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#1 |
Registered User
Join Date: Nov 2014
Location: Austin, TX
Posts: 281
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Best replacement behind-the-seat fuel tank
The PO of my '72 K2500 removed the behind-the-seat tank and put in plastic saddle tanks.
I'm replacing the bed, and rather than cut holes in the nice sides for the fuel filler, I'm planning on putting a tank back in behind the seat. The filler cap/neck are still in place (just not attached to anything). So, new reproduction or used tank? Who sells the best reproduction tank? What should I look for/avoid in a used tank? What's the best method for ensuring a long tank life (pour-in tank liner?) I only plan on doing this once, so I want to do it right.
__________________
72 K2500 Sierra Longbed Wideside 350/TH350/NP205 66 Plymouth Barracuda 225 Slant6 |
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#2 |
Registered User
Join Date: Sep 2003
Location: Sandy, UT
Posts: 11
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Re: Best replacement behind-the-seat fuel tank
My tank cracked so I replaced it with an aftermarket tank. Unfortunately I don't remember where I bought it. It's been too long. However, it did not fit well. The fill neck wasn't centered with the hole in the cab, and it was at a slightly different angle than stock. The tank was also bigger so it didn't allow the seat to move back all the way. I was able to make it work, but it wasn't ideal. I would recommend looking for a good, used OEM tank. They pop up fairly regularly around here.
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#3 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
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Re: Best replacement behind-the-seat fuel tank
Spectra is a good brand and you can get them shipped from Rock Auto. I have used them several times no issues at all.
Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time |
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#4 |
Registered User
Join Date: Oct 2016
Location: Gainesville, Tx
Posts: 30
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Re: Best replacement behind-the-seat fuel tank
I got a new tank for my 72 C10 from LMC and it fits perfect and wasn't hard to install. Tank and sending unit were around $200. I was able to pick it up in KC and didn't have to pay shipping, tho. Oversized freight charges can be wretched.
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#5 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,200
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Re: Best replacement behind-the-seat fuel tank
I also bought one from LMC. The filler pipe wasn't centered in the cab hole but it was no problem inserting a pipe in the filler neck and move it to center.
__________________
Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#6 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,683
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Re: Best replacement behind-the-seat fuel tank
I am pleased with the one I got from Classic Industries. I picked the tank and wrote to their tech support to ask them what else they suggested I buy to make it a complete deal with everything correct and matching. They suggested a gas cap, grommet, and sending unit to make it complete.
The bottom lip of the tank was straight and needed to be bent to fit the contour of the floor where it bolts. The neck was not perfectly centered, but was easy to bend into position. The part numbers were: ST10491 6428361 FT5002A 3886792 |
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#7 |
Registered User
Join Date: Jun 2016
Location: Phoenix AZ
Posts: 429
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Re: Best replacement behind-the-seat fuel tank
What if you kept the tanks you have and put the fuel cap/filler hole through the wood bed.
There is also this option. http://67-72chevytrucks.com/vboard/s...ad.php?t=77104 Last edited by prodjay10; 11-02-2016 at 10:33 PM. |
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#8 |
Registered User
Join Date: Nov 2014
Location: Austin, TX
Posts: 281
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Re: Best replacement behind-the-seat fuel tank
The bed is steel. And the current tanks don't have a provision for the fuel gauge.
__________________
72 K2500 Sierra Longbed Wideside 350/TH350/NP205 66 Plymouth Barracuda 225 Slant6 |
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#9 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: Best replacement behind-the-seat fuel tank
My favorite approach is the somewhat hidden filler necks for saddle tanks that only protrude into the wheel well. An option if you can find them. I've squirreled away two from old projects for future use. They are out there, it's amazing how many of these trucks had add-on tanks. Most were, unfortunately, with the bedside filler cut, but some are not. Just another option.
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#10 |
Registered User
Join Date: Nov 2015
Location: Canton, GA
Posts: 17
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Re: Best replacement behind-the-seat fuel tank
Bought one from Rockauto, had the same problem and did the same thing. Great otherwise. Haven't had a problem yet.
__________________
1972 Chevrolet C10 LWB |
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#11 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Best replacement behind-the-seat fuel tank
Universal, GM gauge compatible, sending units are easy to come by
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#12 |
Registered User
Join Date: Jan 2015
Location: Ventura, CA
Posts: 818
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Re: Best replacement behind-the-seat fuel tank
I got mine from LMC about 3 weeks ago. Worked out good. Filler tube had to be massaged a little, but overall I'm happy. My opinion, if your getting a new tank, get a sending unit and little stuff like new cap. Go in there one time.
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..................... ____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1970 C20 -_--_--_- ______ _--_--_- /___|__\____ -_--_-_ |_(0)|__|_(0)] 1972 K5 |
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#13 |
Registered User
![]() Join Date: Jul 2014
Location: Lakewood, Colorado
Posts: 90
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Re: Best replacement behind-the-seat fuel tank
Got mine from Wes at Classic Heartbeat. No issues with the install whatsoever. Got a bad float on the new sending unit so I just tossed my old one back in.
__________________
Chevy Runs Deep. 1956 210 LS1 TH350 3.31 Posi 12 Bolt 1969 Z/28 5.3 T56 3.73 Posi 12 Bolt 1973 Nova SS 355 TH350 2.73 Posi 12 Bolt 2000 K2500 Suburban LS 6.0 4L80 3.73 G80 2005 K2500HD CCSB LS 6.0 4L80 4.10 G80 2010 2SS/RS Camaro LS3 T56 Aqua Blue Metallic |
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#14 |
Registered User
![]() Join Date: Nov 2013
Location: Winnipeg, Mb
Posts: 1,115
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Re: Best replacement behind-the-seat fuel tank
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#15 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
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Re: Best replacement behind-the-seat fuel tank
__________________
71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time |
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#16 |
Senior Member
![]() Join Date: Aug 2005
Location: Los Angeles
Posts: 1,327
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Re: Best replacement behind-the-seat fuel tank
Have a Canadian made Spectra in my truck. No issues at all.
__________________
1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90. |
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#17 |
Registered User
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,746
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Re: Best replacement behind-the-seat fuel tank
Same here.
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Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100 |
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#18 |
Registered User
Join Date: Apr 2016
Location: Rural Wa
Posts: 3
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Re: Best replacement behind-the-seat fuel tank
Hey all, I went through THREE Summit Racing fuel tanks, all with the filler neck angle way off for it sticking through the cab. ...Returned them.
I now have a Spectra tank ordered for my '68 C30 flatbed through Rock Auto. Rock Auto does not carry sending units for it, nor can I get through on the phone with them. Rock Auto kinda sucks (had previous issues with them also on a Nissan truck). I ordered a sending unit through Summit. My rotted and rinsed stock tank still releases rust into my fuel line & plugs the filter & pretty much destroyed a recent rebuilt stock carb. My search for info landed me here on this thread. ![]() Reproduction anything is very poor these days. ![]() |
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#19 |
Registered User
Join Date: Jan 2009
Location: South Carolina
Posts: 262
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Re: Best replacement behind-the-seat fuel tank
Also bought my tank from LMC . Filler neck wasn't centered . Was worried I might break something trying to bend the filler neck , so I took the tank back out and enlarged the tank mounting holes . Wish I'd known others had bent the filler neck with no problem . Good info .
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