A couple questions on a rear tank install on 72 fleetside lwb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jerblazer72 · 04-06-2008, 06:29 AM

Guys, a little help if possible. I am doing a blazer tank install on my 72 gmc lwb and just want to be sure of a couple things before I take the cutting tools to the underside of my truck. In the picture I have 2 arrows. The top points to what is the bottom support of the bed, I think it has to be removed. Am I correct? Also, the bottom arrow points to what I think is the spare tire mounting bracket. I think it has to come out also. Can someone confirm that I am on the right track here?

I am planning on doing the rear marker light install once the tank is installed. Thanks in advance for your comments and insight!

chevydog66 · 04-06-2008, 07:34 AM

I'll be watching this, cause I'm planning on the same for my 72 GMC lwb.

jayharrell · 04-06-2008, 05:03 PM

This i want to see too. Plan on getting mine in pretty soon.
Now i know the spare tire braket has to come out, and my tank is out of a suburban, so the rear cross member has to be moved back about 4 inches.

This i would like to see too.

whatnow123 · 04-06-2008, 05:11 PM

Yes, you are correct, both need to come out. Here is a photo of my tank so you get an idea on how it sits. There are more photos on my build thread link below.

jeffspower · 04-06-2008, 07:36 PM

It looks like you have leaf springs- is it a 4x4? If so, you don't have to hack the whole box crossmember out. Just position the tank forward so the filler ends up in front of it. I'm working on mine today- I'll post pics later.

chevelle · 04-06-2008, 07:46 PM

Ive got one of these tanks in my longbed and yes you have to remove the smaller lower brace, and I just trimmed the bed support for more clearance because mine is lowered, but i dont think you have to

**Classic Heartbeat** · 04-06-2008, 09:08 PM

You will need to notch the bed cross sill just between the frame rails so the fill neck gets above the frame rail. WES

jayharrell · 04-06-2008, 10:46 PM

Now is the notching of the bed support for top clearance of the tank or just for the filler neck??

ratpackv8sonly · 04-06-2008, 11:08 PM

I know on my short bed I didnt have to do anything to the frame to fit my suburban tank but I did have to remove a brace from the bottom of the bed floor so the bed would sit all the way down on the frame. This floor brace landed right on top of the middle of my tank. I have my neck going into the inside fender well with a gas door from an early 80s model chevy. I will post a few pics as soon as I can.

ratpackv8sonly · 04-06-2008, 11:12 PM

http://viewmorepics.myspace.com/inde...mageID=3600026

I hope this picture comes out and if not maybe the link will work. Sorry everyone I'm not to good with posting pictures.

ratpackv8sonly · 04-06-2008, 11:14 PM

Sorry it came out as a link. But if you go through thoes pictures you will see the tank in the frame befor I put the bed back on.

jeffspower · 04-07-2008, 09:04 PM

Here's some crummy pics. My body lift made it easier. I don't have the filler done yet- it's just a hose in the wheelwell so far. It looks like the tank would have to go further forward yet to clear the bed crossmember. On another note, I'm running 56" rear springs, so my rear spring hangers are further back.

ratpackv8sonly · 04-07-2008, 09:20 PM

Here are a few pictures of mine.

You can see here where I had to remove the floor brace from my bed.

The gas door from an 80s model chevy thats on the inside fender well.

04-06-2008, 06:29 AM	#1
Jerblazer72 Registered User Join Date: Aug 2007 Location: Kaysville, Utah Posts: 119	A couple questions on a rear tank install on 72 fleetside lwb Guys, a little help if possible. I am doing a blazer tank install on my 72 gmc lwb and just want to be sure of a couple things before I take the cutting tools to the underside of my truck. In the picture I have 2 arrows. The top points to what is the bottom support of the bed, I think it has to be removed. Am I correct? Also, the bottom arrow points to what I think is the spare tire mounting bracket. I think it has to come out also. Can someone confirm that I am on the right track here? I am planning on doing the rear marker light install once the tank is installed. Thanks in advance for your comments and insight! Attached Images

04-06-2008, 07:34 AM	#2
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	Re: A couple questions on a rear tank install on 72 fleetside lwb I'll be watching this, cause I'm planning on the same for my 72 GMC lwb. __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up

04-06-2008, 05:03 PM	#3
jayharrell Gettin By on Gettin By Join Date: Jan 2008 Location: Cedar Creek, Tx Posts: 1,033	Re: A couple questions on a rear tank install on 72 fleetside lwb This i want to see too. Plan on getting mine in pretty soon. Now i know the spare tire braket has to come out, and my tank is out of a suburban, so the rear cross member has to be moved back about 4 inches. This i would like to see too.

04-06-2008, 05:11 PM	#4
whatnow123 Registered User Join Date: Oct 2006 Location: Arizona Posts: 835	Re: A couple questions on a rear tank install on 72 fleetside lwb Yes, you are correct, both need to come out. Here is a photo of my tank so you get an idea on how it sits. There are more photos on my build thread link below. Attached Images __________________ 67 Short Step, 355, 700R 4.11 posi rear, 4/6 drop Discs on all 4 corners. Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=219094

04-06-2008, 07:36 PM	#5
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: A couple questions on a rear tank install on 72 fleetside lwb It looks like you have leaf springs- is it a 4x4? If so, you don't have to hack the whole box crossmember out. Just position the tank forward so the filler ends up in front of it. I'm working on mine today- I'll post pics later. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

04-06-2008, 07:46 PM	#6
chevelle instagram "footbraker67" Join Date: Apr 2007 Location: Mustang,Oklahoma Posts: 204	Re: A couple questions on a rear tank install on 72 fleetside lwb Ive got one of these tanks in my longbed and yes you have to remove the smaller lower brace, and I just trimmed the bed support for more clearance because mine is lowered, but i dont think you have to __________________ 1967 lwb, bigwindow, factory air (converted to Vintage Air), custom option,4.5- 6 drop, TBI injected 355, 700r4, 5 lug, daily driver. 1967 Chevelle Malibu Drag car, 355, brodix heads and intake, powerglide, 10.82 @ 123 mph 1966 chevelle malibu, Street/strip, 355, spare parts from my other chevelle, 12.82 @104 mph 1968 lwb parts truck

04-06-2008, 09:08 PM	#7
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: A couple questions on a rear tank install on 72 fleetside lwb You will need to notch the bed cross sill just between the frame rails so the fill neck gets above the frame rail. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

04-06-2008, 10:46 PM	#8
jayharrell Gettin By on Gettin By Join Date: Jan 2008 Location: Cedar Creek, Tx Posts: 1,033	Re: A couple questions on a rear tank install on 72 fleetside lwb Now is the notching of the bed support for top clearance of the tank or just for the filler neck?? Last edited by jayharrell; 04-06-2008 at 10:49 PM. Reason: changed my response completly

04-06-2008, 11:08 PM	#9
ratpackv8sonly Registered User Join Date: Mar 2008 Location: Las Cruces New Mexico Posts: 214	Re: A couple questions on a rear tank install on 72 fleetside lwb I know on my short bed I didnt have to do anything to the frame to fit my suburban tank but I did have to remove a brace from the bottom of the bed floor so the bed would sit all the way down on the frame. This floor brace landed right on top of the middle of my tank. I have my neck going into the inside fender well with a gas door from an early 80s model chevy. I will post a few pics as soon as I can.

04-06-2008, 11:12 PM	#10
ratpackv8sonly Registered User Join Date: Mar 2008 Location: Las Cruces New Mexico Posts: 214	Re: A couple questions on a rear tank install on 72 fleetside lwb http://viewmorepics.myspace.com/inde...mageID=3600026 I hope this picture comes out and if not maybe the link will work. Sorry everyone I'm not to good with posting pictures.

04-06-2008, 11:14 PM	#11
ratpackv8sonly Registered User Join Date: Mar 2008 Location: Las Cruces New Mexico Posts: 214	Re: A couple questions on a rear tank install on 72 fleetside lwb Sorry it came out as a link. But if you go through thoes pictures you will see the tank in the frame befor I put the bed back on.

04-07-2008, 09:04 PM	#12
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: A couple questions on a rear tank install on 72 fleetside lwb Here's some crummy pics. My body lift made it easier. I don't have the filler done yet- it's just a hose in the wheelwell so far. It looks like the tank would have to go further forward yet to clear the bed crossmember. On another note, I'm running 56" rear springs, so my rear spring hangers are further back. Attached Images __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

04-07-2008, 09:20 PM	#13
ratpackv8sonly Registered User Join Date: Mar 2008 Location: Las Cruces New Mexico Posts: 214	Re: A couple questions on a rear tank install on 72 fleetside lwb Here are a few pictures of mine. You can see here where I had to remove the floor brace from my bed. The gas door from an 80s model chevy thats on the inside fender well.



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