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 > LSx Swaps

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 10-15-2014, 03:47 PM   #1
rmv23887
Registered User
 
Join Date: Mar 2013
Location: St Johns FL
Posts: 24
LS tank Vent 72C10 LWB

Adapting stock pump to stock (suburban/Blazer) steel tank behind axle. What do I need to do about vent? Have one(vent) on stock tank and one on pump.
Any input?

RandyV
rmv23887 is offline   Reply With Quote
Old 10-15-2014, 04:27 PM   #2
BR3W CITY
meowMEOWmeowMEOW
 
BR3W CITY's Avatar
 
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
Re: LS tank Vent 72C10 LWB

Assuming you mean adapting the sending unit? The pump itself is just the little pump motor, not the whole basket assembly.

Either way really, you've got a few choices;
a) just stick a breather on the vent or run a line to a breather.
b)actually run the vent to a charcoal cannistor/evap (this is the factory config)
c) block it off and run a vented cap.

As long as there is some way to vent pressure, it doesn't really matter how.
__________________
'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING

MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD
BR3W CITY is offline   Reply With Quote
Old 10-20-2014, 09:50 PM   #3
rmv23887
Registered User
 
Join Date: Mar 2013
Location: St Johns FL
Posts: 24
Re: LS tank Vent 72C10 LWB

No, i am modifying tank to accept the stock fuel pump out if donor(2003 Silverado) Tank has a vent pipe, fill neck and a sending unit (including cab fuel pickup) The fuel pump has feed, return and a third connection. I assume the 3rd port is for the canister, i am asking how out to vent, pump or tank vent.
rmv23887 is offline   Reply With Quote
Old 10-21-2014, 03:39 AM   #4
BR3W CITY
meowMEOWmeowMEOW
 
BR3W CITY's Avatar
 
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
Re: LS tank Vent 72C10 LWB

I'm not sure you read my post through.



That whole thing is the pump assembly, the pump itself is only the lower portion, while the upper portion contains the sending unit (the arm) and the 3 ports.

You do not need a vent on the tank AND on the pump assembly. The third port is EVAP. If you re-read my post, it explains your options. You can hookup the EVAP like o.e., or just run a vent or vented cap.

Vehicles that use an external pump (so, not having the whole sending unit assembly) will sometimes have a vent on the tank which will either vent to air through a breather or a charcoal cannistor, or just use a vented cap.

You do not need both, tho they both pretty much serve the same purpose.
__________________
'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING

MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD
BR3W CITY is offline   Reply With Quote
Reply

Bookmarks

Tags
4.8, c10 1972, fuel tank, ls tank

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 02:02 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com