The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-12-2018, 03:38 PM   #1
mattfranklin
Registered User
 
mattfranklin's Avatar
 
Join Date: Dec 2011
Location: Moraga, CA
Posts: 485
Dumb Fuel Hose Question

The stock fuel line for my 1970 C10 is 5/16", but the fuel pump inlet is 3/8".
This is because I'm following the 1970 Corvette/LT-1/Z-28 stock specs for my parts.

I'm kind of a hack sometimes, so I know that I can probably just use a 3/8" hose and crank down on the hose clamp on the 5/16" line end. Or possibly I could stretch a 5/16" hose over the 3/8" pump fitting. Or I could make it ugly and put a double barbed adapter in the middle with one for each type of hose. I think any of those would work, but I'm wondering... Is there an existing molded hose available that would have a proper size for each end? It only needs to be around half a foot long.

Maybe I'm overthinking this and the 3/8" hose would be fine, but I did have an engine fire about 10 years ago so I'm a little gun shy about any risks under the hood.
__________________
(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1

http://67-72chevytrucks.com/vboard/s...d.php?t=567340
mattfranklin is offline   Reply With Quote
Old 06-12-2018, 06:39 PM   #2
GASoline71
"I ain't nobody, dork."
 
GASoline71's Avatar
 
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,395
Re: Dumb Fuel Hose Question

Get the new hard lines that are 3/8" and then use short pieces of 3/8" hose where you need it.

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:
Originally Posted by LONGHAIR View Post
I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
GASoline71 is offline   Reply With Quote
Old 06-13-2018, 11:21 AM   #3
ka_jd7and1
is a fungineer
 
ka_jd7and1's Avatar
 
Join Date: Jan 2009
Location: Bakersfield, CA
Posts: 789
Re: Dumb Fuel Hose Question

If you want to keep the 5/16" hard line, you can also get a 5/16" compression by NPT fitting, and then a NPT X 3/8" hose barb, then run a short 3/8" hose to the pump.
__________________

2003 S10, 2.2 auto- the daily driver, currently with a 2"/2" drop and some minor engine bolt-ons

1978 Impala 2-door, race 350/T350 - the new race car, in progress

1968 Chevy C10 longbed- 3/5 drop, currently undergoing a heart transplant
ka_jd7and1 is offline   Reply With Quote
Old 06-13-2018, 12:45 PM   #4
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 5,233
Re: Dumb Fuel Hose Question

Quote:
Originally Posted by GASoline71 View Post
Get the new hard lines that are 3/8" and then use short pieces of 3/8" hose where you need it.

Gary
What he said, sounds like your truck may have come with a 6cyl originally
kwmech is offline   Reply With Quote
Old 06-13-2018, 01:08 PM   #5
mattfranklin
Registered User
 
mattfranklin's Avatar
 
Join Date: Dec 2011
Location: Moraga, CA
Posts: 485
Re: Dumb Fuel Hose Question

Quote:
Originally Posted by kwmech View Post
What he said, sounds like your truck may have come with a 6cyl originally
Good point. VIN code says 350 4bbl, but who knows what has been changed in the past 48 years by previous owners. Heck, I think I have a '67 gauge cluster in my '70 truck and there is even a wiper switch where the choke was supposed to be or vice versa.
__________________
(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1

http://67-72chevytrucks.com/vboard/s...d.php?t=567340
mattfranklin is offline   Reply With Quote
Old 06-13-2018, 02:10 PM   #6
mattfranklin
Registered User
 
mattfranklin's Avatar
 
Join Date: Dec 2011
Location: Moraga, CA
Posts: 485
Re: Dumb Fuel Hose Question

Great suggestions, everyone. Thanks!

I think in the long run I will track down that 3/8" original style line. InlineTube didn't mention it among their products. It looked like LMC had it in stainless for only the 71/72 trucks. Not sure if that is ok or something will bite me on that.

In the short run I'll run some form of adapter. At least to get it running under its own power.
__________________
(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1

http://67-72chevytrucks.com/vboard/s...d.php?t=567340
mattfranklin is offline   Reply With Quote
Old 06-13-2018, 07:46 PM   #7
GASoline71
"I ain't nobody, dork."
 
GASoline71's Avatar
 
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,395
Re: Dumb Fuel Hose Question

Inline tube has it... I have used them and they are good quality.

Part# CTF6702, 67-70 V8 1/2 & 3/4 ton front to rear 3/8" 2-pc, SS $85, OE STEEL $60

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:
Originally Posted by LONGHAIR View Post
I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
GASoline71 is offline   Reply With Quote
Old 06-14-2018, 01:31 PM   #8
mattfranklin
Registered User
 
mattfranklin's Avatar
 
Join Date: Dec 2011
Location: Moraga, CA
Posts: 485
Re: Dumb Fuel Hose Question

Quote:
Originally Posted by GASoline71 View Post
Inline tube has it... I have used them and they are good quality.

Part# CTF6702, 67-70 V8 1/2 & 3/4 ton front to rear 3/8" 2-pc, SS $85, OE STEEL $60

Gary
Excellent! Thanks!

This looks like regular steel.
https://www.inlinetube.com/_p/prd14/...?q=thunderbird

And the stainless version is...
Available at Classic Industries.
__________________
(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1

http://67-72chevytrucks.com/vboard/s...d.php?t=567340

Last edited by mattfranklin; 06-14-2018 at 03:48 PM.
mattfranklin is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:19 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com