12-26-2019, 04:21 PM | #1 |
Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,612
|
Fuel line
What size of fuel line should I be using on my slightly modified carbureted 350 with an mechanical fuel pump and an under bed gas tank? I am planning on using aluminum fuel line
|
12-26-2019, 05:37 PM | #2 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,657
|
Re: Fuel line
3/8" is what I use...what size is your pickup tube?
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
12-26-2019, 07:48 PM | #3 |
Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,612
|
Re: Fuel line
I’m not sure. It is a Jazz fuel cell. The fitting that comes out of the tube is an AN8 fitting so I am assuming that the pickup tube on the inside is also AN8
|
12-26-2019, 09:20 PM | #4 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,657
|
Re: Fuel line
in the -an size ive only used the -6an..which is about 3/8"
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
12-27-2019, 04:02 PM | #5 |
Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
|
Re: Fuel line
6AN = 3/8"
My opinion is go with 3/8". I thought long and hard about a 5/16" line but there isn't much support for that in fittings etc. Besides in the future if you ever want to upgrade your set.
__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
12-28-2019, 07:49 PM | #6 |
Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,612
|
Re: Fuel line
Sounds like the 3/8 is the way to go. Can I use hard line all the way from the tank to the fuel pump? Or do I need to have a soft line hooked up to the pump to absorb the vibration of the motor?
|
12-28-2019, 07:54 PM | #7 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,657
|
Re: Fuel line
You dont have to use rubber...but I would just because...
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
12-28-2019, 09:43 PM | #8 |
Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
|
Re: Fuel line
Yes use a short rubber piece.
__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
01-06-2020, 02:53 PM | #9 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,947
|
Re: Fuel line
You should have rubber (or some sort of flexible hose) that connects the hard fuel line on the frame to the fuel pump, and also from the tank to the hard fuel line attached to the frame too.
Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
|
||
01-21-2020, 05:11 PM | #10 |
Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,612
|
Re: Fuel line
If I use a 3/8 in stainless line what is the best way to connect a rubber fuel line to it?
|
01-21-2020, 05:45 PM | #11 |
Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
|
Re: Fuel line
You could put a bubble flare at the end and get a stainless crimp clamp for the hose when you slide the hose on, It would look better.
Or you could get an 6AN push lock to 3/8" tube crimp fitting. There are numerous ways. You could get wild and do compression to 6AN:
__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 01-21-2020 at 06:08 PM. |
01-23-2020, 05:55 PM | #12 |
Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,068
|
Re: Fuel line
You could replace your fuel pump with one that has NPT fitting and then you could run -6 all the way from the tank to the fuel pump. And then -6 up to the carb.
|
01-23-2020, 06:08 PM | #13 |
Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,612
|
Re: Fuel line
That's what I have. I don't know if I want to spend that much money. I also would need to get line that will stand up against California Gas.
|
01-27-2020, 07:28 PM | #14 |
Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,612
|
Re: Fuel line
I realized today that my holley fuel pump is leaking from one of its gaskets. What fuel pressure pump do you all recommend for a under the bed fuel tank?
|
01-27-2020, 08:41 PM | #15 |
Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
|
Re: Fuel line
Thought you had a mechanical pump?
__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
01-27-2020, 09:14 PM | #16 |
Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,612
|
Re: Fuel line
It is
|
01-27-2020, 09:22 PM | #17 |
Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,612
|
Re: Fuel line
I’m sorry I think I was looking at the free flow rate instead of the fuel pressure. Some of the pumps have different free flow rates so I was a little confused.
|
01-27-2020, 09:35 PM | #18 |
Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,612
|
Re: Fuel line
Do I need to drain my oil in order to replace my fuel pump.
|
01-28-2020, 08:40 AM | #19 |
Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
|
Re: Fuel line
No not at all.
http://67-72chevytrucks.com/vboard/s...&postcount=492
__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 01-28-2020 at 08:47 AM. |
01-28-2020, 06:00 PM | #20 |
Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,068
|
Re: Fuel line
Don't have to drain the oil. But as you pull the old pump out slip a small screw driver under the push rod to hold it up. Also its easier to install the new pump with the push rod all the way up so have someone bump the engine to rotate the cam.
|
Bookmarks |
|
|