Bypass fuel pressure regulator systems

nhramnl · 11-24-2015, 03:51 PM

Has anyone converted their carbureted combination to a bypass system? I'm talking about a system that uses small lines from the pressure regulator that go into a y-block and then back to the fuel cell. If so, it would be great to know what your results were (steadier pressure, additional MPH, ET improvement, or annoying side effects). Thanks.

buzzinhalfdozen · 11-24-2015, 04:35 PM

My car is set up that way, mainly so I can go from EFI to carb. Would think best to confirm with your pump manufacturer to make sure it's up to the task. Can't imagine a down side....except of course the gentleman that had the "breaks up at 4500rpm" issue which was solved. BTW there is only 1 return line on my setup (Aeromotive) no Y blocks involved.

Jeff Stout · 11-24-2015, 05:01 PM

I have the Magna Fuel system on a super stock car. It is a jetted return from reg back to tank. I think a .035 jet into a -4 line to tank. What I noticed with my fuel pressure gauge is that the pressure stayed the same throughout the run with less needle bounce also. Cant say any ET gain.

Alan Nyhus · 11-26-2015, 12:05 PM

When I put the bypass on, the fuel pressure was a bit more stable. Didn't see any performance improvement but the pump is noticeably cooler. Make sure to extend the bypass line in the tank so it's covered by fuel and isn't aerating the fuel in the tank when it dumps back in.

1320racer · 11-27-2015, 09:27 PM

Quote:

Originally Posted by nhramnl

Has anyone converted their carbureted combination to a bypass system? I'm talking about a system that uses small lines from the pressure regulator that go into a y-block and then back to the fuel cell. If so, it would be great to know what your results were (steadier pressure, additional MPH, ET improvement, or annoying side effects). Thanks.

Absolutely no change, no improvement whatsoever.

JHeath · 11-27-2015, 09:35 PM

Mike, call John Rademacher @ Product Engineering, he can explain it better than me.

1320racer · 11-27-2015, 09:51 PM

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

nhramnl · 11-27-2015, 11:45 PM

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 · 11-27-2015, 11:56 PM

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

1320racer · 11-28-2015, 12:01 AM

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.

11-24-2015, 03:51 PM	#1
nhramnl Senior Member Join Date: Feb 2010 Posts: 507 Likes: 8 Liked 358 Times in 83 Posts	Bypass fuel pressure regulator systems Has anyone converted their carbureted combination to a bypass system? I'm talking about a system that uses small lines from the pressure regulator that go into a y-block and then back to the fuel cell. If so, it would be great to know what your results were (steadier pressure, additional MPH, ET improvement, or annoying side effects). Thanks.

11-24-2015, 04:35 PM	#2
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: Bypass fuel pressure regulator systems My car is set up that way, mainly so I can go from EFI to carb. Would think best to confirm with your pump manufacturer to make sure it's up to the task. Can't imagine a down side....except of course the gentleman that had the "breaks up at 4500rpm" issue which was solved. BTW there is only 1 return line on my setup (Aeromotive) no Y blocks involved. __________________ Joe Buchanan SS/BX 3117

11-24-2015, 05:01 PM	#3
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,486 Likes: 66 Liked 704 Times in 281 Posts	Re: Bypass fuel pressure regulator systems I have the Magna Fuel system on a super stock car. It is a jetted return from reg back to tank. I think a .035 jet into a -4 line to tank. What I noticed with my fuel pressure gauge is that the pressure stayed the same throughout the run with less needle bounce also. Cant say any ET gain.

11-26-2015, 12:05 PM	#4
Alan Nyhus VIP Member Join Date: Dec 2002 Location: Lower Dakota territory Posts: 1,180 Likes: 1,074 Liked 799 Times in 236 Posts	Re: Bypass fuel pressure regulator systems When I put the bypass on, the fuel pressure was a bit more stable. Didn't see any performance improvement but the pump is noticeably cooler. Make sure to extend the bypass line in the tank so it's covered by fuel and isn't aerating the fuel in the tank when it dumps back in. __________________ "That'll never work....."

11-27-2015, 09:35 PM	#6
JHeath Senior Member Join Date: Jul 2004 Location: Minneapolis Posts: 786 Likes: 2,876 Liked 370 Times in 101 Posts	Re: Bypass fuel pressure regulator systems Mike, call John Rademacher @ Product Engineering, he can explain it better than me. __________________ Jerry Heath I/S '93 Cobra FS/J 2010 Mustang "Ebay CJ"

11-27-2015, 09:51 PM	#7
1320racer VIP Member Join Date: Nov 2007 Location: New Jersey Posts: 2,628 Likes: 160 Liked 759 Times in 379 Posts	Re: Bypass fuel pressure regulator systems My fuel system is all John's aka Product Engineering. Again absolutely NO change, no improvement, no difference. Save your $. Last edited by 1320racer; 11-27-2015 at 10:06 PM.

11-27-2015, 11:45 PM	#8
nhramnl Senior Member Join Date: Feb 2010 Posts: 507 Likes: 8 Liked 358 Times in 83 Posts	Re: Bypass fuel pressure regulator systems 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.

11-27-2015, 11:56 PM	#9
JHeath Senior Member Join Date: Jul 2004 Location: Minneapolis Posts: 786 Likes: 2,876 Liked 370 Times in 101 Posts	Re: Bypass fuel pressure regulator systems 1320 racer is an expert, even though he doesn't race a super stock car. __________________ Jerry Heath I/S '93 Cobra FS/J 2010 Mustang "Ebay CJ"

11-28-2015, 12:01 AM	#10
1320racer VIP Member Join Date: Nov 2007 Location: New Jersey Posts: 2,628 Likes: 160 Liked 759 Times in 379 Posts	Re: Bypass fuel pressure regulator systems 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. Last edited by 1320racer; 11-28-2015 at 12:21 AM.