigger you injectors the more your fp fluctuates as the pop open and closed.

you can see the effects first hand with a mech fp gauge on your damperless rails youll see the needle bounce at idle, its travel will be roughly halved when you do the same test with the dampened rails

consistent fuel pressure means consistent fueling
 
Since my car was a 99 and didn't have that, would it be best to swap my fuel rail onto this engine?

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I guess I just don't understand then. It helps with fuel pressure consistency? That's good, right? But the 1999 GTP had 36# injectors and the 04+ had 33# injectors, iirc. So should I keep these fuel rails and put the 36# injectors in these rails? And I'll have to tune my car to this new damper, right?

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no you will not need to tune specifically for it but the damper will keep fuel pressure fluctuations from affecting fueling which is good
the effect is amplified the bigger the injectors so for big builds dampers can be a great addition
use your injectors with those rails with the damper and you're set
 
and that is technically a series 3 l67 only the Grand Prix got the L 32 that had the stainless fuel logs with the largest fuel rail pulsation dampers and gen5
 
I get the dampening. But non of us who have purchase modified fuel rail or even billet fuel rails have this. So it's good to have but I've never heard of a push to add this before. Am I missing something.
 
these are the pulsation dampers inside the l32 rails. you grind off the weld opposite the brazed end and knock out the plug that remains... they are sized for dash 6 rails id...but I install them in dash 8 dash 10 Fatman rails by modifying them.
 


So the engine I picked up was a L67 with the Series 3 3800 that just has a Gen 3? Which in Grand Prixs is actually the Series 3 3800 with a Gen 5?

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Right. I know what year they switched for Grand Prix's. Just didn't know about the other GM cars, such as the 2004 Impala

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