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Author
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Topic: Fuel test. I got .528(US gal) in 30 sec.
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70coupe
Gearhead Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 11-20-2002 02:57 PM
  
I performed a fuel test on my fuel system. I came up with .528 US gallons in 30 seconds. I should be up around 1 gallon in 30 seconds.
Maybe thats why the car is lying down top end. I have a 3/8" line but there are some bends which will decrease the size. I think I'm going to put in 1/2" steel braided line from tank to carb.
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 11-20-2002 03:15 PM
You are correct. You need 1 full gallon in 30 seconds MINIMALLY! 
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 11-20-2002 03:15 PM
You are correct. You need 1 full gallon in 30 seconds MINIMALLY! ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
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kid vishus
Gearhead Posts: 4538
From: middle of NC
Registered: Oct 2000
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posted 11-20-2002 03:56 PM
You should see the firehose effect I get if I take a hose off the carb and let it free flow.  That very well could be your problem. What pump are you using now?
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70coupe
Gearhead Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 11-20-2002 04:07 PM
Holley blue with the regulator set to 7 1/2 psi.My lines are 3/8 steel but I noticed some of the bends are as thin as 5/16. I will try the same pump with -8 steel braided fuel lines??
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kid vishus
Gearhead Posts: 4538
From: middle of NC
Registered: Oct 2000
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posted 11-20-2002 04:12 PM
You're not out anything by using the same pump with the bigger line. The bigger line may take care of the problem for now. I would try that first. I never had much luck with the blue pumps. They either leaked like a pasta strainer, or didnt flow enough singley to keep up. I used 2 side by side into a y block then into 1/2" aluminum line for a couple of yrs. That seemed to work ok. Once I got down to around 11.60's, one pump wouldnt keep up anymore.
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 11-20-2002 04:39 PM
I also could never get one single Holley blue pump to deliver one gallon of fuel in under a minute. Even with a 1/2 inch line it would just barely make it in 28 seconds or so.
I wound up as KV, with 2 of them run in series eventually and kept it that way until I went to the big HD killer billet stuff in 1999. ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
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70coupe
Gearhead Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 11-20-2002 05:21 PM
Well, it looks like 1/2" is the way to go for now. My car runs high 11's so I should be getting proper fuel for my set up. Maybe down the road I can add a nice pump to replace the holley blue.
Thanks,
Brian
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bluestreek
Gearhead Posts: 1289
From: Athens,GA
Registered: Jul 2001
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posted 11-20-2002 05:41 PM
Considering that if you run 1/4 mile in about 10 seconds at the strip, then it would take 40 seconds to do 1 mile. And if you need 1 gallon every 30 seconds, That comes out to 3/4 mpg. ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, ported TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi, BFG Drag radials..
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clevelandstyle
Gearhead Posts: 638
From: Connersville, IN
Registered: Jul 2001
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posted 11-20-2002 09:43 PM
Another thing to think about is the fuel filter. I have one of those real "popular" Fram filters. (FRM-HPG1) They only have a free flow of 90gph. The Holley blue pump is supposed to free flow 110gph. The filter is the restriction. I'm going to ugrade my filter and maybe use a Mallory pump this winter. ------------------
Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 351C 4V
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jsracingbbf
Gearhead Posts: 1677
From: Batesville,MS. , U.S.A.
Registered: Mar 2002
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posted 11-20-2002 10:07 PM
I used to have one of these pumps before I switched to mechanical fuel injection. They used to have a pretty good product.
http://www.weldonracing.com/ ------------------
Jerry Smith
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
"Even a blind Hog can find an acorn every now and then"
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