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 > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 10-01-2014, 02:56 PM   #1
mckustomfab
Registered User
 
Join Date: Oct 2011
Location: Carrollton, Tx
Posts: 49
40gal Suburban fuel tank install.

So i will start by saying that this may not be right, or even the best way, but this is how i mounted my 40gal suburban tank. And also this is my first attempt at a wright up so I apologize if its a bit scattered.

Starting with my 1991 R/V Crewcab conversion LWB, I removed the passenger side rear shock mount because it will be in the way of the tank. I then moved the rear crossmember as far back as possible and added a piece of steel to give the tank a little more to rest on. You can see from the pic how far back I moved the crossmember.



Then i held the tank up with a floor jack and go it level to see what i would have to do for the support that the front of the tank would rest on. Worked out that 2" square tubing sat the tank almost perfectly level, so i drilled and welded some sleeves in the 2" square and bolted it in.


To secure the straps i used a piece of angle iron running across the frame rail , I mounted mine close to the tank to make installing the tank less of a hassle.

I hooked up the straps and tightened it down. For clearance here is a pic of tank to rear diff cover clearance.


I will have to take a small section out of one of the ribs running under the bed floor. This is because the top of the tank humps up and the fill breather tub might make contact.


My plan for the fuel door is all based on speculation right now because i have not started on it and I am 8000mi away. But i plan to move the fuel door to behind the rear wheel well like it would be on a suburban. I don't foresee any problems with this but I will have to check when i set the bed back on. I also completely bypassed the switching valve switch and wired the pump into what would have been the passenger side tank. Everything seems to work good but i have to finish my outboard shock mounts before i can cruze around with it. For now it sits like this until the middle of October.


I'm excited to try it out but less so at the thought of spending about $130 bucks to fill it up!
__________________
1991 Chevy Crew Cab R3500 to V3500 Conversion Project:
Build Thread
Photo Bucket Pics
You cant fix stupid, and stupid hurt! Rules to live by.
mckustomfab is offline   Reply With Quote
Old 10-02-2014, 03:44 PM   #2
kevinr1970
Senior Member
 
Join Date: Aug 2004
Location: Everett, WA
Posts: 2,315
Re: 40gal Suburban fuel tank install.

Cool, thanks for writing this up!
I was planning on doing something similar to my '91 2wd, but was thinking using a Blazer tank might be a better alternative fit wise; but I am also planning a making it a shortbed too.
I have a '91 Suburban to use for parts though, so it might just be easier to use whatever is under the Suburban!
__________________
2009 Honda Fit CfC (bsf 44.9 mpg)
2000 Tahoe Limited
1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below
1991 GMC CrewCab Dually 4x4, just going to fix things up for now
1982/1989 K5/GMC Jimmy 2wd
1987 GMC 1/2 ton swb 2wd Crew (sold)
kevinr1970 is offline   Reply With Quote
Old 10-02-2014, 10:47 PM   #3
mckustomfab
Registered User
 
Join Date: Oct 2011
Location: Carrollton, Tx
Posts: 49
Re: 40gal Suburban fuel tank install.

For a short bed a 25gal blazer tank should fit and maybe even a 31gal suburban tank. If you have a parts suburban i would use everything you can, rear crossmember etc. I had cut up a 2wd crew cab so i had a some of those parts laying around so Just used them! Good luck and let me know how it goes!
__________________
1991 Chevy Crew Cab R3500 to V3500 Conversion Project:
Build Thread
Photo Bucket Pics
You cant fix stupid, and stupid hurt! Rules to live by.
mckustomfab is offline   Reply With Quote
Old 12-18-2014, 02:45 AM   #4
K20chevy
Registered User
 
K20chevy's Avatar
 
Join Date: Oct 2012
Location: Pittsfield, ME
Posts: 474
Re: 40gal Suburban fuel tank install.

Quote:
Originally Posted by mckustomfab View Post
So i will start by saying that this may not be right, or even the best way, but this is how i mounted my 40gal suburban tank. And also this is my first attempt at a wright up so I apologize if its a bit scattered.

Starting with my 1991 R/V Crewcab conversion LWB, I removed the passenger side rear shock mount because it will be in the way of the tank. I then moved the rear crossmember as far back as possible and added a piece of steel to give the tank a little more to rest on. You can see from the pic how far back I moved the crossmember.



Then i held the tank up with a floor jack and go it level to see what i would have to do for the support that the front of the tank would rest on. Worked out that 2" square tubing sat the tank almost perfectly level, so i drilled and welded some sleeves in the 2" square and bolted it in.


To secure the straps i used a piece of angle iron running across the frame rail , I mounted mine close to the tank to make installing the tank less of a hassle.

I hooked up the straps and tightened it down. For clearance here is a pic of tank to rear diff cover clearance.


I will have to take a small section out of one of the ribs running under the bed floor. This is because the top of the tank humps up and the fill breather tub might make contact.


My plan for the fuel door is all based on speculation right now because i have not started on it and I am 8000mi away. But i plan to move the fuel door to behind the rear wheel well like it would be on a suburban. I don't foresee any problems with this but I will have to check when i set the bed back on. I also completely bypassed the switching valve switch and wired the pump into what would have been the passenger side tank. Everything seems to work good but i have to finish my outboard shock mounts before i can cruze around with it. For now it sits like this until the middle of October.


I'm excited to try it out but less so at the thought of spending about $130 bucks to fill it up!
I did a similar thing on mine by relocating the factory crossmembers foward and back. The rear crossmember looks just like yours is set up. I havenīt gottenaround to put my hitch in yet. Since one of your pics shows the hitch mocked up, do youhave a few more pictures on how the hitch clears?

I have a custom 45 gal tank in the back but Iīm affraid that the hitch will not clear it when the first mounting hole needs to go in front of the two bolts holding the bottom of the crossmember in place.

Were you able to reuse factory holes in the frame for the hitch or did you have to drill all of them yourself? Does your hitch use 4 bolts per side???

Thanks for any info you can give me!
__________________
78 Chevy K20 Custom Deluxe, build: http://67-72chevytrucks.com/vboard/s...d.php?t=612104

68 Chevy K20 Panel truck, build: http://67-72chevytrucks.com/vboard/s...41#post7263441
K20chevy is offline   Reply With Quote
Old 12-18-2014, 10:08 AM   #5
mckustomfab
Registered User
 
Join Date: Oct 2011
Location: Carrollton, Tx
Posts: 49
Re: 40gal Suburban fuel tank install.

Quote:
I did a similar thing on mine by relocating the factory crossmembers foward and back. The rear crossmember looks just like yours is set up. I havenīt gottenaround to put my hitch in yet. Since one of your pics shows the hitch mocked up, do youhave a few more pictures on how the hitch clears?

I have a custom 45 gal tank in the back but Iīm affraid that the hitch will not clear it when the first mounting hole needs to go in front of the two bolts holding the bottom of the crossmember in place.

Were you able to reuse factory holes in the frame for the hitch or did you have to drill all of them yourself? Does your hitch use 4 bolts per side???

Thanks for any info you can give me!
I had to clearance for the two crossmember bolts and i also had to drill new holes. The hitch i used is a class 4 and i got it used for cheap and i think it was off a 3/4ton truck so that may be part of the reason, but im not 100% sure.

I will grab some pics when i get home around xmas but the flange around the tank is close to the body of the hitch but it clears.
__________________
1991 Chevy Crew Cab R3500 to V3500 Conversion Project:
Build Thread
Photo Bucket Pics
You cant fix stupid, and stupid hurt! Rules to live by.
mckustomfab is offline   Reply With Quote
Old 12-18-2014, 11:27 AM   #6
K20chevy
Registered User
 
K20chevy's Avatar
 
Join Date: Oct 2012
Location: Pittsfield, ME
Posts: 474
Re: 40gal Suburban fuel tank install.

Quote:
Originally Posted by mckustomfab View Post
I had to clearance for the two crossmember bolts and i also had to drill new holes. The hitch i used is a class 4 and i got it used for cheap and i think it was off a 3/4ton truck so that may be part of the reason, but im not 100% sure.

I will grab some pics when i get home around xmas but the flange around the tank is close to the body of the hitch but it clears.
Thank you, any pics would be great. Mine is a class V hitch. I thought I might have to clearance for the bolts of the crossmember.

Thanks for the info! Looking forward to the pics!
__________________
78 Chevy K20 Custom Deluxe, build: http://67-72chevytrucks.com/vboard/s...d.php?t=612104

68 Chevy K20 Panel truck, build: http://67-72chevytrucks.com/vboard/s...41#post7263441
K20chevy is offline   Reply With Quote
Old 01-10-2015, 01:08 PM   #7
mckustomfab
Registered User
 
Join Date: Oct 2011
Location: Carrollton, Tx
Posts: 49
Re: 40gal Suburban fuel tank install.

Sorry for the delay been busy around here.

Here is a pic of the gap between the tank and receiver. It's close buy it clears. I had to clearance the corners of the receiver to clear the tank crossmember bolts.


Here is my amateur attempt at body work. I moved the fuel door to work with my suburban tank, now I have to modify a fill neck to work with it.
__________________
1991 Chevy Crew Cab R3500 to V3500 Conversion Project:
Build Thread
Photo Bucket Pics
You cant fix stupid, and stupid hurt! Rules to live by.
mckustomfab is offline   Reply With Quote
Old 01-10-2015, 03:03 PM   #8
slotard
Registered User
 
Join Date: Nov 2014
Location: Alameda, CA
Posts: 877
Re: 40gal Suburban fuel tank install.

What're the dimension differences between the 25, 31, and 40 gallon tanks? Does it hang down much below the frame? My C20 only has a single tank on it, below the passenger side, and I'd like to swap it out for something a little bigger, farther back would be nice too.
__________________
1973 C20, 350/350
slotard is offline   Reply With Quote
Old 01-10-2015, 09:13 PM   #9
mckustomfab
Registered User
 
Join Date: Oct 2011
Location: Carrollton, Tx
Posts: 49
Re: 40gal Suburban fuel tank install.

Here is the info I used. For a long bed 2wd I would not go with the 40gal tank just because you may have clearance problems between the tank and the diff. a 31should be fine though.

__________________
1991 Chevy Crew Cab R3500 to V3500 Conversion Project:
Build Thread
Photo Bucket Pics
You cant fix stupid, and stupid hurt! Rules to live by.
mckustomfab is offline   Reply With Quote
Old 01-10-2015, 10:31 PM   #10
chevy-fun
Registered User
 
chevy-fun's Avatar
 
Join Date: Jun 2011
Location: Arlington, Tx
Posts: 339
Re: 40gal Suburban fuel tank install.

Looks good. Got a ? If i want to use the 25gal tank for rear an have a ls swap. Which tank should i get. An 87+ burban. Those had the baffels an pump for 60psi correct?
chevy-fun is offline   Reply With Quote
Old 01-11-2015, 12:03 AM   #11
y5mgisi
Second Chance Program
 
y5mgisi's Avatar
 
Join Date: Jun 2006
Location: Portland, OR
Posts: 2,642
Re: 40gal Suburban fuel tank install.

Chevy-fun, 87+ did have baffles. But you have to get an ep381 or equivalent fuel pump. The stock ones in the 87-95 TBI do not supply enough pressure.
__________________
90 Chevy Suburban 2500 5.3 swap/th400/np241/14bltSF/10blt.
77 C20 crew cab Silverado. 396/th400. In work.
y5mgisi is offline   Reply With Quote
Old 01-11-2015, 12:18 AM   #12
mckustomfab
Registered User
 
Join Date: Oct 2011
Location: Carrollton, Tx
Posts: 49
Re: 40gal Suburban fuel tank install.

Quote:
Originally Posted by y5mgisi View Post
Chevy-fun, 87+ did have baffles. But you have to get an ep381 or equivalent fuel pump. The stock ones in the 87-95 TBI do not supply enough pressure.
X2, I would get a tank from a 1991, they should be the same but that is my preference.
__________________
1991 Chevy Crew Cab R3500 to V3500 Conversion Project:
Build Thread
Photo Bucket Pics
You cant fix stupid, and stupid hurt! Rules to live by.
mckustomfab is offline   Reply With Quote
Old 01-11-2015, 02:14 AM   #13
chevy-fun
Registered User
 
chevy-fun's Avatar
 
Join Date: Jun 2011
Location: Arlington, Tx
Posts: 339
Re: 40gal Suburban fuel tank install.

Thanx for info
chevy-fun is offline   Reply With Quote
Old 02-09-2015, 03:35 PM   #14
K20chevy
Registered User
 
K20chevy's Avatar
 
Join Date: Oct 2012
Location: Pittsfield, ME
Posts: 474
Re: 40gal Suburban fuel tank install.

Quote:
Originally Posted by mckustomfab View Post
Sorry for the delay been busy around here.

Here is a pic of the gap between the tank and receiver. It's close buy it clears. I had to clearance the corners of the receiver to clear the tank crossmember bolts.


Here is my amateur attempt at body work. I moved the fuel door to work with my suburban tank, now I have to modify a fill neck to work with it.
Than ks!!

Do you have a detail pic of how you mounted the hitch with the rear crossmember bolts "in the way"? Iīd like to see that. Maybe a shot from the bottom up where the hitch meets the frame!?

Thanks!
__________________
78 Chevy K20 Custom Deluxe, build: http://67-72chevytrucks.com/vboard/s...d.php?t=612104

68 Chevy K20 Panel truck, build: http://67-72chevytrucks.com/vboard/s...41#post7263441
K20chevy is offline   Reply With Quote
Old 02-09-2015, 11:22 PM   #15
mckustomfab
Registered User
 
Join Date: Oct 2011
Location: Carrollton, Tx
Posts: 49
Re: 40gal Suburban fuel tank install.

Right now I am about 8000 miles away from the truck but when i get back i will get you a pic from below. Until then, this should give you a idea of what i did. Its not the exact same hitch butshould work as a example.

__________________
1991 Chevy Crew Cab R3500 to V3500 Conversion Project:
Build Thread
Photo Bucket Pics
You cant fix stupid, and stupid hurt! Rules to live by.
mckustomfab is offline   Reply With Quote
Old 02-16-2015, 06:29 AM   #16
K20chevy
Registered User
 
K20chevy's Avatar
 
Join Date: Oct 2012
Location: Pittsfield, ME
Posts: 474
Re: 40gal Suburban fuel tank install.

Quote:
Originally Posted by mckustomfab View Post
Right now I am about 8000 miles away from the truck but when i get back i will get you a pic from below. Until then, this should give you a idea of what i did. Its not the exact same hitch butshould work as a example.


Thank, that would be great!!
__________________
78 Chevy K20 Custom Deluxe, build: http://67-72chevytrucks.com/vboard/s...d.php?t=612104

68 Chevy K20 Panel truck, build: http://67-72chevytrucks.com/vboard/s...41#post7263441
K20chevy is offline   Reply With Quote
Old 03-15-2015, 10:23 PM   #17
mckustomfab
Registered User
 
Join Date: Oct 2011
Location: Carrollton, Tx
Posts: 49
Re: 40gal Suburban fuel tank install.

This is the best picture I could get, I notched it just enough to clear the bolts.

__________________
1991 Chevy Crew Cab R3500 to V3500 Conversion Project:
Build Thread
Photo Bucket Pics
You cant fix stupid, and stupid hurt! Rules to live by.
mckustomfab is offline   Reply With Quote
Old 03-16-2015, 09:33 AM   #18
K20chevy
Registered User
 
K20chevy's Avatar
 
Join Date: Oct 2012
Location: Pittsfield, ME
Posts: 474
Re: 40gal Suburban fuel tank install.

Quote:
Originally Posted by mckustomfab View Post
This is the best picture I could get, I notched it just enough to clear the bolts.

perfect, thanks so much. That was exactly what I was looking for! I appreciate it!
__________________
78 Chevy K20 Custom Deluxe, build: http://67-72chevytrucks.com/vboard/s...d.php?t=612104

68 Chevy K20 Panel truck, build: http://67-72chevytrucks.com/vboard/s...41#post7263441
K20chevy is offline   Reply With Quote
Old 03-16-2015, 06:01 PM   #19
mckustomfab
Registered User
 
Join Date: Oct 2011
Location: Carrollton, Tx
Posts: 49
Re: 40gal Suburban fuel tank install.

Quote:
Originally Posted by K20chevy View Post
perfect, thanks so much. That was exactly what I was looking for! I appreciate it!
No problem!
__________________
1991 Chevy Crew Cab R3500 to V3500 Conversion Project:
Build Thread
Photo Bucket Pics
You cant fix stupid, and stupid hurt! Rules to live by.
mckustomfab 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 01:20 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com