Bypass fuel pressure regulator systems

[1320racer]

My fuel system is all John's aka Product Engineering. Again absolutely NO change, no improvement, no difference. Save your $.

[nhramnl]

Thanks to everyone for their responses. Based on 1320racer's comments and photograph, I have to ask if you had a fuel pressure-based problem when you decided to put the bypass kit on? It looks from the picture that you're using -8 line into the regulator and either -6 or -8 out. Does the car use a QuadraJet, or a 4GC? I guess the key question is, were you hoping to cure a problem and the bypass didn't help (i.e. you still have the problem), were OK but put the bypass system on to guarantee you wouldn't ever have a problem, or put the bypass system on because you were assured that it would pick the car up? Thanks in advance for your answer.

[JHeath]

1320 racer is an expert, even though he doesn't race a super stock car.

[1320racer]

Actually I do.

My car is a former super stocker built by the best, MPR, that now has a 900+HP BBC bracket engine under the hood that accelerates it well into the 8's and it's a safe bet I've made more passes down a 1/4 mile than most class racers over the past 25 years.

Back to the OP's question... -8 in and -8 out feeding a Holley 850. Just had the bypass kit laying around for years so I finally decided to put it on.

[JHeath]

Key word is..."former super stocker" ,but you are not a class racer, as usual, your opinion is irrelevent.

[1320racer]

says the guy who barely runs in the 10s

[Ed Wright]

1320 is correct. Won't hurt, but won't run any faster unless it had fuel supply issues before changing to the bypass set up. Adequate fuel in the bowls is all the carb cares about.

[nhramnl]

Again, thanks to all. I'm running a Q-jet combination and spoke with John Rademacher about the bypass setup when I sent the car's Product Engineering pump back for a rebuild. John's contention is that because of the Q-jet's very small fuel bowl, the bypass system is critical, since it assures a consistent supply of fuel. I don't believe I had a problem before, so I'm not really expecting a major gain, but I was curious if any of you guys that installed the kit (even with a good performing existing system) saw anything.

[buzzinhalfdozen]

Originally Posted by Ed Wright

1320 is correct. Won't hurt, but won't run any faster unless it had fuel supply issues before changing to the bypass set up. Adequate fuel in the bowls is all the carb cares about.

This covers it, "unless it had a fuel supply issue".In a later post the OP stated he had "beer foam" at the carb, seems that would indicate a problem. Seeing as you already purchased the regulator why not just install it and see if it clears up your issue? As you stated not every car is the same, nor does every car respond the same to changes. Good luck on what ever you decide and please let us know what you find out. Joe

[Sean Marconette]

The advantage of a bypass regulator it does not dead head the pump, like a non-bypass. Fuel is moving thru the pump at a constant volume with a bypass. This allows fuel to cool the pump. Dead heading is a low flow/no flow condition.

If you have a low pressure/volume pump like a Holley blue pump, a bypass would not be a benefit to pump life. If you have a high pressure/volume pump that is capable of being used on a FI system, a bypass will extend the life of the pump, and not dead head it. Most of the time a race car is idling around the pits, a very short amount of time is the engine at WOT. The needle and seat are the governing factor in fluid volume and how much cooling effect on the pump in a carb application.