Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: MadMopars]
#2738717
02/01/20 01:16 PM
02/01/20 01:16 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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State of confusion
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Putting a filter directly after the pump is a no no cos the pump is already filtered by the 100 micron pre filter. The 40 or whatever size after filter needs to be close to the carb to catch the fuel line material that slowly breaks down or any crap in general in the system.......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: sixpackgut]
#2738727
02/01/20 01:32 PM
02/01/20 01:32 PM
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Joined: Feb 2014
Posts: 1,707 central il.
second 70
top fuel
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top fuel
Joined: Feb 2014
Posts: 1,707
central il.
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Why does the fuel get hot? Routing or pump stalling? Pump stall is alleviated by the rear bypass or running the pump on a PWM signal. Routing is easy enough to cure. You will see even most OEM's have eliminated tank return. Doug Im sure you realize that efi does not have the same problems as the increased pressure raises the boiling point And Im not sure how many guys here have ever driven their cars for 8 hours straight across states. Yes, it gets somewhat warm in Michigan. I drove my barracuda there, i also drove to TX, LA, OK, MO,KS,TN,OH,AR,IN,IL,KY to name a few Come on Ray you've been here it doesn't get that hot in Illinois. Lol Gateway I believe can be almost as hot as hot can get.
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: BradH]
#2738947
02/02/20 10:51 AM
02/02/20 10:51 AM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
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Posts: 9,225
Charleston
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I'm deaf, blind, overweight, going bald, and turned 60 last year... sounds like the perfect combination of traits for a co-pilot to me. Well, you wouldn't have had to worry about my fuel system
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: AndyF]
#2738983
02/02/20 12:09 PM
02/02/20 12:09 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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The magnaflow setup seems like the best design for the type of application that you are talking about. (assuming a person is still willing to use a carb for a car that is driven a lot) The magnaflow has a return line off the pump so the fuel line to the front of the car is running at 30 psi. 30 psi is high enough that there will not be any issue with vapor lock. Then there is a small non-return style regulator near the carb that drops the pressure to 6 psi. That final length of 6 psi line should be short enough that it doesn't vapor lock. My guess is that type of setup would be able to handle most any type of fuel and weather conditions. MAGNAFUEL and that's what I run and have on the street for many years and yes, even w/a nasty hard to tune carb and it's 1200 cfm to boot. No vapor lock even w/91 pump junk and I even get decent mileage if I cruise on the primaries and funny enuff, so does Ray Meyers who won Drag Week and even got up to 16 mpg's w/that nasty old 1050 Dominator thingy........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: Wirenut]
#2739279
02/03/20 10:40 AM
02/03/20 10:40 AM
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Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
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Im 8 up 10 back to tank with reg after the carb. Mallory 140 with their regulator. Been running this setup on past 2 cars for 15 years. No other way I would do it This is the correct way to do it. Return should be larger than the feed , reg before the carb . This is how mine is done and as prescribed Magna. Aeromotive doesn't agree w/ this. Not saying one is better than the other, just pointing this out. When I designed my system I called them to make sure I was on the right track. They recommended a -10 feed and -8 return. On the street you need the fuel circulating from the carb back to the tank. The short returns from the bigger pumps back at the tank won't work real well on the street. That long stretch of fuel the length of the car needs to circulate to keep it cool.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: an8sec70cuda]
#2739306
02/03/20 11:51 AM
02/03/20 11:51 AM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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Yep, and I tried the return deal on their hot rod pump and it couldn't keep up and went a best of 9.98 then switched to the MAGNAFUEL 300 and went 9.79......
Last edited by Thumperdart; 02/03/20 11:51 AM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: Thumperdart]
#2739311
02/03/20 12:12 PM
02/03/20 12:12 PM
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Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Yep, and I tried the return deal on their hot rod pump and it couldn't keep up and went a best of 9.98 then switched to the MAGNAFUEL 300 and went 9.79...... I don't think the Aeromotive 11203 hot rod/street rod pump flows enough fuel to feed a 9 sec car w/ a return style system. It works fine deadheaded though. I went 9.54 at 140+ mph w/ that pump and a single -8 line deadheaded.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: an8sec70cuda]
#2739336
02/03/20 01:45 PM
02/03/20 01:45 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
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Posts: 15,439
Val-haul-ass... eventually
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Yep, and I tried the return deal on their hot rod pump and it couldn't keep up and went a best of 9.98 then switched to the MAGNAFUEL 300 and went 9.79...... I don't think the Aeromotive 11203 hot rod/street rod pump flows enough fuel to feed a 9 sec car w/ a return style system. It works fine deadheaded though. I went 9.54 at 140+ mph w/ that pump and a single -8 line deadheaded. Not likely my Mallory 140 can support a return setup, either. Guess I'll leave it as it is until I consider a fuel system upgrade in the future.
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: an8sec70cuda]
#2739361
02/03/20 03:13 PM
02/03/20 03:13 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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Agree but it said it supportes x amount of power deadheaded and x amount more iirc returned back to the tank.....
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: Thumperdart]
#2739363
02/03/20 03:28 PM
02/03/20 03:28 PM
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Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
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Agree but it said it supportes x amount of power deadheaded and x amount more iirc returned back to the tank..... Says it supports 750 hp carbureted on gasoline. Don't see anything saying the "horsepower rating" changes whether deadhead or return style. It fed my car just fine, so there's no reason it shouldn't have fed your car easily unless you have a restriction somewhere else in your system...OR, if like I said earlier, a return style system just requires a larger pump to keep up w/ demand.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: Thumperdart]
#2739364
02/03/20 03:32 PM
02/03/20 03:32 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Milwaukee WI
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Just because you have a return style regulator, does not mean you are always returning fuel. I see no reason why a pump that is maxed out on a dead head regulator would not supply the engine with the same amount of fuel with a return style regulator.
"use it 'till it breaks, replace as needed"
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: TRENDZ]
#2739385
02/03/20 05:58 PM
02/03/20 05:58 PM
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Joined: Aug 2011
Posts: 2,861 Pattison Texas
CSK
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Pattison Texas
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Just because you have a return style regulator, does not mean you are always returning fuel. I see no reason why a pump that is maxed out on a dead head regulator would not supply the engine with the same amount of fuel with a return style regulator. If the return regulator stops returning it's because the fuel pressure has dropped below the setting, & that means the pump volume is to low.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: CSK]
#2739399
02/03/20 07:06 PM
02/03/20 07:06 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Milwaukee WI
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Yes. In other words.... maxed out. So regulator style would supply the same amount of fuel to the engine.
"use it 'till it breaks, replace as needed"
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: an8sec70cuda]
#2739415
02/03/20 08:01 PM
02/03/20 08:01 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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I read something that said it would support like 700+ hp deadheaded and like 900 w/a return but I don't remember exactly where I read that and it was years ago..........Hell, maybe I was drunk.....
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: sixpackgut]
#2739437
02/03/20 09:18 PM
02/03/20 09:18 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Eddie Miller went 8.50s in 06 and 7.9x in 08 with 2 holley blue pumps. And one was dangling only held in place by the fuel line
And he was also pumping methanol from an alternative source 😏
"use it 'till it breaks, replace as needed"
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: TRENDZ]
#2739454
02/03/20 09:56 PM
02/03/20 09:56 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Attention in the pits
Fuel pump must have the internal bypass disabled to run bypass regulator
On a mallory 140, there is a screw with jam nut, you remove the pressure spring just like a bb mopar oil pump and put in a solid spacer so the pump is on kill at all times
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: TRENDZ]
#2739455
02/03/20 09:58 PM
02/03/20 09:58 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Eddie Miller went 8.50s in 06 and 7.9x in 08 with 2 holley blue pumps. And one was dangling only held in place by the fuel line
And he was also pumping methanol from an alternative source 😏 No he wasnt. I was his copilot. I dont know where that comes from
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Bypass type fuel systems (Carb)... Thoughts?
[Re: sixpackgut]
#2739528
02/04/20 05:07 AM
02/04/20 05:07 AM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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master
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Milwaukee WI
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I was pitted next to you In 2006. Your windshield washer bottle seemed awfully important to be filled between rounds. “direct port water injection nozzles”😂 I was also the guy that gave you the hose you needed to continue to next round. Don’t worry, I won’t tell anybody.
Last edited by TRENDZ; 02/04/20 06:05 AM.
"use it 'till it breaks, replace as needed"
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