Fuel system return line question
#1475135
07/27/13 11:03 PM
07/27/13 11:03 PM
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Joined: Mar 2004
Posts: 314 Medina, OH
dart440_72
OP
enthusiast
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OP
enthusiast
Joined: Mar 2004
Posts: 314
Medina, OH
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Hello all,
I am gathering the supplies to change out my BG280 to a Holly Dominator fuel pump. I have never run a return style system. I will be using -10 for the feed, is it ok to run -8 for return?
Thanks
72 Dart 500" low deck Indy SR heads. 10.40 @129 best so far
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Re: Fuel system return line question
[Re: RBDuster]
#1475137
07/28/13 02:22 AM
07/28/13 02:22 AM
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Joined: Nov 2009
Posts: 3,082 St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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With my BG 240 , they recommend a -8 feed and -10 return. Who am I to question why ? That's what I did. It sort of makes sense , as the -8 should be able to supply plenty of volume for a small block single carb deal like mine and the return will not provide any restriction.....so I guess on paper , it's all good. The manufacturer should be able to provide requirements for their stuff I bet.
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Re: Fuel system return line question
[Re: tubtar]
#1475138
07/28/13 03:04 AM
07/28/13 03:04 AM
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Joined: Feb 2004
Posts: 4,501 Gainesville,FL
goldmember
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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Quote:
With my BG 240 , they recommend a -8 feed and -10 return. Who am I to question why ? That's what I did. It sort of makes sense , as the -8 should be able to supply plenty of volume for a small block single carb deal like mine and the return will not provide any restriction.....so I guess on paper , it's all good. The manufacturer should be able to provide requirements for their stuff I bet.
I run the same feed as return,less extra fittings and hose to stock. Makes since to me.
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Re: Fuel system return line question
[Re: dart440_72]
#1475139
07/30/13 10:20 AM
07/30/13 10:20 AM
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Joined: Jan 2003
Posts: 13,376 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,376
Marion, South Carolina [><]
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Aeromotive A1000 pump on my cuda w/ a -10 feed and -8 return. Heard the same things you have and was concerned my -8 wouldn't work...called Aeromotive and the tech guy said it'd work no problem. That was almost 4 years ago.
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: Fuel system return line question
[Re: Crizila]
#1475141
07/30/13 05:03 PM
07/30/13 05:03 PM
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Joined: Aug 2004
Posts: 721 Seminole County FL to Plymouth...
Barry70GTX
super stock
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super stock
Joined: Aug 2004
Posts: 721
Seminole County FL to Plymouth...
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Does the return at the tank need to be above fuel level? I've noticed that low pressure race setups are above and factory high pressure setups are below. Will a low pressure high flow race pump for non fuel injection work with a return in the middle of the tank?
NMCA NSS 67 Coronet
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Re: Fuel system return line question
[Re: Barry70GTX]
#1475142
07/30/13 05:54 PM
07/30/13 05:54 PM
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Joined: Nov 2009
Posts: 3,082 St. Paul , Mn.
tubtar
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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Quote:
Does the return at the tank need to be above fuel level? I've noticed that low pressure race setups are above and factory high pressure setups are below. Will a low pressure high flow race pump for non fuel injection work with a return in the middle of the tank?
With no scientific evidence , I am going to say yes. Plumb it into the filler neck or top of the tank for the same reason as using a larger line. You don't want the back pressure that forcing returned fuel to the tank through 1/2 a tank of fuel would provide. If you're using a cell , there will be a fitting located where ? Yes....on the top. I put mine on the top front on the pass side because that is the side the return runs down. An oval track deal would want a little more thought than that.
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Re: Fuel system return line question
[Re: Barry70GTX]
#1475144
07/30/13 06:07 PM
07/30/13 06:07 PM
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Joined: Jan 2003
Posts: 13,376 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,376
Marion, South Carolina [><]
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Quote:
Does the return at the tank need to be above fuel level? I've noticed that low pressure race setups are above and factory high pressure setups are below. Will a low pressure high flow race pump for non fuel injection work with a return in the middle of the tank?
Mine returns through the factory pickup tube...below fuel level.
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: Fuel system return line question
[Re: an8sec70cuda]
#1475145
07/30/13 07:26 PM
07/30/13 07:26 PM
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Joined: Jan 2003
Posts: 7,131 Amarillo, Texas
BBR
master
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master
Joined: Jan 2003
Posts: 7,131
Amarillo, Texas
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I had a -8 feed and -6 return (which worked fine for an EFI application) and could not get the fuel pressure below 12 psi. Ended up putting a dead head reg between the return reg and the carb to knock it to 6psi. Fuel still circulates and keeps the pump happy.
It's a bandaid, but it works fine and was cheaper than buying all new line and fittings for the return line.
Drag Week 2011 - 77th place - DD Drag Week 2012 - 2nd place SRBB N/A Drag Week 2014 - Kapooya RMRW 2018 RMRW 2020
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Re: Fuel system return line question
[Re: Barry70GTX]
#1475148
08/13/13 01:37 PM
08/13/13 01:37 PM
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Joined: Feb 2003
Posts: 1,942 Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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I meant to reply to this a few weeks ago. I just sumped my tank, didn't want my return to be below fuel level for obvious reasons.
Welded a tube into the filler neck. Hogged out the pressure relief of the cap to make it "vented". works great so far with a BG220 pump. 1/2 SS hardline front to rear.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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