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#1
07-31-2007, 05:39 PM
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fuel flow question
no point in going to -08 or 10 lines if my fuel pump and regulator use 3/8NPT fittings correct??
its just going to choke it down soon as it runs into the pump and regulator,,,,, i would need to move up to 1/2NPT fuel pump and regulators... correct? thanks |
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#2
07-31-2007, 06:15 PM
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Use the big hose, the inlet/outlet ports are a very small restriction. If a restriction is kept very short it will not cause much problem, especially on the high pressure side.
My 3/8'' inlet/outlet/reg. ports flow more than enough fuel for my 462 (i use 1/2'' S.S. hardline for the whole system).
__________________
Derek B. Current best: 11.97@110 1.65-60' !!! '74 ventura,  (Fired july 14/06) '74 462 4-bolt (9.5-1), SCAT, Ross, T-II w/850DP (shaker455), TH350, Conti 10'' 3800, Supercomps, Magnaflow, 3'' Pypes, 3.73's, 28x13.5-15 ET streets.1970 Beismeyer 17' flatbottom vdrive, 11.8:1 455P, ported heads, dual Qjet tunnel ram. 
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#3
07-31-2007, 06:22 PM
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Not true they will not choke it much if at all. The comp 140 pump and regulator come with 3/8 npt fittings and they recommend 1/2 in line. Also when i bought my gas tank sump it came with 1/2 npt and it was way bigger than 1/2. so go with the 3/8 npt
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#4
07-31-2007, 06:27 PM
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NPT threads are large because the pipe is measured by the inside diameter, Tubing and AN are measured by outside diameter.
__________________
Derek B. Current best: 11.97@110 1.65-60' !!! '74 ventura, (Fired july 14/06) '74 462 4-bolt (9.5-1), SCAT, Ross, T-II w/850DP (shaker455), TH350, Conti 10'' 3800, Supercomps, Magnaflow, 3'' Pypes, 3.73's, 28x13.5-15 ET streets.1970 Beismeyer 17' flatbottom vdrive, 11.8:1 455P, ported heads, dual Qjet tunnel ram.
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#5
07-31-2007, 06:50 PM
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ok,, thanks,,,, one more thing,,, i researched this race forum regarding return line size and most people said that the return line should be the SAME size or ONE SIZE BIGGER,,
my No2 1gal fuel cell arrived today and it uses a -08AN fuel outlet and 06AN return,,,,,,,,, whats with this conflicting info.. thanks |
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#6
07-31-2007, 07:37 PM
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You should use a return as big or bigger to prevent restriction on the return side, for some reason most products have a return one size smaller.
__________________
Derek B. Current best: 11.97@110 1.65-60' !!! '74 ventura, (Fired july 14/06) '74 462 4-bolt (9.5-1), SCAT, Ross, T-II w/850DP (shaker455), TH350, Conti 10'' 3800, Supercomps, Magnaflow, 3'' Pypes, 3.73's, 28x13.5-15 ET streets.1970 Beismeyer 17' flatbottom vdrive, 11.8:1 455P, ported heads, dual Qjet tunnel ram.
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#7
07-31-2007, 08:15 PM
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my return is same size. seems ok to me
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#8
08-01-2007, 12:24 AM
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Check your free flow, you need a minimum of 1/2 gallon in 15 seconds. JD
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Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride! 
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