What size fuel line?

impstocker · 04-26-2015, 08:57 AM

For my 396/325 Chevy would a 3/8 - 6AN be good or 1/2 8AN ? Have a 300-400 GPH pump I bought years ago from a retiring Pro Stock truck racer. I used in my 68 Impala with same combination. Can't remember what size line I used.

Will Lamprecht
I/SA 65 Impala in progress

race watcher · 04-26-2015, 09:03 AM

Minimum #8 from pump to front.

impstocker · 04-26-2015, 09:38 AM

Thanks RW OK 1/2" would 5/8" then be too much?

Will

Lee Valentine · 04-26-2015, 10:14 AM

At least#8 would use#10,with a return system,I've seen something with a Q-jet using a return line.Lee.

impstocker · 04-26-2015, 01:19 PM

Thanks Lee- Yes I am going with the #8 and I do run a return line with my pimp. I am a Div 1 NED racers too, hope to see you real soon!

Will Lamprecht

Lee Valentine · 04-26-2015, 03:15 PM

Will I keep my race cars in Billings,go through Wingdale often.

Dick Butler · 04-26-2015, 03:18 PM

Note that the return line must be really big to not increase the fuel pressure at the carb. If you find the pressure cannot be decreased to below where you want to run it as a test while idling the pressure is return line resistance..not pump pressure. We used copper gas line 1/2 diameter as return line or pressure at carb too high for Q JET. They seem to like 6.5 to 7 area

04-26-2015, 09:03 AM	#2
race watcher Junior Member Join Date: Nov 2006 Posts: 50 Likes: 5 Liked 1 Time in 1 Post	Re: What size fuel line? Minimum #8 from pump to front.

04-26-2015, 09:38 AM	#3
impstocker Member Join Date: Dec 2008 Location: Wingdale, NY Posts: 302 Likes: 27 Liked 54 Times in 16 Posts	Re: What size fuel line? Thanks RW OK 1/2" would 5/8" then be too much? Will

04-26-2015, 10:14 AM	#4
Lee Valentine Senior Member Join Date: May 2004 Location: Brookfield, CT Posts: 708 Likes: 13 Liked 322 Times in 68 Posts	Re: What size fuel line? At least#8 would use#10,with a return system,I've seen something with a Q-jet using a return line.Lee. __________________ Lee Valentine 1661 STK

04-26-2015, 01:19 PM	#5
impstocker Member Join Date: Dec 2008 Location: Wingdale, NY Posts: 302 Likes: 27 Liked 54 Times in 16 Posts	Re: What size fuel line? Thanks Lee- Yes I am going with the #8 and I do run a return line with my pimp. I am a Div 1 NED racers too, hope to see you real soon! Will Lamprecht

04-26-2015, 03:15 PM	#6
Lee Valentine Senior Member Join Date: May 2004 Location: Brookfield, CT Posts: 708 Likes: 13 Liked 322 Times in 68 Posts	Re: What size fuel line? Will I keep my race cars in Billings,go through Wingdale often. __________________ Lee Valentine 1661 STK

04-26-2015, 08:57 AM	#1
impstocker Member Join Date: Dec 2008 Location: Wingdale, NY Posts: 302 Likes: 27 Liked 54 Times in 16 Posts	What size fuel line? For my 396/325 Chevy would a 3/8 - 6AN be good or 1/2 8AN ? Have a 300-400 GPH pump I bought years ago from a retiring Pro Stock truck racer. I used in my 68 Impala with same combination. Can't remember what size line I used. Will Lamprecht I/SA 65 Impala in progress

04-26-2015, 03:18 PM	#7
Dick Butler VIP Member Join Date: Oct 2002 Location: Richmond Indiana Posts: 1,197 Likes: 5 Liked 32 Times in 19 Posts	Re: What size fuel line? Note that the return line must be really big to not increase the fuel pressure at the carb. If you find the pressure cannot be decreased to below where you want to run it as a test while idling the pressure is return line resistance..not pump pressure. We used copper gas line 1/2 diameter as return line or pressure at carb too high for Q JET. They seem to like 6.5 to 7 area